Chapters 13 and 14 Chem test

A soltion containing 35 g of Li2SO4 dissolved in 100 g of water is heated from 10 degrees to 90 degrees. According to information in Figure 1, this temperature change would result in

5 g of Li2SO4 precipitating out of the solution

According to the saturation curves in Figure 1, which of the following solution is supersaturated?

80 g of NaCH3COO in 100 g of water at 40 degrees celcius

solute

A substance that is dissolved in a solution

How can you best increase the solubility of a gas in a liquid?

Decrease the temperature and increase the pressure

compared with a 1.00 M NaI solution, a 1.00 M Na2SO4 solution has

a boiling point elevation about 1.5 times as high

soluble

capable of being dissolved

holding the temperature constant while adding more solute to an already saturated solution that has solute crystals at the bottom of the container

causes more solute crystals to appear at the bottom of the container

If a crystal of a substance added to an aqueous solution dissolves, then the original solution containing that substance was supersaturated

never true

Oil and water are completely miscible

never true

the boiling point of a solution is always lower than that of the pure solvent.

never true

Colligative properties depend on the

number of solute particles present

If the reaction 2CO(g) + O2(g)<----> 2CO2(g) is at equilibrium, increasing the pressure will cause the

quantity of CO2(g) to increase

A chemical reaction in which products can react to re form reactants is

reversible

All of the KBr that will dissolve in a solution has dissolved, and several undissolved crystals remain on the bottom. The solution is...

saturated

a glass of iced tea containing excess sugar at the bottom is said to be

saturated

35 g of NaCl will dissolve in 100 mL of cold water, but 70 g will not. This observation implies that

solubility depends on the amounts of solute and solvent present

aqueous solution

solution with water as the solvent

the solubility of a solute can be increased by cooling the solvent.

sometimes true

solvent

substance that does the dissolving in a solution

If the addition of a crystal to an aqueous solution causes a great deal of dissolved solid to come out of solution, the original solution was

supersaturated

concentration

the amount of solute in a given amount of solvent or solution

molarity

the concentration of a solution expressed as the number of moles of solute dissolved in each liter of solution

An ionic compound has a solubility of 30 g per 100 mL of water at room temperature. A solution containing 70 g of the compound in 250 mL of water at the same temperature is

unsaturated

A concentrated solution is one in which there is a

large amount of solute in a small amount of solvent

Which of the following is NOT a stress on an equilibrium reaction?

maintaining volume

at equilibrium, the total amount of the products

may be equal to, greater than, or less than the total amount of the reactants

In which of the following reactions will an increase in pressure have no effect on the equilibrium of the system?

H2O(g) + CO(g) <-----> H2(g) + CO2

Of the following compounds,_______ would be the most effective in lowering the melting point of ice on roads.

K3PO4

If the reaction CH3OH(g) + 101 kJ <----> CO(g) + 2H2(g) is at equilibrium, increasing the temperature will cause the

[CH3OH] to decrease and the [CO] to increase

If the reaction 2CO(g) + O2(g)<----> 2CO2(g) is at equilibrium, adding more CO(g) will cause

[CO2] to increase and [O2] decrease

saturated solution

a solution containing as much dissolved solute as can possible be dissolved under existing conditions of temperature and pressure

supersaturated solution

a solution containing more solute particles than are needed to form a saturated solution

unsaturated solution

a solution that has less than the maximum amount of solute that can be dissolved

compared with a 0.01 M sugar solution, a 0.01 M KCl solution has

about twice the freezing point

by applying LeChatelier's principle to a reaction that has come to equilibrium, the reaction can be made to

all of these

which of the following operations tends to make a substance dissolve faster in a solvent?

all of these

100 mL of a 5.0 M sodium chloride solution is more concentrated than 1.0 L of a 1.0 M sodium chloride solution

always true

As an open bottle of carbonated beverage warms, the concentration of dissolved carbon dioxide decreases

always true

Grinding a solute increases the rate at which it would dissolve

always true

If the hydroxide ions were removed in the following equilibrium system, what will be the color change?

darker orange

the addition of anti freeze to water in a car radiator causes the freezing point of the mixture to

decrease

solution

homogeneous mixture of two or more substances in a single physical state