Consider the model of a sodium atom. An orange circle labeled upper N a is surrounded by three concentric circles. The innermost ring has dots at the north and south positions. The next ring has eight dots, evenly spaced, with dots aligning with those in the inner ring. The outermost ring has one dot at the north position. Which feature does the model show accurately?
A) the size of the electrons in different shells
B) the shapes of the orbitals in different shells
C)the distribution of electrons in different shells
D)the orientation of the orbitals in different shells
Answer:
C would be the answer.
Explanation:
Answer:
The answer is C. the distribution of electrons in different shells
Explanation:
I got it right on the test
How much energy is required to melt a 9.070kg (convert to grams first: 1kg=1000g) bag of ice at 0ºC? Write the formula and write answer with unit.
Answer:
The energy required to melt 9.070 kg of ice is 3047520 J
Explanation:
The mass, m of the ice = 9.070 kg = 907.0 g
The latent heat of fusion, [tex]L_f[/tex]° for ice = 3.36×10⁵ J/Kg
Therefore we have the formula for the energy required to melt the mass m equals
[tex]\Delta H = m \times L_f[/tex]
Plugging in the values, we have;
ΔH = 3.36 × 10⁵ J/Kg×9.070 kg = 3047520 J or
ΔH = 3.36 × 10² J/g×9070 g = 3047520 J
Therefore, the energy required to melt 9.070 kg of ice = 3047520 J.
A student is observing different structures of a seed plant during a lab activity. She has identified tiny structures that look like powder.
Which structures did the student most likely identify?
Please hurry!! i will try to give brainly to the first person to answer correctly
What effect do tube dwelling worms have on mudflat ecosystems?
Tube-dwelling worms contribute to the health of mudflat ecosystems by aerating the sediment and recycling nutrients, which supports diverse life and adds to the complexity of the food web. They provide essential services that help maintain ecosystem balance.
Explanation:Tube-dwelling worms play a significant role in mudflat ecosystems. By burrowing into the sediment, the worms aerate the mud, which facilitates the penetration of oxygen and helps recycle nutrients. This process can enhance the productivity of the mudflat by supporting a diverse range of organisms. Tube-dwelling worms, like those around hydrothermal vents, form symbiotic relationships with bacteria. Although the worms you asked about are not the same as those at hydrothermal vents, the principle of symbiosis might still hold in their interactions with other organisms in the mudflat. The tube worms contribute to the complexity of the food web as they become prey for higher-order predator vertebrates. Therefore, their presence and activities are integral to maintaining the structural and functional integrity of the muddy environment they inhabit.
explain why biodiversity is important. You must have 6 sentences and at least 1 example of biodiversity.
Biodiversity is vital for ecosystem resilience, economic benefits, and human health, with examples like the Amazon rainforest illustrating its importance. Biodiversity also provides essential genetic resources for breeding and holds undiscovered potential for scientific advancement.
Biodiversity is paramount due to its extensive benefits to ecosystems, the economy, and human health. With over 5 million known species, biodiversity contributes to the resilience of ecosystems, allowing them to recover from disturbances and providing a buffer against catastrophic events. An example of biodiversity is the Amazon rainforest, where a vast number of species coexist, each playing a role in maintaining the ecological balance. Economic benefits stem from biodiversity's direct provision of food, medicine, and raw materials, many of which we are yet to fully discover and understand. Biodiversity also ensures the availability of genetic resources which are crucial for crop and livestock breeding, leading to food security. Our current lack of knowledge about so many species indicates there is much more to learn, including potential breakthroughs in science and medicine that could enrich human life.
What to types of eukaryotes does not photosynthesize.
PLZ HELP I NEED QUICKLY
Answer:
plastids
Explanation:
chloroplasts, chromoplast and leucoplasts, that all conduct photosynthesis
Ammonia, NH3, is produced by the reaction N2 (g) + 3H2 (g) → 2NH3 (g). if 3.50 mol of nitrogen is present, what volume of NH3 at 25.0°C and 1.15atm of pressure can be made?
a
0.312 L
b
74.5 L
c
157 L
d
149 L
Answer:
Option D. 149L
Explanation:
Step 1:
The balanced equation for the reaction. This is given below:
N2 (g) + 3H2 (g) → 2NH3 (g)
Step 2:
Determination of the number of mole of NH3 produced by the reaction of 3.50 mole of N2. This is illustrated below:
From the balanced equation above,
1 mole of N2 reacted to produce 2 moles of NH3.
Therefore, 3.5 moles of N2 will react to produce = 3.5 x 2 = 7 moles of NH3.
Therefore, 7moles NH3 is produced.
Step 3:
Determination of the volume of NH3 produced from the reaction. This can be achieved as shown below:
Data obtained from the question include:
Temperature (T) = 25.0°C = 25.0°C + 273 = 298K
Pressure (P) = 1.15 atm
Number of mole (n) = 7 moles
Gas constant (R) = 0.082atm.L/Kmol
Volume (V) =..?
Applying the ideal gas equation to obtain the volume:
PV = nRT
Divide both side by P
V = nRT /P
V = (7 x 0.082 x 298)/1.15
V = 149 L
Therefore, the volume of NH3 produced from the reaction is 149L
Why is it that some people get a static shock when they walk across the carpet and touch a metal surface?
Answer:
This happens because there was an electric charge.
56.5 g of sodium nitrate is dissolved in water to make 627 g of solution . what is the percent sodium nitrate in the solution
Answer:
9.01%
Explanation:
The following data were obtained from the question:
Mass of sodium nitrate, NaNO3 = 56.5g
Mass of solution = 627g
The percentage composition of sodium nitrate, NaNO3 in the solution can be obtained as follow:
Percentage composition of NaNO3 = Mass of NaNO3/mass of solution x 100
Percentage composition of NaNO3 = 56.5/627 x 100 = 9.01%
Therefore, the percentage composition of sodium nitrate, NaNO3 in the solution is 9.01%
Answer:
The percentage of sodium nitrate in the solution is 9.01%
Explanation:
Here we have;
56.5 g of sodium nitrate dissolved in water to make a solution of mass = 627 kg
Mass of sodium nitrate, NaNO₃, in the solution = 56.5 g
Mass of resultant solution = 627 g
The relation for the percentage of a solute by mass dissolved in a solvent is presented as follows;
[tex]Percentage \, by \, mass = \frac{Mass \, of \, solute}{Mass \, of \, solution} \times 100[/tex]
Therefor, for the 56.5 g of sodium nitrate solution, we have;
[tex]Percentage \, by \, mass \, of \, NaNO_3 = \frac{Mass \, of \, NaNO_3}{Mass \, of \, solution} \times 100 = \frac{56.5 \, g}{627 \, g} \times 100 = 9.01 \%[/tex]
How does the molecular property of water affect its cohesive properties?
5. A 4.44 L container holds 0.481 mol of O2 at 22.6°C. What is the pressure of the tank?
(Show work and u
Answer: The pressure of the tank will be 2.63 atm
Explanation:
According to ideal gas equation:
[tex]PV=nRT[/tex]
P = pressure of gas = ?
V = Volume of gas = 4.44 L
n = number of moles = 0.481
R = gas constant =[tex]0.0821Latm/Kmol[/tex]
T =temperature =[tex]22.6^0C=(22.6+273)K=295.6K[/tex]
[tex]P=\frac{nRT}{V}[/tex]
[tex]P=\frac{0.481mol\times 0.0821Latm/K mol\times 295.6K}{4.44L}=2.63atm[/tex]
The pressure of the tank will be 2.63 atm
Answer: The pressure of given tank is 2.63 K.
Explanation:
The given data is as follows.
V = 4.44 L, n (no. of moles) = 0.481 mol,
T = [tex]22.6^{o}C[/tex] = (22.6 + 273) K = 295.6 K
R (ideal gas constant) = 0.0821 atm L/mol K
Now, using the ideal gas equation we will calculate the pressure of the given tank as follows.
PV = nRT
[tex]P \times 4.44 L = 0.481 mol \times 0.0821 atm L/mol K \times 295.6 K[/tex]
P = 2.63 atm
Therefore, we can conclude that the pressure of given tank is 2.63 K.
How many grams of H2O will be produced if 750 grams of Fe are produced?
Fe3O4+ H2 → Fe+H2O
Answer:
Roughly 323g of H2O.
Explanation:
Balance your chemical equation:
1 Fe3O4 + 4H2 → 3 Fe + 4 H2O
Modulate your stoichiometry 4 steps:
[tex]750g \times \frac{1mol}{55.8g} \times \frac{4mol}{3mol} \times \frac{18g}{1mol} = \\ = \frac{54000}{167.4} = \\ = 322.581g[/tex]
To calculate the atoms of an element in a given molecule, we need to multiply stoichiometry by the number that is written on the foot of that element. Therefore, 180g of H2O will be produced if 750 grams of Fe are produced.
What is stoichiometry?Stoichiometry is a part of chemistry that help us in making relationship between reactant and product from quantitative aspects.
The balanced equation is
Fe[tex]_3[/tex]O[tex]_4[/tex]+ 4H[tex]_2[/tex] → 3Fe+ 4H[tex]_2[/tex]O
Molar mass of Fe=55.845 g/mol
mass of Fe=750 grams
Moles of Fe=13.4moles
The mole ratio between water and Fe is 3:4.
moles of H[tex]_2[/tex]O produced=(3/4)×13.4moles=10.0
Mass of H[tex]_2[/tex]O produced=molar mass of H[tex]_2[/tex]O × number of moles of H[tex]_2[/tex]O
Mass of H[tex]_2[/tex]O produced=18× 10.0
Mass of H[tex]_2[/tex]O produced=180g
Therefore, 180g of H2O will be produced if 750 grams of Fe are produced.
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How many moles of H2SO4 are needed to prepare 200 mL of a 1.0 M solution?
Which is the correct net ionic equation for the following reaction: 2 HBr (aq) + Co(OH)2 (aq) Imported Asset CoBr2 (aq) + 2 H2O (l)?
A. H+ (aq) + OH− (aq) Imported Asset H2O (l)
B. Co(OH)2 (aq) Imported Asset Co+2 (aq) + OH− (aq)
C. 2 H+ (aq) + Co(OH)2 (aq) Imported Asset Co+2 (aq) + 2 H2O (l)
D. 2 HBr (aq) + Co(OH)2 (aq) Imported Asset CoBr2 (aq) + 2 H2O (l)
its B why because the reaction is good with B
Ammonia (NH3(g), AH = -46.19 kJ/mol) reacts with hydrogen chloride (HCl(g), AH = -92.30 kJ/mol) to
form ammonium chloride (NH4Cl(s), AH = -314.4 kJ/mol) according to this equation:
NH3(g) + HCl(9) ► NH4Cl(s)
What is AHxn for this reaction?
The enthalpy of a reaction can be predicted from the enthalpy of reactants and products. The enthalpy of the reaction is - 175.9 kJ/mol.
What is reaction enthalpy ?The enthalpy of a reaction is the heat energy released or absorbed by the reaction system. For heat absorption, enthalpy is positive and for evolution, enthalpy is negative.
Th enthalpy of reaction = enthalpy of products - enthalpy of reaction.
Given enthalpy of reactants
ΔH (NH₃) = -46.19 kj/mol
ΔH(HCl) = - 92.30 kj/mol
ΔH(NH₄Cl) = -314.4 kj/mol
Reaction enthalpy = -314.4 kj/mol - (-46.19 kj/mol +- 92.30 kj/mol ) =- 175.9 kJ/mol.
Therefore, the reaction enthalpy is - 175.9 kJ/mol..
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PLEASE HELP ASAP I WILL MARK BRAINLIEST!! THANK YOU
Given that each of the following compounds has six carbons, which has the most hydrogens?
Select one:
a. alkane
b. alkene
c. alkyne
d. benzene
Answer:
Pretty sure that its benzene
What is the change in electrons for manganese in the following reaction?? 2 MnO 4 - ( aq ) + H 2 O 2 ( aq ) + 6 H + ( aq ) -> 2 Mn 2+ ( aq ) + 3 O 2 ( g ) + 4 H 2 O( l )
The change in electrons for manganese in the reaction is a gain of 5 electrons per atom, as it is reduced from +7 to +2 during the redox process, resulting in a total gain of 10 electrons for the two Mn atoms involved.
Explanation:The change in electrons for manganese in the given reaction is a reduction process where manganese (Mn) changes from an oxidation state of +7 to +2. Manganese is initially part of the permanganate ion, MnO4-, with an oxidation state of +7 for manganese. In the reaction with hydrogen peroxide (H2O2), manganese is reduced to Mn2+ with an oxidation state of +2.
Considering the change in oxidation state from +7 to +2, each manganese atom gains 5 electrons during the reaction. This means that for two Mn atoms, as shown in the reaction, there is a total gain of 10 electrons. This is a classic example of a redox reaction, demonstrating the change in oxidation states and the fundamental concept of electron transfer.
What are the genotypes of the parents?
The Punnett square shows the possible genotype
combinations for the offspring of two parents.
O Gg and Gg
O GG and GG
Ogg and gg
O Gg and gg
GG
Gg
gg
Answer:
Gg and Gg
Explanation:
Can any one help on this one
Consider the following balanced reaction:
4NH3 (g) + 502 (g) – 4NO (g) + 6H20 (g)
How many grams of ammonia are required to react completely with 40 g of oxygen?
A. 154
B.
179
C. 34 g
D.
19 g
Answer:
17g
Explanation:
4NH3 (g) + 502 (g) –> 4NO (g) + 6H20 (g)
Mass of O2 mole = 32g
Therefore 5O2 = 160g
Mass of NH3 mole = 17g
Therefore 4NH3 = 17 x 4 =68g
Required amount of NH3 = 68 x 40/160 = 17g
Which allele is recessive?
Select all the correct answers.
What are some applications of fission reactions?
as a zero-waste energy source
for generating large amounts of heat
for creating stable elements from unstable ones
for creating new, heavier elements
n
as the energy source in nuclear weapons
Reset
Next
Some applications of fission reactions are for generating large amounts of heat and as the energy source in nuclear weapons.
What is a fission reaction?Nuclear fission is a reaction in which the nucleus of an atom splits into two or more smaller nuclei.
Nuclear fission can be useful in terms of generating large amounts of heat that can be used to produce nuclear power and as the energy source in nuclear weapons.
Thus, some applications of fission reactions are for generating large amounts of heat and as the energy source in nuclear weapons.
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Answer:
B, C, E
Explanation:
1. What happens to a wave if it experiences reflection?
What factor besides temperature affects the boiling point of water?
A. Mass
B. Volume
C. Pressure
D. Number of moles
Answer: C. Pressure
Explanation:
Sometimes engineers increase output through crossbreeding. This is when
they:
A. combine two plants so that each plant's strength compensates for
the other's weakness.
B: genetically alter the DNA of a plant to produce a desired trait.
C. cultivate a variety of plants in one area so that cross
contamination does not occur.
D. cultivate a variety of plants in one area so that one pest does not
destroy all the crops.
Crossbreeding in agriculture involves combining two plants to create a new variety with improved traits by using traditional breeding techniques or modern genetic engineering to produce GMOs.So the correcct option is A.
Explanation:When engineers increase output through crossbreeding, they are combining two plants so that each plant's strengths compensate for the other's weaknesses. This is a method that has been employed to develop new crop varieties with desirable traits such as disease resistance, better nutritional value, and improved shelf-life. Crossbreeding can involve traditional breeding techniques with closely related species or could be done through modern biotechnology practices - creating genetically modified organisms (GMOs), where specific genes are introduced to give the crop beneficial traits like herbicide resistance, better taste, or drought tolerance.
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100 POINTS-
Which organelle could best be compared to a closet in a house?
A. chloroplast
B. mitochondrion
C. nucleus
D. vacuole
Answer:
Im no scientist but I think its D. vacuole
Explanation:
Choose all the answers that apply.
Erosion can be reduced by:
removing topsoil
contour plowing
planting trees
putting up fences
Answer:
removing topsoil, and putting up fencing
Explanation:
hopefully this is correct :)
How big is the solar system compared to universe
Answer:
You are one of the billions of people on our Earth. Our Earth orbits the Sun in our Solar System. Our Sun is one star among the billions in the Milky Way Galaxy. Our Milky Way Galaxy is one among the billions of galaxies in our Universe.
Explanation:
Hi!The solar system has a diameter more than 40 times greater than the distance to the sun, but the solar system is a tiny part of much larger galaxy. Our galaxy (Milky Way) is only one of billions of other galaxies in the universe.
Which is a characteristic of a weak electrolyte?
It does not dissociate or ionize in water.
It partially dissociates or ionizes in water.
It does not conduct electricity.
It easily conducts electricity.
O
Answer:
A weak electrolyte is an electrolyte that does not completely dissociate in aqueous solution. The solution will contain both ions and molecules of the electrolyte. Weak electrolytes only partially ionize in water (usually 1% to 10%), while strong electrolytes completely ionize (100%).
Explanation:
The weak electrolyte are characterized to be partially dissociates or ionizable in water. Hence, option B is correct.
What is an electrolyte?Electrolyte can be given as the chemical compound present in the form of liquid or gel with the ability to dissociate into the constituent ion on the dissolution or the application of electricity.
The ability of the electrolyte to be dissociated into the constituent ions differentiate them as strong and weak electrolytes. The electrolytes that can be easily dissociated into the constituent ions are termed as strong electrolytes.
The compounds that found not to be completely ionized into the constituent ions on dissolution in water are termed as weak electrolytes. These are partially ionizable. Thus, option B is correct.
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Which equation correctly shows how you could
calculate [OH-] from [H*]?
[OH-1 -1.010-14
[H*]
[H+1 -1.0 x 10-14
[OH-]
The correct equation to calculate [OH-] from [H+] is [OH-] = Kw / [H+], with Kw being 1.0 × 10^-14 at 25°C.
Explanation:The correct equation to calculate [OH-] from [H+] is Kw = [H+][OH-], where Kw is the ion-product constant for water (1.0 × 10-14 at 25°C). You can rearrange this equation to solve for [OH-] if [H+] is known: [OH-] = Kw / [H+]. For example, if a solution has a hydronium ion concentration [H3O+] of 1.0 × 10-1M, the hydroxide ion concentration [OH-] can be calculated as follows: [OH-] = 1.0 × 10-14 / 1.0 × 10-1 = 1.0 × 10-13M.