Any salt, even though it reacts with water, will precipitate out completely when the water is completely evaporated. If you start with 50 grams of salt, you will end up with 50 grams of salt.
Draw the product you expect from the reaction of (s)-3-iodohexane with ch3co2-. be sure to show stereochemistry.
This will give substituted product which will be by SN2 mechanism
so here we will get product with inverted geometry
In SN2 mechanism the nucleophile attacks from back side and we always get product with inverted geometry
This is known as Walden inversion.
Final answer:
The reaction of (S)-3-iodohexane with acetate ion will result in the formation of (R)-3-hydroxyhexane due to a backside attack, inverting the configuration at the chiral center.
Explanation:
The student's question involves predicting the product of the nucleophilic substitution reaction of (S)-3-iodohexane with the acetate ion (CH3CO2-). This reaction is an example of a backside attack in which the nucleophile approaches the electrophilic carbon atom from the side opposite to the leaving group (in this case, iodine). Because the reaction involves a chiral center, we must consider the effects on stereochemistry.
Since (S)-3-iodohexane has an S configuration, the nucleophilic attack by the acetate ion will invert the configuration at the chiral center resulting in the formation of the (R)-3-hydroxyhexane. It is important to draw all the substituents in their appropriate positions to show this inversion of stereochemistry accurately.
According to the Heisenberg uncertainty principle, if the position of a moving particle is known, what other quantity cannot be known?
The correct answer is velocity.
A law in quantum mechanics, which restricts that how precisely one can determine the two associated variables is known as the Heisenberg uncertainty principle. Heisenberg illustrated this using something known as the observer effect that illustrates that very act of determining one value influences the other, and thus, presents certain kind of uncertainty.
Heisenberg uncertainty principle, also known as uncertainty principle postulated by the German physicist Werner Heisenberg, that the velocity and the position of an object cannot be determined exactly at the similar time, even in theory.
Answer: It’s velocity
Explanation:
how is an unknown oxidation state of an element within a compound determined?
a. it is determined from known oxidation state of an element within a compound determined
b. it is always the same as the most likely oxidation state
c. it will be the same as the charge on the compound
d. it will be the same in the products is in the reactants
Answer is: a. it is determined from known oxidation state of an element within a compound determined.
Oxidation state (oxidation number) shows the degree of oxidation of an atom in a chemical compound.
For example, chlorate ion (ClO₃⁻) has negative charge.
One oxygen atom in this anion (negatively charged ion) has the oxidation number -2. There are three oxygen atoms in chlorate anion.
x + 3 · (-2) = -1.
x = -1 + 6.
x = +5; the oxidation number of chlorine.
The oxidation state of Cl (chlorine) in chlorate ion is +5.
how can you tell a Ca(NO3)2 solution from a Zn(NO3)2 solution?
You can distinguish between a Ca(NO3)2 solution and a Zn(NO3)2 solution by performing a precipitation reaction test. Adding NaOH to the solutions will result in the formation of a white precipitate in the Zn(NO3)2 solution, but not in the Ca(NO3)2 solution.
Explanation:You can tell a Ca(NO3)2 solution from a Zn(NO3)2 solution by performing a chemical reaction test called a precipitation reaction. When a solution of NaOH is added to a Zn(NO3)2 solution, a white precipitate of Zn(OH)2 is formed. However, when NaOH is added to a Ca(NO3)2 solution, no precipitation occurs.
This is because Zn(OH)2 is insoluble in water and forms a white solid precipitate, while Ca(NO3)2 does not form a precipitate with NaOH as calcium hydroxide is soluble in water.
Therefore, by observing the formation or absence of a white precipitate when adding NaOH to the respective solutions, you can distinguish between a Ca(NO3)2 solution and a Zn(NO3)2 solution.
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To distinguish between a [tex]Ca(NO\(_3\))\(_2\)[/tex] solution and a [tex]Zn(NO\(_3\))\(_2\)[/tex]solution, one can perform a series of qualitative tests and observations.
Here are some methods:
1. Flame Test:
Add a few drops of the unknown solution to a flame using a clean platinum or nichrome wire. Calcium ions[tex](Ca\(^{2+}\) )[/tex] in [tex]Ca(NO\(_3\))\(_2\)[/tex]will impart an orange-red color to the flame, while zinc ions [tex](Zn\(^{2+}\))[/tex] in [tex]Zn(NO\(_3\))\(_2\)[/tex]will not produce a characteristic flame color.
2. Precipitation Reactions:
a. Add a few drops of ammonia solution to the unknown solution. Zinc ions will form a white precipitate of zinc hydroxide,[tex]Zn(OH)\(_2\)[/tex], which will dissolve in excess ammonia to form a clear solution due to the formation of tetraamminezinc(II) complex, [tex][Zn(NH\(_3\))\(_4\)]\(^{2+}\).[/tex]Calcium ions will not form such a complex and will remain as a precipitate of calcium hydroxide, [tex]Ca(OH)\(_2\).[/tex]
b. Add sodium sulfate solution to the unknown solution. Calcium ions will react with sulfate ions to form a white precipitate of calcium sulfate, [tex]CaSO\(_4\)[/tex], which is insoluble in water. Zinc sulfate, [tex]ZnSO\(_4\)[/tex], is soluble in water, so no precipitate will form in the presence of zinc ions.
3. Conductivity Test:
Both solutions will conduct electricity due to the presence of ions. However, the conductivity of the solutions will not help in distinguishing between the two since both have similar numbers of ions when dissolved in water.
4. Solubility Test:
Both[tex]Ca(NO\(_3\))\(_2\)[/tex]and [tex]Zn(NO\(_3\))\(_2\)[/tex] are generally soluble in water, so this test may not be conclusive. However, if a precipitate forms upon dissolving the salt in water, it could indicate the presence of calcium, as some calcium salts have limited solubility in water.
5. Complexometric Titration:
Using a chelating agent like EDTA (ethylenediaminetetraacetic acid) in a complexometric titration can differentiate between the two. Zinc ions will react with EDTA to form a stable complex, while calcium ions will not react as readily under the same conditions. This can be indicated by a suitable metal ion indicator such as Eriochrome Black T for calcium or xylenol orange for zinc.
By performing these tests, one can determine whether the solution contains calcium nitrate or zinc nitrate based on the observations made during each reaction.
How many moles of oxygen gas (O2) are in a 2.50 L container at standard temperature and pressure?
2.24 x 10^1 mol O2
1.12 x 10^–1 mol O2
2.50 x 10^0 mol O2
5.60 x 10^1 mol O2
Hey there!:
1 mole O2 ----------------- 22.4 L ( at STP )
( moles O2 ) -------------- 2.50 L
moles O2 = 2.50 * 1 / 22.4
moles O2 = 2.50 / 22.4
moles O2 = 1.12*10⁻¹
Answer B
Hope that helps!
1.12 x 10^–1 mol O2 moles of oxygen gas (O2) are in a 2.50 L container at standard temperature and pressure. Therefore, option B is correct.
What do you mean by mole ?The term mole is defined as the amount of substance of a system which contains as many elementary entities.
One mole of any substance is equal to 6.023 × 10²³ units of that substance such as atoms, molecules, or ions. The number 6.023 × 10²³ is called as Avogadro's number or Avogadro's constant.
The mole concept can be used to convert between mass and number of particles.
1 mole O2 = 22.4 L (at STP)
(moles O2) = 2.50 L
moles O2 = 2.50 × 1 / 22.4
moles O2 = 2.50 / 22.4
moles O2 = 1.12 × 10⁻¹
Thus, 1.12 x 10^–1 mol O2 moles of oxygen gas (O2) are in a 2.50 L container at standard temperature and pressure, option B is correct.
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Which of these would provide the best evidence for the theory of evolution?
A
Certain areas on the West Coast of America are more prone to earthquakes.
B
Fossils are typically found by paleontologists working with geologists.
C
Fossils of lion skulls show that lions used to look different.
D
Animals today share the exact same traits as animals from millions of years ago.
C.
evolution is the change a species goes through
The best evidence for evolution among these options is 'Fossils of lion skulls show that lions used to look different.' Fossil records show physical proof of evolutionary changes in species over time. This helps to support the theory of evolution.
Explanation:The best evidence for the theory of evolution among these options is C: Fossils of lion skulls show that lions used to look different.
This is a crucial evidence for evolution because it represents physical proof that species over time have undergone evolutionary changes. Through the study of succession and alterations in fossil records, we can trace how modern species have evolved from their ancestors, which is a fundamental principle of the theory of evolution. None of the other options provided directly provide evidence that supports the concept of evolution.
Fossil records serve as a timeline, mapping out the gradual changes in species over millions of years. For instance, if a series of lion skull fossils show an observable pattern of changes - such as in the shape, size, or structure over time, it suggests that lions have evolved to adapt to their environment, thus supporting the theory of evolution.
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In a mixture of argon and hydrogen, occupying a volume of 1.18 l at 894.6 mmhg and 44.1oc, it is found that the total mass of the sample is 1.25 g. what is the partial pressure of argon?
To solve the question, there is a need to use the equation:
PV = nRT
(894.6/760) × 1.18 = n × 0.0821 × (273 + 44.1)
By solving we get:
Total moles, n = 0.053
Assume, the moles of argon as a and of hydrogen as b,
So,
40 × a + 2 × b = 1.25 --------- (i)
a + b = 0.053 ------- (ii)
By solving i and ii we get:
a = 0.03,
Thus, mole fraction of Ar = XAr = 0.03/0.053 = 0.57
So,
Partial pressure of Ar = 894.6 × XAr = 894.6 × 0.57 = 509.92 mm Hg
An unknown material has a mass of 5.75 g and a volume of 7.5 cm3.
What is the density of the material? Round to the nearest tenth.
A. 0.8 g/cm3
B. 8 g/cm3
C. 0.7 g/cm3
D. 1.3 g/cm3
Hey there!:
Mass = 5.75 g
Volume = 7.5 cm³
Therefore:
Density = mass / volume
D = 5.75 / 7.5
D = 0.7 g/cm³
Answer C
Hope that helps!
Why does earth’s rotation axis lean toward the sun for only one-half of its orbit?
The earth is inclined to the plane of its orbit by 23.5 degrees. Therefore for half the time in its earth on its orbit, the north pole will be inclined towards the sun. During this period, the pole receives six months of continuous sunshine. In the other half of the revolution around the sun, the north pole is tilted away from the sun hence receives darkness for 6 months.
in the equation 2K+ 2H2O ---> 2KOH +H2
How much hydrogen is produced of only .04 mol of potassium is used?
A. .01 mol of H2
B. .02 mol of H2
C. .03 mol H2
D. .04 mol of H2
please help and explain the answer
The much hydrogen that is produced is 0.02 mol of H₂ (answer B)
Explanation
2K +2H₂O→ 2 KOH + H₂
Use the mole ratio to determine the moles of H₂
From equation above the K :H₂ is 2:1
Therefore the moles of H₂ = 0.04 x 1/2 = 0.02 mol of H₂
Final answer:
Using the stoichiometric ratios from the balanced chemical equation, 0.04 moles of K will produce 0.02 moles of H₂, which is answer B.
Explanation:
When solving a stoichiometry problem, start by looking at the balanced chemical equation:
2K + 2H₂O → 2KOH + H₂
The balanced equation tells us that 2 moles of potassium (K) will produce 1 mole of hydrogen (H₂). To find how much hydrogen is produced when .04 moles of potassium is used, set up a ratio based on the stoichiometry of the balanced equation:
2 moles K : 1 mole H2 = 0.04 moles K : x moles H₂
Solving for x gives us:
x = (0.04 moles K) × (1 mole H₂) / (2 moles K)
x = 0.02 moles H₂
Therefore, the answer is B. 0.02 mol of H₂.
Balance the following reaction:
A2B + DC3 --> AC + D2B3
Hint: Don't do this in your head. Use a piece of paper and a pencil.
When this reaction is balanced, what number must be to the left of AC?
The balanced reaction is as below
3A₂B + 2DC₃→ 6 AC + D₂B₃
The number that must be to the left of AC is 6
Explanation
According to the law of mass conservation , the number of atoms in reactant side must be equal to number to the number of atoms in product side.Therefore the equation above is balance since it obey the law of mass conservation. For example there is 6 atoms of A in reactant side and 6 in product side.Which of the following rock types form from placing other rocks under heat and pressure? A. Sedimentary rock B. Metamorphic rock C. Intrusive igneous rock D. Extrusive igneous roc
Your answer should be metamorphic rock.
I think the answer is B. Metamorphic rock.
Carbon tetrachloride has been widely used in the cleaning industry, in fire extinguishers, and as a refrigerant. Construct an explanation of how carbon and chlorine combine to form carbon tetrachloride.
A) Nonmetal carbon shares valence electrons with each nonmetal chlorine forming four covalent bonds.
B) Nonmetal carbon loses a valence electron and chlorine metal gains a valence electron to form an ionic bond.
C) Carbon and chlorine are nonmetals and they shares their valence electrons to become ions and form ionic bonds.
D) Chlorine metal loses a valence electron to become a cation and nonmetal carbon gains a valence electron to become an anion forming a covalent bond.
Answer: A) Nonmetal carbon shares valence electrons with each nonmetal chlorine forming four covalent bonds.
Explanation:Carbon has atomic no 6 and has 4 valence electrons. It can only share electrons as it is difficult to gain or lose 4 electrons to complete it's octet.
[tex]C:1s^22s^22p^2[/tex]
Chlorine has atomic no 17 and has 7 valence electrons and need one electron to complete its octet.
[tex]Cl:1s^22s^22p^63s^23p^5[/tex]
Thus carbon will share 4 electrons, one each with four chlorine atoms to form carbon tetra chloride.
Covalent bond is formed by sharing of electrons between atoms.
Ionic bond is formed by transfer of electrons between atoms.
Answer:
A) Nonmetal carbon shares valence electrons with each nonmetal chlorine forming four covalent bonds.
Explanation:
I Just answered it :p
Describe the interactions of the nervous and muscular system. please write a paragraph and do not plagiarize If you need to cite the text you use to help you but try to write in your own words Thank you soooo much!
The systems within the body associate with each other to keep the organism in a healthy state. Though every system of the body exhibits particular functions, they all are dependent and inter-associated with each other. The nervous system controls various systems of the body.
The muscular system comprises distinct kinds of muscles that permit motion, produce heat to sustain a temperature of the body, does contraction of the heart, and move the food via the digestive tract. It comprises three kinds of muscles, that is, smooth, skeletal, and cardiac muscles.
The muscular system coordinates with the nervous system and does various functions. The receptors found in muscles instruct the brain with the information regarding the movement and position of the body. The brain monitors the contraction of skeletal muscle. The nervous system monitors the speed at which food passes through the digestive tract.
A sample has a hydrogen ion concentration of 1 × 10−2. What happens if the hydrogen ion concentration increases? The acidity decreases. The pH decreases. The hydroxide ion concentration increases. The solution becomes more basic.
Answer : The correct option is, The pH decreases.
Explanation :
As we know that,
pH : It is defined as the negative logarithm of hydrogen ion concentration.
Mathematically it is represented as :
[tex]pH=-\log [H^+][/tex]
According to the question, when the concentration of hydrogen ion increases then the value of pH decreases and the acidity of the solution also increases that means the solution is more acidic in nature.
Hence, if the hydrogen ion concentration increases, the pH decreases.
Answer:
The pH decreases
Explanation:
Hello,
pH is mathematically defined via:
[tex]pH=-log([H^{+} ])[/tex]
Since at the beginning, the concentration of hydride ion is 1e-2M, the pH is:
[tex]pH=-log(1x10^{-2} )=2.0[/tex]
If it is increased, lets suppose to 1.1e-2, the new pH turns out into:
[tex]pH=-log(1.1x10^{-2} )=1.96[/tex]
So the pH decreases, which means that the acidity increases as well.
Best regards.
Which of the following transformation occur (In different kind of waves)
a wind turbine creating eletricity
eletric gutair
a campfire
Answer: A wind turbine creating electricity converts the kinetic energy of the wind to mechanical energy for movement of blades and finally to electrical energy.
A electric guitar first converts kinetic energy to electrical energy and then electrical energy is converted to sound energy.
A campfire converts the potential chemical energy into heat and light energy by the process of combustion.
As we know from the conservation of energy, it is neither created nor destroyed, it only converts from one form to another.
What would be the change in pressure in a sealed 10.0 l vessel due to the formation of n2 gas when the ammonium nitrite in 2.40 l of 0.900 m nh4no2 decomposes at 25.0°c?
The change in pressure in a sealed 10.0L vessel is 5.28 atm
calculation
The pressure is calculated using the ideal gas equation
That is P=n RT
where;
P (pressure)= ?
v( volume) = 10.0 L
n( number of moles) which is calculated as below
write the equation for decomposition of NH₄NO₂
NH₄NO₂ → N₂ +2H₂O
Find the moles of NH₄NO₂
moles = molarity x volume in liters
= 2.40 l x 0.900 M =2.16 moles
Use the mole ratio to determine the moles of N₂
that is from equation above NH₄NO₂:N₂ is 1:1 therefore the moles of N₂ is also =2.16 moles
R(gas constant) =0.0821 l.atm/mol.K
T(temperature) = 25° c into kelvin = 25 +273 =298 K
make p the subject of the formula by diving both side by V
P = nRT/V
p ={ (2.16 moles x 0.0821 L.atm/mol.K x 298 K) /10.0 L} = 5.28 atm.
Answer : The pressure of the gas will be, 5.285 atm
Solution : Given,
Volume of [tex]N_2[/tex] gas = 10 L
Temperature of gas = [tex]25^oC=273+25=298K[/tex] [tex](0^oC=273K)[/tex]
Volume of [tex]NH_4NO_2[/tex] = 2.40 L
Molarity of the ammonium nitrate solution = 0.9 M
First we have to calculate the moles of ammonium nitrate.
[tex]\text{ Moles of }NH_4NO_2=\text{ Molarity of }NH_4NO_2\times \text{ Volume of }NH_4NO_2[/tex]
[tex]\text{ Moles of }NH_4NO_2=(0.9mole/L)\times (2.40L)=2.16moles[/tex]
The balanced chemical reaction is,
[tex]NH_4NO_2\rightarrow N_2+2H_2O[/tex]
From the balanced reaction, we conclude that
1 mole of [tex]NH_4NO_2[/tex] decomposes to give 1 mole of [tex]N_2[/tex] gas
2.16 moles of [tex]NH_4NO_2[/tex] decomposes to give 2.16 moles of [tex]N_2[/tex] gas
Now we have to calculate the pressure of the gas.
using ideal gas equation,
[tex]PV=nRT[/tex]
where,
P = pressure of the gas
V = volume of the gas
T= temperature of the gas
n = number of moles of gas
R = gas constant = 0.0821 Latm/moleK
Now put all the given values in ideal gas equation, we get pressure of the gas.
[tex]P=\frac{nRT}{V}=\frac{(2.16mole)\times (0.0821Latm/moleK)\times (298K)}{10L}=5.285atm[/tex]
Therefore, the pressure of the gas will be, 5.285 atm
Gastric acid pH can range from 1 to 4, and most of the acid is HCl.
For a sample of stomach acid that is 3.03x10^-2 M in HCl, how many moles of HCl are in 10.9 mL of the stomach acid?
The amount of HCl in a solution can be calculated by multiplying the solution's volume by its molarity. In the context of gastric acid with a molarity of 3.03x10^-2 M, there are approximately 3.3x10^-4 moles of HCl in 10.9 mL of the solution.
Explanation:The concentration of a solution is typically expressed in moles per liter (M), which denotes the amount of substance (in moles) present in one liter of the solution. When dealing with hydrochloric acid (HCl) in the context of gastric acid, a solution's molarity can be used to calculate the amount of HCl in a specific volume of the solution.
Given that the concentration of HCl in the gastric acid is 3.03x10^-2 M, there are 3.03x10^-2 moles of HCl in one liter of the solution. We are interested in finding out how many moles of HCl are present in 10.9 mL (or 0.0109 L) of the solution. This can be done by multiplying the volume of the solution by its molarity:
Moles of HCl = Volume in L x Molarity
Moles of HCl = 0.0109 L x 3.03x10^-2 M
So, the quantity of HCl in 10.9 mL of gastric acid is approximately 3.3x10^-4 moles.
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The number of moles of HCl in 10.9 mL of stomach acid that is 3.03x10^-2 M can be calculated using the concentration and volume. The result is 3.32x10^-4 moles of HCl.
Explanation:The stomach acid is primarily composed of HCl and has a pH range of 1 to 4. To determine the number of moles of HCl in 10.9 mL of stomach acid that is 3.03x10^-2 M in HCl, we can use the formula:
Moles of solute (HCl) = concentration (M) x volume (L)
Converting the volume of stomach acid from mL to L (10.9 mL = 0.0109 L) and substituting the given values into the formula:
Moles of HCl = 3.03x10^-2 M x 0.0109 L = 3.32x10^-4 moles
Therefore, there are 3.32x10^-4 moles of HCl in 10.9 mL of the stomach acid.
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What is the pressure of the gas in this mercury manometer if h = 53 mm and atmospheric pressure is 759 mmHg?
Given:
Atmospheric pressure = 759 mmHg
Height of manometer, h = 53 mm
To determine:
The gas pressure
Explanation:
The pressure of the gas can be calculated as follows-
P(gas) = P(atm ) + h
where: P(atm) is the atmospheric pressure
h = column height
P(gas) = 759 + 53 = 812 mmHg
Ans: The pressure of gas in the mercury manometer is 812 mmHg
An element consists of two isotopes. One with a mass of 79.95 amu and an abundance of 29.9%. The second isotope has a mass of 81.95 amu with an abundance of 70.1%. What is the molar mass of this element?
the molar mass of the element is 81.36 g/mol
calculation
step 1 : multiply each %abundance of the isotope by its mass number
that is 79.95 x 29.9 =2391
81.95 x 70.1 = 5745
Step 2: add them together
2390.5 + 5744.7 =8136
Step 3: divide by 100
= 8136/100 = 81.36 g/mol
A natural gas stove transforms R energy into P energy. What do R and P most likely represent?
A. R represents chemical energy, P represents thermal energy
B. R represents thermal energy, P represents chemical energy
C. R represents potential energy, K represents electrical energy
D. R represents electrical energy, K represents potential energy
Answer:
A. R represents chemical energy; P represents thermal energy.
Step-by-step explanation:
The molecules in the gas contain chemical energy (R).
When the gas burns, the chemical energy is released as heat, or thermal energy (P).
Answer:
A. R represents chemical energy; P represents thermal energy.
Explanation:
Draw a structural formula for an alkyne of molecular formula c8h14 that yields 3-ethylhexane on catalytic hydrogenation. click the "draw structure" button to launch the drawing utility.
If it an alkyne and gives 3-ethylhexane on hydrogenation then the reaction will be
There will be three isomers of alkyne with given molecular formula
The reactions are shown in the attached figure
Answer:
3-ethyl-1-hexyne or 4-ethyl-1-hexyne.
Explanation:
Hello,
By means of the more likely reagents to undergo the stated hydrogentation via catalysis with palladium or platinum, its structure is shown on the attached picture which is eligible for either 3-ethyl-1-hexyne or 4-ethyl-1-hexyne since they lead to the very same product. Do not forget that such hydrogenation covers up all the insaturations turning out into the specified alkane.
Best regards.
Jay had two clear liquids in bottles. The mass of one liquid was 10.2 grams and the other was 7.6 grams. When he mixed them, a yellow solid formed and settled to the bottom of the bottle. He predicted that the liquid plus the solid would have more mass, so he put the bottle on a scale. The mass was 17.8 grams. Why did the mass not change?
The reason the mass did not change because he did not add anything to the mixture accept the two liquids and its not possble to change the mass/ weight of any certain weighted item like the which is heavier the 1 pound of feathers or the 1 pound of bricks the only things is that the brick has more density so there for neither one is heavier than the other because the are both a pound
Final answer:
The mass did not change because mass is a conserved quantity.
Explanation:
The mass did not change because mass is a conserved quantity. In other words, mass cannot be created or destroyed during a chemical reaction. When Jay mixed the two liquids and a yellow solid formed, the total mass of the system remained the same.
When the two liquids were mixed, a chemical reaction occurred, resulting in the formation of a new substance (the yellow solid). However, the total mass of the reactant liquids and the product solid remained constant. This is known as the law of conservation of mass.
which elements does sulfate ion contain?
Answer: Sulphur and Oxygen
Explanation: Sulphate ion is [tex]SO_4^{2-}[/tex]. It is polyatomic ion which is formed by the combination of sulphur and oxygen elements in the ratio of 1:4.
It is negatively charged species and thus is named by the name _ate at the end.
It usually exists with positively charged species to get stable. eg: ferrous sulphate ([tex]FeSO_4[/tex])
A chemist takes 50-gram sample of sulfur powder that has a melting point of 115.2 °C. What is the melting point of a 100-gram sample of sulfur powder?
115.2 °C since melting point is an extensive property
115.2 °C since melting point is an intensive property
Double of 115.2 °C since melting point is an intensive property
Double of 115.2 °C since temperature is an extensive property
Answer:
115.2 °C since melting point is an intensive property
Step-by-step explanation:
The melting point of a substance does not depend on how much you have.
For example, the melting point of water is 0 °C, whether it is an ice cube from the refrigerator or in the frozen pond outside.
The freezing point of a substance is an intensive property.
Thus, the melting point of 100 g of sulfur is 115.2 °C because melting point in an intensive property.
In an experiment, 132 grams of potassium bromide was dissolved in 100 grams of water at 70°C in 1 minute. Which of the following will most likely happen if the sample of potassium phosphate is dissolved in 100 grams of water at 20°C?
1) the number of collisions between particles will increase
2) the number of collisions between particles will remain constant
3) a greater number of particles of the sample will dissolve in 1 minute
4) a fewer number of particles of the sample will dissolve in 1 minute
The correct answer is option 4, that is, a fewer number of particles of the sample will dissolve in 1 minute.
This is mainly because usually the solubility and the rate of solubility of the salts in water enhances with the increase in temperature, that is, the more the temperature, the faster and higher will be the number of particles that the water can dissolve. Therefore, at 70 degree Celsius more particles will get dissolved in water in 1 minute than at 20 degree Celsius.
Answer: its (4) a fewer number of particles of the sample will dissolve in 1 minute
Explanation:
got it right on my test
a graduated cylinder is filled to 10.0 mL with water and a piece of granite is placed in the cylinder, displacing the level to 23.7 mL. what is the volume of the granite piece in cubic centimeters
The equation for volume would be
9mm*2mm*2mm
If you put a piece of granite in a cylinder filled to 10ML, displacing the level to 23.7, the piece of granite would have a volume of 13.7
To find the volume of the granite piece in cubic centimeters, you can subtract the initial volume of the water-filled graduated cylinder (10.0 mL) from the final volume when the granite is added (23.7 mL).
Volume of granite = Final volume - Initial volume
Volume of granite = 23.7 mL - 10.0 mL = 13.7 mL
However, to express this volume in cubic centimeters (cm³), you need to convert milliliters to cubic centimeters because 1 mL is equivalent to 1 cm³.
Volume of granite in cm³ = 13.7 mL * (1 cm³ / 1 mL) = 13.7 cm³
So, the volume of the granite piece is 13.7 cubic centimeters. This means that the granite displaces 13.7 cm³ of water when placed in the graduated cylinder, as it takes up that much space within the cylinder.
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Wine goes bad soon after opening because the ethanol ch3ch2oh in it reacts with oxygen gas o2 from the air to form water h2o and acetic acid ch3cooh , the main ingredient of vinegar. what mass of acetic acid is produced by the reaction of 7.0g of oxygen gas?
Answer:
4.3 g
Explanation:
We know we will need a balanced equation with masses and molar masses, so let’s gather all the information in one place.
M_r: 60.05 32.00
CH₃CH₂OH + 3O₂ ⟶ 2CO₂ + 3H₂O
Mass/g: 7.0
1. Calculate the moles of O₂
Moles O₂ = 7.0 × 1/32.00
Moles O₂ = 0.219 mol O₂
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2. Calculate the moles of CH₃CH₂OH
The molar ratio is 1 mol CH₃CH₂OH:3 mol O₂
Moles of CH₃CH₂OH = 0.219 × 1/3
Moles of CH₃CH₂OH = 0.0729 mol CH₃CH₂OH
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3. Calculate the mass of CH₃CH₂OH
Mass of CH₃CH₂OH = 0.0729 × 60.05
Mass of CH₃CH₂OH = 4.4 g
when the equation N=O/P is solved for P correctly, the equation should read:
Given the equation N=O/P, solve for P by multiplying the left and right by P/N:
N * P/N = O/P * P/N
P = O/N
eqn N=O/P
solve for P
P=O/N
What does electron affinity depend on?
a. Only the effective nuclear charge
b. Both the effective nuclear charge and the number of shells in the atom containing electrons
c. Attraction between the valence electrons and core electrons
d. Attraction between the protons and neutrons
Electron affinity depends on both the effective nuclear charge and the number of electron shells an atom has, impacting how strongly the atom attracts additional electrons to complete its valence shell.
Explanation:Electron affinity depends on both the effective nuclear charge and the number of shells in an atom containing electrons. The effective nuclear charge is the net positive charge experienced by an electron in a multi-electron atom and influences how strongly the atom attracts additional electrons. The number of electron shells and whether these shells are full or not also impacts the atom’s electron affinity. A full valence shell leads to stability, reducing the likelihood of the atom attracting more electrons, whereas an incomplete valence shell increases reactivity and thereby the tendency to gain electrons and complete the shell.
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