Chem CH 13

The fact that the oceans contain salt water shows that polar solvents dissolve ionic solutes.

True

The solubility of gases in water decreases with increasing temperature.

True

The solubility of gases in water increases with increasing pressure above the water.

True

The solubility of solids in water generally increases with increasing temperature.

True

Upon completing a dilution from a stock solution, you will always have more volume of solution than you started with and it will have a lower concentration than the stock solution.

True

Vitamin C is a water-soluble vitamin, so it is likely that this vitamin is polar

True

Warm beer goes flat quicker than cold beer.

True

Molality is calculated by dividing grams of solute by kilograms of solution.

False

One liter of 6.0 M HNO3 contains the same number of H+ ions as does one liter of 6.0 M H2SO4

False

Osmotic pressure is the pressure required to completely reverse the direction of solvent movement in osmosis.

False

Solubility is formally defined as the amount of a compound that can be dissolved in water.

False

Sugar solutions conduct electricity because the dissolved particles are molecules.

False

Which of these compounds would you expect to be least soluble in water? A) CH3OH B) NaCl C) N2 D) NH3 E) not enough information solutions.

C) N2

When preparing sodium hydroxide solution, it is best to use water that does not contain any dissolved carbon dioxide as it reacts with the sodium hydroxide. Removing the carbon dioxide can be accomplished by: A) vigorously stirring the solution. B) using water fresh out of the purification system. C) boiling the water. D) Nothing can be done to remove dissolved gases. E) none of the above

C) boiling the water.

The solubility of gases in water: A) is independent of temperature. B) increases with increasing temperature. C) decreases with increasing temperature. D) gases are not soluble in water. E) none of the above aboveankI{

C) decreases with increasing temperature.

If 50g of salt dissolves in 250 grams of water, the resulting solution must have a mass of 300 grams

True

If you put a living cell into seawater containing a higher concentration of sodium chloride, the cell loses water through osmosis

True

Salt water is an example of a strong electrolyte solution.

True

The solubility of solids in water: A) is independent of pressure above solution. B) increases with increasing pressure above solution. C) decreases with increasing pressure above solution. D) Solids are not soluble in water. E) none of the abovel>

A) is independent of pressure above solution.

Steel is an example of a solid solution

True

If the solubility of sodium chloride is 36 grams per 100 grams of water, which of the following solutions would be considered unsaturated? A) 5.8 moles of NaCl dissolved in 1 L of water B) 3.25 moles of NaCL dissolved in 500 ml of water C) 1.85 moles of NaCl dissolved in 300 ml of water D) none of the above>evancyR

A) 5.8 moles of NaCl dissolved in 1 L of water

Tap water contains dissolved nitrogen and oxygen.

True

The oxygen in the air we breath is classified as: A) the solute in a homogeneous gas mixture. B) the solvent in a homogeneous gas mixture. C) the solute in a heterogeneous gas-liquid mixture. D) the solvent in a simple mixture. E) none of the above

A) the solute in a homogeneous gas mixture.

In order for a solute to dissolve in solution: A) the solute-solvent forces must be greater than the solute-solute forces. B) the solute-solute forces must be greater than the solute-solvent forces. C) the solute-solvent forces must equal the solute-solute forces. D) the polarity of the solute and solvent must be opposite. E) none of the above

A) the solute-solvent forces must be greater than the solute-solute forces.

If the solubility of sodium acetate (Molar mass = 82 g/mol) is 76 grams per 100 grams of water, which of the following solutions would be considered supersaturated? A) 8.5 moles of sodium acetate dissolved in 1 L of water B) 5.5 moles of sodium acetate dissolved in 500 mL of water C) 1.8 moles of sodium acetate dissolved in 300 mL of water D) 1.2 moles of sodium acetate dissolved in 200 mL of water E) none of the above

B) 5.5 moles of sodium acetate dissolved in 500 mL of waters.kix

Which compound below forms an electrolyte solution when dissolved in water? A) Cl2 B) KOH C) CH3CH2OH D) C12H22O11 (sucrose) E) none of the above

B) KOH

A solution is saturated in both nitrogen gas (N2) and sodium iodide (NaI) at 50�C. When the solution is cooled to 25�C, which of the following is most likely to occur? A) Some nitrogen gas bubbles out of solution. B) Some sodium iodide will precipitate out of solution. C) Both A and B will happen. D) Nothing will happen. E) not enough informationy> </html>

B) Some sodium iodide will precipitate out of solution.

Suppose a vodka martini contains 30% alcohol with the remaining portion of the drink composed of water. What is the solute in this type of martini? A) water B) alcohol C) ice D) olive E) none of the above

B) alcohol

Solubility of gases in water: A) is independent of pressure above solution. B) increases with increasing pressure above solution. C) decreases with increasing pressure above solution. D) Gases are not soluble in water. E) none of the abovevel>

B) increases with increasing pressure above solution.

The solubility of solids in water: A) is independent of the temperature. B) increases with increasing temperature. C) decreases with increasing temperature. D) Solids are not soluble in water. E) none of the aboveankI{

B) increases with increasing temperature.

Hexane, a nonpolar solvent, will dissolve which of the following substances? A) sodium chloride B) oil C) ammonium acetate D) vinegar (acetic acid) E) none of the above

B) oil

If you prepare a solution by adding sufficient amount of solute so that after heating and cooling the solution there is a visible amount of solid solute left in the bottom of the beaker, the solution would be considered ________. A) unsaturated B) saturated C) supersaturated D) thermally saturated E) none of the above

B) saturated

The solubility of Pb(NO3)2 is 55 grams per 100 g H2O at 20C. Which term would properly describe a solution where 44 grams of Pb(NO3)2 is added to 100 grams of water at this temperature? A) insoluble B) unsaturated C) saturated D) supersaturated E) none of the above>

B) unsaturated

Which of the following substances is NOT a solution? A) humid air B) beer C) oxygen D) steel E) All of the above are solutions

C) oxygen

The tragedy at Lake Nyos in Cameroon, West Africa, was caused by: A) the release of excessive amounts of nitrogen gas that had been dissolved in the water at the bottom of the lake. B) the release of excessive amounts of oxygen gas that had been dissolved in the water at the bottom of the lake. C) the release of excessive amounts of carbon dioxide that had been dissolved in the water at the bottom of the lake. D) the release of excess water stored in the volcanic lake which flooded the village below. E) none of the above

C- The release of excessive amounts of carbon dioxide that had been dissolved in the water at the bottom of the lake

The major component in a solution is called the solute.

False

The minor component in a solution is called the solvent.

False

The molarity of a solution prepared by dissolving 15.0g of NaCl in 1000 mL water is 0.15M.

False

The terms "molarity"and "molality" are considered identical and can always be used interchangeably.

False

The tragedy at Lake Nyos in Cameroon, West Africa was due to the sudden release of excessive amounts of nitrogen dissolved in the lake water.

False

When a chunk of gold is melted and poured into the shape of an ingot, an aqueous solution of gold has been created.

False

he tragedy at Lake Nyos in Cameroon, West Africa, was due to the sudden release of excessive amounts of carbon monoxide dissolved in the lake water.

False

Which of the following compounds is a strong electrolyte? A) C6H12O6 B) C7H14O5 C) C4H8O2 D) NaC2H3O2 E) all of the above

D)

Which of the following substances is NOT a solution? A) air B) brass C) vodka D) copper E) All of the above are solutions

D) copper

When an ionic compound dissolves in water: A) the solvent-solute attractive forces overcome the solute-solute attractions. B) the positive end of water dipoles attract the negative ions. C) the negative end of water dipoles attract the positive ions. D) each of the above (A, B, and C) occurs. E) none of the above (A, B, or C) occurs. the above�

D) each of the above (A, B, and C) occurs.

The solubility of a gas in a liquid can always be increased by: A) increasing the temperature of the solvent. B) decreasing the polarity of the solvent. C) decreasing the pressure of the gas above the solvent. D) increasing the pressure of the gas above the solvent. E) none of the above/html>releva

D) increasing the pressure of the gas above the solvent.

Colligative properties are independent of the amount of solute in solution.

False

Which of the following substances is NOT a solution? A) homogenized milk B) bronze C) sea water D) soda E) All of the above are solutions.

E) All of the above are solutions.

Which of the following compounds is a strong electrolyte? A) HCl B) NaCl C) NH4CL D) NaC2H3O2 E) all of the above

E) all of the above

Ionic solutes typically dissolve in nonpolar solvents.

False

Which among the following is NOT true about the solubility of a solid in water? A) The solubility is not affected by pressure. B) The solubility generally increases as temperature increases. C) Solid crystallizes when a saturated solution is prepared at a higher temperature and then cooled. D) A saturated solution prepared at a lower temperature becomes unsaturated when heated to a higher temperature. E) none of the above

E) none of the above

A sample of salt water will freeze at a higher temperature than a sample of pure water.

False

A semipermeable membrane allows only half the amount of a substance to pass through it.

False

A solution that is 35 percent by mass NaCl contains 35g of NaCl dissolved in 100g of water.

False

A sugar solution is an example of a weak electrolyte solution.

False

Adding a nonvolatile solute to a liquid will cause boiling point depression and freezing point elevation.

False

It would be expected that methanol (CH3OH) would be more soluble in water than methane (CH4) would be.

True

Molarity is defined as the moles of solute per liter of solution.

True

One liter of a 2.0 M NaOH (aq) solution contains the same number of Na+ ions as does one liter of a 1.0 M Na2CO3 (aq) solution

True

Osmosis is the process in which a solvent moves from an area of low solute concentration to an area of high solute concentration.

True

A 0.10 molality solution of the sugar glucose (molecular weight = 180.10 g/mol) and a 0.10 molality solution of sucrose (molecular weight = 342.34 g/mol) would both boil at the same temperature.

True

A saturated solution holds the maximum amount of solute under the solution conditions.

True

A solution is a homogeneous mixture of two or more substances.

True

A solution that is 13.58 percent by mass of sugar contains 13.75g of sugar dissolved in 87.5g of water.

True

A stock solution is a more concentrated form than what is typically used in a lab. It often requires further dilution.

True

A supersaturated solution is unstable and crystallization usually occurs.

True

Air is an example of a gaseous solution.

True