2020 Mod 10

Question 1

When you dissolve sodium fluoride in water, which compound is a solute and which compound is the solvent?

Answer 1

The solute equals sodium fluoride the solvent equals water

Question 2

What happens to ionic compound when they dissolve?

Answer 2

They split into their constituent ions

Question 3

What happens to polar covalent molecules when they dissolve

Answer 3

They dissolve one molecule at a time

Question 4

What is wrong with this statement: it does not matter what’s the solvent is in determining the solubility

Answer 4

It’s wrong because it does matter what solvent it is. Each solvent dissolves differently in each solvent

Question 5

Solubility

Answer 5

The maximum amount of solute that can dissolve in a given amount of solvent

Question 6

What does solubility depend on?

Answer 6

The solubility of any solute depends on both the identity of the solute and the identity of the solvent

Question 7

What is the definition of a saturated solution

Answer 7

A solution in which the maximum amount of solute has been dissolved

Question 8

What is the definition of precipitation in chemistry

Answer 8

The process by which a solid solid leaves a solution and turns back into a solid phase

Question 9

What kind of solute solid liquid or gas deserves the best under high temperature conditions

Answer 9

Solid

Question 10

What kind of solute solid liquid or gas dissolves best under high-pressure conditions

Answer 10

Gas

Question 11

What kind of solid solid liquid or gas has the solubility there is this affected by the conditions under which the solution is made

Answer 11

Liquid

Question 12

If a solid Solute is not dissolving well in water what can you do to increase it solubility

Answer 12

Increase the temperature of the solution

Question 13

If a gas solute is not dissolving well and water what can you do to increase it solubility

Answer 13

You can either increase the pressure and or decrease the temperature

Question 14

If a chemist makes a solution in the beaker using water and saw you did the sauce endothermic live in water would you Expect the beaker to feel hot or cold

Answer 14

Cold

Question 15

What is the definition of an exothermic process?

Answer 15

A process that releases heat

Question 16

What is the definition of an endothermic process?

Answer 16

A process that absorbs heat

Question 17

What is the definition of molarity

Answer 17

A concentration unit that tells how many moles of a substance or in a liter of solution. It is determined by dividing the number of moles of a substance by the numbers of liters of a solution.

M Equal number of moles over number of liters

Question 18

What is the definition of molality (m)

Answer 18

The number of moles of a solute per kilograms of solvent.

m = Number of moles solute over number kg solvent

Question 19

If you wanted to protect water from freezing, which compound would accomplish the best: NaNO3, Mg(NO3)2, or Al(NO3)3

Answer 19

Al(NO3)3

Yes please because when it splits into it I and it has the most. The more ions the bigger i is. Bigger i equals larger freezing point depression

Question 20

What is the freezing point depression constant

Answer 20

It is a physical constant that depends solely on the chemical nature of the solvent

Question 21

What is the boiling point elevation

Answer 21

When a solute is dissolved in a solvent the boiling point of the resulting solution is higher than that of the pure solvent

Question 22

What is the equation for the freezing point depression

Equation 10.2

Answer 22

Triangle (Delta/Change in) T = -i • Kf • m

Question 23

What is the equation for boiling point elevation?

Equation 10.3

Answer 23

Triangle (Delta/Change in) T = i • Kb • m

Question 24

What are the requirements for dissolving for a solid

Answer 24

The solvent molecules must be attracted to the solute molecules so strongly that the solvent molecules can get between the solute molecules or ions and pull them far apart from each other

Question 25

What are the requirements for dissolving for a liquid

Answer 25

The solvent molecules need to be attracted to the solute molecules only a small amount because the solvent does not need to separate the solute molecules very much. The solvent merely needs to get between the solute molecules

Question 26

What are the requirements for the dissolving of a gas

Answer 26

The solvent molecules must be attracted to the solute now kills enough to pull the solute molecules closer to one another

Question 27

What is the rules for the effect of temperature in the solubility of a solid

Answer 27

The solubility of a solid solute usually increases with increasing temperatures

Question 28

What are the rules for the effect of temperature on the solubility of a liquid

Answer 28

The solubility of a liquid solute is not affected by temperature

Question 29

What is the rules for the effect of temperature on the solubility of gas

Answer 29

The solubility of gases decreases with increasing temperatures

Question 30

What is the Factive pressure increases on the solubility of gas

Answer 30

As the pressure increases so does the solubility of gas is

Question 31

Does increasing pressure affect any other phase?

Answer 31

No