While heating copper in the final step, the bright copper color changes to dull brown. Will percent recovery be too high, too low, or unaffected? Explain your answer

Answers

Answer 1
Copper is an element in the periodic table with the chemical symbol Cu and atomic number which is equal to 29. This is a metallic element that is soft, ductile, and malleable. Also, this has very high electrical and thermal conductivity. 

This metal, when freshly exposed is a reddish-orange color. The situation given above, it is described that copper has already reacted with oxygen, as described by the change of color. This means that the percent recovery of the metal will be less since portion of it has already reacted. 

Related Questions

. Which list is organized from smallest to largestA. Planet, Galaxy, Solar System, UniverseB. Solar System, Planet, Universe, GalaxyC. Universe, Solar System, Planet, GalaxyD. Planet, Solar System, Galaxy, Universe

Answers

The answer is D because the order of l to g is Planet, Solar System, Galaxy and then Universe

Answer:

D

Explanation:

Planet, Solar System Galaxy and Universe

Where do scientists think the abundance of water on Earth came from?

Answers

ice, and glaciers melting and adding water to the oceans

Which of the following elements is very reactive and needs to gain one electron to have a full outermost shell?

Cesium
Zinc
Iodine
Xenon

Answers

Iodine has 7 valence electrons. It needs therefore only 1 electron to be stable this is why it is so reactive.

Answer:   Iodine

Explanation:  Cesium is the alkali metal which belongs to the group 1 of the periodic table.

Iodine is the Group 17 element which are known as the Halogens as they are the group of the most electronegative atoms.

Zinc belongs to the Transition metal d block .

Xenon belongs to the Group 18 of noble gases.

The electronic configuration will help us to determine which can gain electron to have a full outermost shell.

Cesium (Cs) = [Xe] 6s1

Zinc (Zn) = [Ar] 3d10 4s2

Iodine(I) =  [Kr] 4d10 5s2 5p5

Xenon (Xe) = Kr 4d10 5s2 5p6

Thus Iodine can easily gain one electron to have complete outermost shell.

Part b which of the isoelectronic pairs you determined above has the same electron configuration?

Answers

The answer would be
C1-and Ar
Sc3+and Ar

Sn4+and Pd
Final answer:

Isoelectronic pairs consist of atoms and ions with identical electron configurations. Examples include the pairs N³, 0²-, F¯, Ne, Na+, Mg²+, and Al³+ (1s²2s²2p6) and P³-, S²-, Cl-, Ar, K+, Ca²+, and Sc³+ ([Ne]3s²3p6). Understanding atomic structure and electron distribution is key to understanding chemical bonding and molecular formation.

Explanation:

Isoelectronic pairs are atoms and ions that have the same electron configuration. For example, N³, 0²-, F¯, Ne, Na+, Mg²+, and Al³+ (1s²2s²2p6) are all isoelectronic because they share the same configuration. Another isoelectronic series is P³-, S²-, Cl-, Ar, K+, Ca²+, and Sc³+ ([Ne]3s²3p6).

Methods to understand and predict how atoms will combine to form molecules is through the electron-pair geometry and molecular structure. For instance, carbon (atomic number 6) has six electrons, filling the 1s and 2s orbitals, with the remaining two occupying the 2p subshell. According to Hund's rule, the lowest-energy configuration for an atom with electrons within a set of degenerate orbitals is that having the maximum number of unpaired electrons.

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What is the enthalpy change (in kj) for burning 18.0 g of methyl alcohol?

Answers

Final answer:

To calculate the enthalpy change for burning 18.0 g of methyl alcohol, use stoichiometry and the balanced chemical equation for the combustion of methyl alcohol. Convert the mass of methyl alcohol to moles and then use the mole ratio from the balanced equation to determine the moles of products. Finally, multiply the moles of products by the enthalpy change per mole to find the enthalpy change in kilojoules.

Explanation:

The enthalpy change for burning 18.0 g of methyl alcohol can be calculated using stoichiometry. First, convert the mass of methyl alcohol to moles by dividing by its molar mass. Then, use the balanced chemical equation for the combustion of methyl alcohol to determine the ratio of moles of methyl alcohol to moles of products. Finally, multiply the moles of methyl alcohol by the enthalpy change per mole to find the enthalpy change in kilojoules.

For example, the balanced equation for the combustion of methyl alcohol is: 2CH3OH + 3O2 -> 2CO2 + 4H2O

The enthalpy change for this reaction is -726 kJ per mole of methyl alcohol. Therefore, to find the enthalpy change for burning 18.0 g of methyl alcohol, you would follow these steps:

Calculate the number of moles of methyl alcohol.Use the mole ratio from the balanced equation to determine the number of moles of products.Multiply the moles of products by the enthalpy change per mole to find the enthalpy change in kilojoules.

Sodium-24 has a half life of 14.8 hours how much of a 260.1mg sodium -24 sample will remain after 3.7days?

Answers

after 3.7 days, approximately [tex]\( 4.064 \text{ mg} \)[/tex] of the sodium-24 sample will remain.

To solve this problem, we can use the formula for radioactive decay:

[tex]\[ N_t = N_0 \left( \frac{1}{2} \right)^{\frac{t}{T_{1/2}}} \][/tex]

Where:

-[tex]\( N_t \)[/tex] is the final amount of the substance after time \( t \)

- [tex]\( N_0 \)[/tex] is the initial amount of the substance

- ( t ) is the time that has passed

- [tex]\( T_{1/2} \)[/tex] is the half-life of the substance

Given:

- Initial amount of sodium-24 [tex](\( N_0 \))[/tex] = 260.1 mg

- Half-life of sodium-24 ([tex]\( T_{1/2} \)[/tex]) = 14.8 hours

- Time that has passed [tex](\( t \))[/tex] = 3.7 days

First, let's convert the time that has passed from days to hours:

[tex]\[ 3.7 \text{ days} \times 24 \text{ hours/day} = 88.8 \text{ hours} \][/tex]

Now, we can substitute the given values into the formula for radioactive decay to find [tex]\( N_t \)[/tex], the amount of sodium-24 remaining after 3.7 days:

[tex]\[ N_t = 260.1 \text{ mg} \times \left( \frac{1}{2} \right)^{\frac{88.8 \text{ hours}}{14.8 \text{ hours}}} \][/tex]

Now, let's calculate:

[tex]\[ N_t = 260.1 \text{ mg} \times \left( \frac{1}{2} \right)^{\frac{88.8}{14.8}} \][/tex]

[tex]\[ N_t = 260.1 \text{ mg} \times \left( \frac{1}{2} \right)^{6} \][/tex]

Since [tex]\( \left( \frac{1}{2} \right)^6 = \frac{1}{64} \),[/tex] we have:

[tex]\[ N_t = 260.1 \text{ mg} \times \frac{1}{64} \][/tex]

[tex]\[ N_t = \frac{260.1}{64} \text{ mg} \][/tex]

[tex]\[ N_t \approx 4.064 \text{ mg} \][/tex]

So, after 3.7 days, approximately [tex]\( 4.064 \text{ mg} \)[/tex] of the sodium-24 sample will remain.

Complete this sentence. If volume remains the same while the mass of a substance ________, the density of the substance will_______________.

Answers

it both increase ,,,,,,,,,,,,,,

Answer:

If volume remains the same while the mass of a substance increases, the density of the substance will increase.

Explanation:

Mathematically D = m/V tells us that density is directly proportional to the mass and inversely proportional to volume. Therefore if the mass increases the density will also increase.

Analytically, density is mass per unit of volume. So if you had 500 kg of mass packed in a one cubic meter box, clearly your density would 500 kg per cubic meter. Now if you added another 500 kg of mass in that same box(volume unchanged) the density goes up to 1000 kg per cubic meter. So If volume remains the same while the mass of a substance increases, the density of the substance will increase.

What do you use to measure water?

Answers

You use a graduated cylinder to measure water. 

what is the role of rRNA during translation

Answers

Final answer:

Ribosomal RNA (rRNA) is crucial for aligning mRNA and ribosomes during protein synthesis and catalyzing the formation of peptide bonds between amino acids. It is a key component of the ribosome, which directs the assembly of protein molecules. Transfer RNA (tRNA) assists by delivering the correct amino acids for incorporation into the protein.

Explanation:

Role of Ribosomal RNA (rRNA) during Translation

Ribosomal RNA (rRNA) plays a critical role during the process of translation, which is the synthesis of proteins in the cells. rRNA is a major component of ribosomes, which are the cellular structures where translation occurs. The rRNA ensures the correct alignment of mRNA and the ribosomes, which is essential for the decoding of the mRNA sequence into a polypeptide chain. Furthermore, rRNA has enzymatic activity and catalyzes the formation of peptide bonds between aligned amino acids, which is a pivotal step in the creation of a protein.

Transfer RNA (tRNA) also contributes to translation by carrying the appropriate amino acid to the ribosome, determined by its anticodon's base pairing with the corresponding codon on the mRNA. Each tRNA carries a specific amino acid that gets added to the growing polypeptide chain, thus translating the genetic code into a functional protein.

Final answer:

Ribosomal RNA (rRNA) is integral to protein synthesis during translation, aligning mRNA and ribosomes and catalyzing peptide bond formation. It works in conjunction with transfer RNA (tRNA), which brings amino acids to the ribosome.

Explanation:

The role of ribosomal RNA (rRNA) during translation is crucial to protein synthesis. rRNA constitutes a major part of ribosomes, which are the molecular machines that synthesize proteins. It ensures the proper alignment of mRNA and ribosomes, facilitating the reading of genetic information found on the mRNA. Moreover, rRNA has an enzymatic activity and catalyzes the formation of peptide bonds between aligned amino acids, incrementally building the polypeptide chain that will make up the protein.

Transfer RNA (tRNA) complements the process by carrying amino acids to the ribosome, matching them with the appropriate codons on the mRNA. The interactions between tRNA and mRNA are mediated by the rRNA, ensuring that each amino acid is correctly added in sequence to the growing polypeptide chain.

While rRNA and tRNA are essential for translation, they differ in their functions; rRNA primarily acts as a structural and catalytic component of the ribosome, whereas tRNA serves as a transport molecule that brings specific amino acids to the correct location.

Which of these substances, when dissolved in water, is a strong electrolyte? which of these substances, when dissolved in water, is a strong electrolyte? sucrose folic acid sodium nitrate ammonia hydrofluoric acid?

Answers

Option C. It is sodium nitrate because it is a strong electrolyte that comes from a strong acid (HNO3) and a strong base (KOH). It becomes a strong electrolyte when it dissolves in water, its formula is NaNO3, which is a compound that forms nitrate together with potassium nitrate and is obtained by chemical synthesis.

Based on its products when it is dissolved in water, the substance that is a strong electrolyte is Sodium Nitrate.

Why is Sodium Nitrate a strong electrolyte?

An electrolyte refers to a substance that has ions. When Sodium Nitrate is dissolved in water, it leads to Hydrochloric acid being formed.

Hydrochloric acid is a strong acid which means that it is full of ions. Sodium Nitrate can therefore be said to be a strong electrolyte.

In conclusion, option C is correct.

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CHEMISTRY. PLEASE HELP!!
Which statement about delta Hf is true?
A.) It is zero for any compound in its standard state.
B.) It is positive when the bonds of the product store more energy than those of the
reactants.
C.) It is negative when a compound forms from elements in their standard states.
D.) It is zero for any element that is in the liquid state.

Answers

Enthalpy of a reaction is calculated by substracting the total enthalpy of reactant from the total enthalpy of product. Enthalpy of reactant can be positive or negative.  The correct option is option B.

What is Enthalpy?

Enthalpy term is basically used in thermodynamics to show the overall energy that a matter have. Mathematically, Enthalpy is directly proportional to specific heat capacity of a substance.

If the enthalpy of a reaction is positive then that reaction is called endothermic reaction and the reaction in which enthalpy is negative then that reaction is called exothermic reaction. when the bonds of the product store more energy than those of the reactant then the  enthalpy is positive.

Therefore the correct option is option B that is enthalpy is positive when the bonds of the product store more energy than those of the

reactants.

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Thin, flattened, and typically curved bones, such as the ribs and sternum, form __________ bones.

Answers

Thin, flattened, and typically curved bones, such as the ribs or sternum, form falt bones.

The two main functions of flat bones are protection or provide a large surface for musular attachment.

These are the flat bones of the human body: in the skull, parietal, frontal, occipial, lacrimal, nasal and vomer; scapula; sternum; rib and hip.

Flat bones is the answer

Which equation shows the relationship between the Kelvin and Celsius temperature scales?

A. K = °C +°F

B. K = °C + 273

C. K = °F + 273

D. K = 273 –°C

Answers

The answer is B.) K=C+273C. This is the correct answer because at 0K, the temperature is also -273C. This is a linear relationship so no multiplication is needed.

Which resonance forms of silicon dioxide contribute the most to the actual bonding?

Answers

Final answer:

The most significant resonance forms of silicon dioxide are those depicting silicon atoms tetrahedrally coordinated to four oxygen atoms with single Si-O bonds, forming a three-dimensional network. Silicon's lower tendency to form pi bonds compared to carbon leads to a covalent network solid structure, differing greatly from the molecular structure of CO2.

Explanation:

The question asks which resonance forms of silicon dioxide (SiO₂) contribute the most to the actual bonding in the substance. In the case of SiO₂, resonance forms with discrete silicon-oxygen double bonds are not favored due to silicon's tendency to form a three-dimensional network structure, where each silicon atom is tetrahedrally coordinated, forming four Si-O single bonds. This contrasts with carbon dioxide (CO₂), which forms strong double bonds due to carbon's ability to form π bonds effectively.

Silicon has an electron configuration of 3s²3p², which encourages sp³ hybridization and results in SiO₂ manifesting as a covalent network solid, where the SiO₄ tetrahedra share oxygen atoms in a continuous lattice. This structure is significantly different from that of molecular CO₂, which consists of discrete molecules held together by weak intermolecular forces. Therefore, the most representative forms of SiO₂ in terms of actual bonding would be those illustrating single Si-O bonds forming an extended network.

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Determine the element of lowest atomic number that contains ten total p electrons in the ground state.

Answers

Final answer:

The first element that has exactly ten p electrons is Neon. However, the first element to have 10 p-electrons in the ground state (including core electrons) is Silicon.

Explanation:

The element of lowest atomic number that has exactly ten p electrons is neon. This is because the periodic table allows us to understand the electron configuration of elements. In the case of Neon (atomic number 10), it fills the 1s, 2s, and 2p orbitals; the 1s and 2s orbitals can hold two electrons each while the 2p can hold six, all for a total of 10 electrons, with the last six being p electrons.

However, if we're seeking the first element to have 10 p electrons in its ground state (including those beyond the Neon atom), the element would be Silicon (atomic number 14). Its electron configuration is [Ne]3s²3p², meaning it has 10 total p-electrons in the ground state: six from the Neon core and four more in the next energy level.

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match the following:

A) osteoclasts
B) osteoblasts
D) osteocytes
E) epiphyseal line
F) epiphyseal plate
J) osteons

66) Cells that can dissolve the bony matrix

67) Layers of calcification that are found in bone

68) Cells that can build bony matrix

69) Area where bone growth takes place

Match the following:

A) saddle joint
B) hinge joint
C) plane joint
D) ball-and-socket joint
E) condylar joint
F) pivot joint

70) Wrist joint

71) Shoulder joint

72) Elbow joint

73) Knuckle joints

74) Joint between atlas and axis




Match the following:

A) short bone
B) irregular bone
C) flat bone
D) long bone

75) Tarsals

76) Femur

77) Phalanges

78) Ulna

79) Atlas

80) Sternum

81) Fibula

82) True ribs

83) Parietal bones

Answers

The answers are as follows:
66) Cells that can dissolve the bony matrix are called OSTEOCLASTS.
Osteoclasts are very large motile cells which have multiple nucleus. They are formed from the fusion of bone marrow derived cells. Their principal function is to dissolve the bony matrix through the process called osteolysis. They also participates in regulation of calcium and phosphate concentrations in the body fluids.
67) Layers of calcification that are found in bone is called OSTEONS.
The basic unit of a compact bone is osteon. An osteon contains lamellae, osteocytes and a central canal and is found in compact bone only. The blood vessels and the nerve fibers are located in the central canal. The layers of calcification that are found in compact bone are also called lamellae.

68) Cells that can build bony matrix are called OSTEOBLASTS.
Osteoblasts are bone forming cells, they produce new bone matrix by the process of osteogenesis. Osteoblasts are located exclusively on the surface of the bone matrix where they function in matrix synthesis. The activities of the osteoblast are stimulated by the influence of parathyroid hormone.
69) Area where bone growth takes place is called EPIPHYSEAL PLATE.
The epiphyseal plate is a hyaline cartilage plate which is located on the surface of every long bone. It is the area of growth in a long bone.


70) Wrist joint: is an example of PLANE JOINT.

Plane joint is a type of joint in which bones slide along beside one another, thus allowing for movement in many directions. This makes the body parts with plane joints to be flexible. This type of joint is also called gliding joint.

71) Shoulder joint: is an example of BALL AND SOCKET JOINT.

Ball and socket joint is a type of joint in which the ball shaped surface of a rounded bone is fitted into a depression of another bone. This type of joint allows for movement of the bone around all axes. That is, the joint can rotate in a full circle and move around its axis. Ball and socket joint is also found in the hips.

72) Elbow joint: is an example of HINGE JOINT.

Hinge joints allow swinging movement of the bones; the joint allows bones to either move toward one another or to spread apart. Hinge joint is also found in the ankles, fingers, toes and knees.

73) Knuckle joints: is an example of CONDYLOID JOINT.

A condyloid joint is a type of joint which allows for movement in two planes, allowing for flexion, abduction, adduction, extension and circumduction. This joint usually forms where the head of one bone fits in the elliptical cavity of another bone. It is similar to ball and socket joint but does not allow a bone to rotate inside the joint.

74) Joint between atlas and axis: is an example of PIVOT JOINT.

Pivot joint is a type of joint which allows rotational movement of bones. This type of joint is found in the neck vertebrae. The joint is also called rotatory joint.  

A) Short bone: refers to those bones which are as wide as they are long. The principal function of short bone is to provide support and stability with little or no movement. In the question given, the bone in number 75 [tarsals] is a short bone.
B) Irregular bone: irregular bones are multipurpose in function; their functions include protection, provision of multiple anchor points for skeletal muscle attachments and maintenance of attachments. The bone given in number 79 is an irregular bone. The atlas is a vertebra which protects the spinal cord.
C) Flat bone: The major role of flat bones is to provide extensive protection or to provide a broad surface which can be used for muscular attachments. They are usually flat and broad in form. Examples of this type of bone are cranium, ilium, sternum and the rib cage. The bone given in number 80 and 82 are flat bones.
D) Long bone: long bones are usually hard and dense, with a shaft and two heads. Their major role is provision of strength, structure and mobility. The bones in number 76, 77, 78 and 81 are all examples of long bones.


For the first set:

66) Cells that can dissolve the bony matrix - A) osteo-clasts

67) Layers of calcification that are found in bone - J) oste-ons

68) Cells that can build bony matrix - B) osteoblasts

69) Area where bone growth takes place - F) epiphyseal plate

For the second set:

70) Wrist joint - C) plane joint

71) Shoulder joint - D) ball-and-socket joint

72) Elbow joint - B) hin-ge joint

73) Knu-ckle joints - E) condylar joint

74) Joint between atlas and axis - F) pivot joint

For the third set:

75) Tarsals - A) short bone

76) Femur - D) long bone

77) Pha-lan-ges - D) long bone

78) Ul-na - D) long bone

79) Atlas - B) irregular bone

80) Sternum - C) flat bone

81) Fibula - D) long bone

82) True ribs - B) irregular bone

83) Parietal bones - B) irregular bone

In the first set of matches, osteoclasts are specialized cells responsible for dissolving the bony matrix during bone remodeling. Oste-ons are structural units within compact bone that consist of concentric layers of calcified tissue. Osteo-blasts are cells that build new bony matrix, contributing to bone formation. The epiphyseal plate is an area located at the ends of long bones where bone growth occurs.

In the second set, various joint types are matched with specific examples. For instance, a wrist joint is a plane joint, the shoulder joint is a ball-and-socket joint, the elbow joint is a hin-ge joint, knuckle joints are condylar joints, and the joint between the atlas and axis (the first and second cervical verte-brae) is a pivot joint.

The third set matches bone types to specific examples of those bones, highlighting their various shapes and functions in the skeletal system.

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Elements in the same group/family of the periodic table are similar in what way?

Answers

Elements in the same group in the periodic table have similar chemical properties. This is because their atoms have the same number of electrons in the highest occupied energy level. Group 1 elements are reactive metals called the alkali metals.Group 0 elements are unreactive non-metals called the noble gases.

Answer:

they have the same valance electrons

Explanation:

80 grams of iron (III) oxide and 54 grams of aluminum react to form an elemental iron and aluminum oxide. In the lab you only manage to get 75% yield.
a. How many grams of the non limiting reagent remains?
b. How many grams of the limiting reagent remains?
c. How many in grams of an elemental iron is formed?

Answers

a) 34 grams Al remains b) 20 grams Fe2O3 remains c) 42 grams Fe produced Iron(III) oxide is Fe2O3, so the balanced reaction is Fe2O3 + 2Al ==> Al2O3 + 2Fe Now, calculate the molar masses of the involved elements and compounds Atomic weight iron = 55.845 g/mol Atomic weight Aluminum = 26.981539 g/mol Atomic weight oxygen = 15.999 g/mol Molar mass Fe2O3 = 2 * 55.845 + 3 * 15.999 = 159.687 g/mol Now determine how many moles of each reactant you have. Moles Fe2O3 = 80 g / 159.687 g/mol = 0.500980042 mol Moles Al = 54 g / 26.981539 g/mol = 2.001368417 mol Since you need only 2 moles of Al per mole of Fe2O3, the limiting reactant is Fe2O3. So for every mole of Fe2O3 used, we get 2 moles of iron, so the mass of iron produced with 100% yield is double the moles of Fe2O3 multiplied by the atomic weight of iron, so: 0.500980042 mol * 2 * 55.845 g/mol = 55.95446089 g Additionally, for every mole of Fe2O3 consumed, 2 moles of Al are consumed. So the mass of consumed Al is 0.500980042 mol * 2 * 26.981539 g/mol = 27.03442508 g a. Since we only had 75% yield, only 75% of the calculated aluminum is consumed, so 54 g - 0.75 * 27.034425 = 33.72418125 Rounded to 2 significant figures gives 34g b. Since we only had 75% yield, we're left with 25% of the Fe2O3 which is 0.25 * 80 g = 20 g c. And we only get 75% of the iron, so 55.95446089 g * 0.75 = 41.96584567, rounded to 2 figures gives 42 grams

What is responsible for the formation of a solution?

Answers

An aqueous solution is produced when a solute dissolves in water. The biggest responsible is the water that is the solvent of substances in smaller proportion as some ions of K +, Na +, Cl -, forming true solutions. Occurs when a solute dissolves in the water solvent, the separation between the substances is atomic, molecular or ionic, depending on the solution.

Aluminum metal reacts with nitric acid to produce aluminum nitrate and hydrogen gas. identify the balanced reaction that describes this process.

Answers

2Al + 6HNOâ‚ 2Al → 2Al(NOâ‚)â‚ + 3Hâ‚‚ When writing a balanced equation write out a balanced equation think of the least amount of moles in the most complex compound, then after that you can fill in the amount of moles of the other compounds as you go.
Final answer:

The balanced equation for the reaction between aluminum and nitric acid is: 2Al(s) + 6HNO3(aq) → 2Al(NO3)3(aq) + 3H2(g). This represents the formation of aluminum nitrate and hydrogen gas from aluminum and nitric acid.

Explanation:

The chemical reaction where aluminum metal reacts with nitric acid to produce aluminum nitrate and hydrogen gas can be written and balanced as follows:

2Al(s) + 6HNO3(aq) → 2Al(NO3)3(aq) + 3H2(g)

Here, Al stands for Aluminum, H for Hydrogen, N for Nitrogen, and O for Oxygen. The symbols (s), (aq), and (g) designate the physical states solid, aqueous (in water), and gas, respectively. Nitric acid, HNO3, reacts with aluminum, Al, to form aluminum nitrate, Al(NO3)3, and hydrogen gas, H2.

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HELP PLEASE ASAP (3 QUESTIONS)WILL BRAINLIEST!

Which ability do all organism have?


A.
quick escape from predators


B.
changing shape to blend into their surroundings


C.
consuming other organisms


D.
reproduction

Which characteristic makes the Venus Flytrap different from most other green plants?


A.
It can digest insects.


B.
It grows very slowly.


C.
It survives without much water.


D.
It lives off the roots of a tree.

Why does a giant kelp have gas-filled sacs to help it float?


A.
to move with the ocean waves


B.
to trap small fish


C.
to send signals to other plants


D.
to collect more sunlight

Answers

D. Reproduction

A. It can digest insects


D. To collect more sunlight
number one would be D. Reproduction

number 2 It can digest insects


number 3 To collect more sunlight

C3H2N, 208.19 g/mol chemical formula?

Answers

First, determine the molar mass of the empirical formula given for the substance. This can be solved by adding the products of the number of moles and the molar mass of each of the atom as shown below,
 
         M = (3 mols C)(12 g C/1 mol C) + (2 mols H)(1 g H/1 mol H) + (1 mol N)(14 g N/1 mol N)
         M = 52 g/mol

Then, divide the given molar mass above by the calculated value.
       n = 208.19 g/mol / 52 g/mol = 4 

Then, multiply the value of n to the coefficients of the atoms giving us the answer.

 ANSWER: C₁₂H₈N₄

Melts in the system pb-sn exhibit regular solution behavior. at 473°c apb = 0.055 in a liquid solution of xpb = 0.1. calculate the value of w for the system and calculate the activity of sn in the liquid solution of xsn = 0.5 at 500°c

Answers

Given the temperature 746 K and activity of Pb equal to 0.055. The mole fraction of Pb is 0.1. So, the mole fraction of Sn = 0.9.Activity coefficient, γ = 0.055 / 0.1 = 0.55.The expression for w=ln⁡〖γ_Pb x RT〗/(X_Sn^2 )=(-0.5978 x 8.314 J/(mol K ) x 746 K)/(0.9 x 0.9)= -4577.7 J= -4578 J

Now we use the computed value above and new temperature 773 K. The mole fraction of Sn and Pb are 0.5 and 0.5 respectively. Calculate the activity coefficient in the following manner.lnγ_Sn=w/RT  X_Pb^2=(-4578 J)/(8.314 J/mol  x 773 K)  x 0.5 x 0.5= -0.718lnγ_Sn=exp⁡(-0.178)=0.386The activity of  Sn= γ_Sn  x X_Sn=0.386 x 0.5=0.418
w of the system is -4578 J and the activity of Sn in the liquid solution  of xsn at 500 degree Celsius is 0.418

What trend do you observe that distinguishes lone pairs from bonding domains?

Answers

Lone pair is a pair of valence electrons that are not shared with another atom. The pair is also called a non-bonding pair.
The thing that distinguishes lone pairs from bonding domains is the following: The bonding domains are bonded to the central atom while the lone pairs are just stuck on as extra electrons.
Final answer:

Lone pairs and bonding domains differ in the amount of space they occupy due to repulsion effects. Lone pairs occupy a larger area compared to bonding pairs, and are often positioned to minimize repulsions. This impacts the geometry of the molecule.

Explanation:

The trend that distinguishes lone pairs from bonding domains comes from the spatial arrangement of electrons. Due to repulsions, a lone pair of electrons tends to occupy a larger region of space compared to electrons in a bond. The repulsion order from the largest to smallest is: lone pairs > triple bond > double bond > single bond.

Consider a case where a central atom has two lone pairs and four bonding regions, which results in an octahedral electron-pair geometry. The lone pairs are positioned on opposite sides, leading to a square planar molecular structure. This placement minimizes lone pair-lone pair repulsions.

Space must be provided for each pair of electrons, whether they are in a bond or are lone pairs. This concept contributes to the formation of different molecular structures.

Learn more about Lone Pairs and Bonding Domains here:

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What's a controlled experiment

Answers

the answer is in the photoo
a control experiment is a test where the person conducting the test only changes one variable at a time in order to isolate the results. An experiment where all subjects involved in the experiment are treated exactly the same except for one deviation is an example of a control experiment.

In an aqueous solution, once all of the ions have attached themselves to the oppositely charged ends of the molecules of water, the compund is considered to be completely

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It is here, that due to the water molecules surrounding the oppositely charged ions completely preventing them from reaching their opposite positive or negative ions, that the ionic compound has dissolved.

You're writing the instruction manual for a power saw, and you have to specify the maximum permissible length for an extension cord made from 18-gauge copper wire (diameter 1.0 mm). the saw draws 9.0 a and needs a minimum of 115 v across its motor when the outlet supplies 120 v.

Answers

12.7 meters You want a maximum voltage drop of 5 volts while carrying a load of 9.0 amperes. So using ohms law I=V/R and solving for R, gives R=V/I. So R = 5/9 = 0.5556 ohms. The formula for the resistance of a conductor is R = pL/A where p = resistivity 1.72x10^-8 L = length A = cross sectional area Since the wire has a diameter of 1.0 mm, its radius is 0.5 mm. So the cross section is pi r^2 = pi 0.5^2 = pi 0.25 = 0.785398163 mm^2 We need to convert that cross section to square meters, so we divide by 1 million, giving a result of 7.85398163x10^-7 m^2 The resistivity of copper is 1.72x10^-8 Now substitute the known values into the formula and solve for L R = pL/A 0.5556 = 1.72x10^-8 * L / 7.85398163 x 10^-7 0.5556 * 7.85398163 x 10^-7 = 1.72x10^-8 * L 0.5556 * 7.85398163 x 10^-7 / 1.72x10^-8 = L 25.4 = L So the longest length of 18 gauge wire you can use is 25.4 meters. But you need to take into account that the current is flowing to the saw and back from the saw through the extension cord, so you need to divide that length by 2, giving 12.7 meters.

Final answer:

To find the maximum permissible length for an 18-gauge extension cord for use with a power saw, one must calculate the voltage drop the cord can tolerate (5 V) and use the ohmic resistance per length unit of an 18-gauge wire to maintain at least 115 V for the saw's operation. This involves applying Ohm's Law and wire resistance specifications.

Explanation:

Finding the Maximum Permissible Length for an 18-Gauge Extension Cord:

To determine the maximum permissible length for an 18-gauge (1.0 mm diameter) copper wire extension cord for a power saw that draws 9.0 A and requires a minimum of 115 V to operate efficiently when the outlet supplies 120 V, we need to calculate the allowable voltage drop and then translate that into a length given the specific characteristics of the wire.

Voltage Drop Calculation:

The power saw can tolerate a voltage drop of 5 V (from 120 V to 115 V). Using Ohm's Law (V = IR), where V is the voltage, I is the current, and R is the resistance, we can determine the maximum resistance of the cord allowed to ensure the voltage at the saw does not drop below 115 V. First, we calculate the maximum allowable voltage drop per meter (or foot) of wire using the resistance per length unit for an 18-gauge copper wire.

Since an 18-gauge wire has specific resistance (often found in tables or the manufacturer's specifications), that value can be applied to determine how the calculated voltage drop correlates to a length. For example, if the resistance of an 18-gauge copper wire is 6.385 ohms per kilometer (0.006385 ohms per meter), and the power saw draws 9.0 A, the maximum permissible voltage drop of 5 V could be distributed across a specific length of wire without exceeding the minimum requirement of 115 V at the tool.

Conclusion:

Using the calculated resistance, the homeowner or electrician can then calculate the exact permissible length, ensuring the power saw operates within safe electrical parameters. It's essential to consult up-to-date tables for wire resistance to ensure accuracy.

Find the number of moles of water that can be formed if you have 210 mol of hydrogen gas and 100 mol of oxygen gas.

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200 moles The balanced equation for creating water from hydrogen and oxygen gas is 2H2 + O2 => 2H2O So for every mole of oxygen gas, you need two moles of hydrogen. So looking that the amount of oxygen and hydrogen you have, it's obvious that oxygen is the limiting reactant since 100 moles of oxygen will consume 200 moles of hydrogen. While 210 moles of hydrogen requires 105 moles of oxygen. Now for each mole of oxygen gas you use, you create 2 moles of water. So 100 mol * 2 = 200 mol So you can create 200 moles of water from the given amounts of reactants.

How can you tell whether one glass of water has more thermal energy than another, identical glass of water

Answers

you can know which one has more thermal energy by testing the temperature, if it is warmer the more energy it has because the particles are going faster than they would if it was cold. because, when its cold the particles slow down until they are so cold they are frozen. (ice).
According to my school book thermal energy is the total kinetic energy of the particles that make up a substance thermal energy is measured in joules know that this is different from the temperature for it is the average kinetic energy while the thermal energy is the total kinetic energy.not done answering this

Write the complete and balanced chemical equation for this precipitation reaction. feso4(aq)+ba(oh)2(aq)→

Answers

The chemical reaction that appears between the given compounds, ferrous sulfate and barium hydroxide, is a double replacement reaction. This is due to  the activity series of the metals being able to replace either of them in the compound. To balance the chemical reaction, ensure that the number of moles of each of the atoms in both sides of the equation are equal.

The answer to this item is,
          FeSO₄(aq) + Ba(OH)₂(aq) --> BaSO₄(s) + Fe(OH)₂ (aq)

As can be seen in the resulting equation, it does not need to be modified to balance it. 

Final answer:

The balanced chemical equation for the reaction between FeSO₄ (aq) and Ba(OH)₂ (aq) is FeSO₄ (aq) + Ba(OH)₂ (aq) → BaSO₄ (s) + Fe(OH)₂ (aq), where BaSO₄ is the precipitate formed.

Explanation:

The question asks to write the complete and balanced chemical equation for the precipitation reaction between FeSO₄ (aq) and Ba(OH)₂ (aq). This is a double displacement reaction, where the cation from one reactant pairs with the anion from the other, and vice versa, potentially forming a precipitate.

The balanced chemical equation for this reaction is:

FeSO₄ (aq) + Ba(OH)₂ (aq) → BaSO₄ (s) + Fe(OH)₂ (aq)

In this reaction, barium sulfate (BaSO₄) is the precipitate, which is indicated by the (s) after its formula. This equation shows that iron(II) sulfate reacts with barium hydroxide to form barium sulfate as a precipitate and iron(II) hydroxide in the aqueous solution. Proper balancing of the equation is crucial for accurately representing the law of conservation of mass.

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