Gases and Solutions Test

A balloon is filled with helium gas. For the questions that follow, select the letter of the balloon diagram that corresponds to given change in conditions. --The temperature is changed from 50 C to -150C at constant pressure. A b c

A

A gas at 5.00 atm pressure was stored in a tank during the winter at 5.0 °C. During the summer, the temperature in the storage area reached 40.0 °C. What was the pressure in the gas tank then? A: 5.63 atm B: 4.44 atm C: 0.625 atm D: 69.5 atm E: 40.0 atm

A

As you rise higher in Earth's atmosphere, the atmospheric pressure A: decreases. B: remains the same. C: increases

A

The solubility of KI is 50 g in 100 g of H 2O at 20 °C. If 110 grams of KI are added to 200 grams of H 2O, A: a saturated solution will form. B: the solution will start boiling. C: all of the KI will dissolve. D: the solution will be unsaturated. E: the solution will freeze.

A

What unit of temperature is used in gas law calculations? Kelvin A: Kelvin B: degrees Celsius C: degrees Fahrenheit D: either degrees Celsius or Kelvin E: either degrees Celsius or degrees Fahrenheit

A

Which solution is isotonic to a red blood cell? A: 0.9% NaCl B: 2% glucose C: water D: 10% glucose E: 0.5% NaCl

A

A red blood cell will undergo hemolysis in A: 5% NaCl. B: water. C: 10% glucose. D: 0.9% NaCl. E: 5% glucose.

B

For the question(s) that follow, consider a 4% starch solution and a 10% starch solution separated by a semipermeable membrane. Which starch solution will decrease in volume as osmosis occurs? A: 10% B: 4% C: Neither exerts osmotic pressure. D: They exert equal osmotic pressures. E: They exert opposite osmotic pressures.

B

How many grams of glucose are needed to prepare 400. mL of a 2.0%(m/v) glucose solution? A: 800. g B: 8.0 g C: 0.0050 g D: 2.0 g E: 200. g

B

What is the concentration, in mass percent, of a solution prepared from 50.0 g NaCl and 150.0 g of water? A: 40.0% B: 25.0% C: 3.00% D: 0.250% E: 33.3%

B

What volume would a 0.250 mole sample of H 2 gas occupy, if it had a which has a pressure of 1.70 atm, and a temperature of 35 °C? A: 1.25 L B: 3.72 L C: 0.269 L D: 283 L E: 0.423 L

B

Which of the following correctly describes the process of inspiration (air entering the lungs)? A: The lungs contract, causing their internal pressure to increase. B: The lungs expand, causing their internal pressure to decrease. C: The lungs contract, causing their internal pressure to decrease. D: The lungs expand, causing their internal pressure to increase. E: There is no change in the internal pressure in the lungs.

B

A patient needs to receive 85 grams of glucose every 12 hours. What volume of a 5.0%(m/v) glucose solution needs to be administered to the patient each 12 hours? A: 17 mL B: 60 mL C: 6000 mL D: 204 mL E: 1700 mL

E

A red blood cell will undergo crenation in A: 5% glucose. B: 3% glucose. C: 0.5% NaCl. D: water. E: 7% NaCl.

E

A tank contains a mixture of helium, neon, and argon gases. If the total pressure in the tank is 490. mmHg and the partial pressures of helium and argon are 215 mmHg and 102 mmHg, respectively, what is the partial pressure of neon? A: 603 mmHg B: 807 mmHg C: 377 mmHg D: 0.228 mmHg E: 173 mmHg

E

According to Henry's law, the solubility of a gas in a liquid A: remains the same as the temperature increases. B: decreases as the gas pressure above the liquid increases. C: depends on the liquid density. D: depends on the liquid polarity. E: increases as the gas pressure above the liquid increases

E

An autoclave is used to sterilize surgical equipment because A: it allows water to boil at 100 °C at pressures less than 1 atm. B: it allows water to boil at temperatures at 100 °C C: it allows water to boil at temperatures less than 100 °C. D: it provides very high temperatures and very low pressures. E: it allows water to boil at the temperature above 100 °C

E

An increase in the temperature of a solution usually A: decreases the solubility of a solid solute in the solution. B: increases the solubility of a gas in the solution. C: increases the boiling point. D: decreases the solubility of a liquid solute in the solution. E: increases the solubility of a solid solute in the solution.

E

In water, a substance that ionizes completely in solution is called a A: nonelectrolyte. B: weak electrolyte. C: nonconductor. D: semiconductor. E: strong electrolyte.

E

In water, a substance that partially ionizes in solution is called a A: nonelectrolyte. B: semiconductor. C: strong electrolyte. D: nonconductor. E: weak electrolyte.

E

The atmospheric pressure in Denver, CO is 633 mmHg. What is this pressure in atm? A: 633 atm B: 1.00 atm C: 1.20 atm D: 127 atm E: 0.833 atm

E

At STP, what is the volume of 4.50 moles of nitrogen gas? A: 3420 L B: 167 L C: 101 L D: 1230 L E: 60.7 L

C

For the question(s) that follow, consider a 4% starch solution and a 10% starch solution separated by a semipermeable membrane. The process that occurs in this system is A: neutralization. B: filtration C: osmosis D: hydration E: dialysis

C

In a gas, the distance between the particles is A: small relative to the size of the molecules. B: fixed relative to the size of the molecules. C: very large relative to the size of the molecules D: close relative to the size of the molecules E: very close relative to the size of the molecules

C

Oil does not dissolve in water because A: water is saturated. B: oil is polar. C: oil is nonpolar. D: water is nonpolar. E: oil is hydrated.

C

The volume of a gas with a pressure of 1.2 atm increases from 1.0 L to 4.0 L. What is he final pressure of the gas, assuming constant temperature? A: 4.8 atm B: 1.2 atm C: 0.30 atm D: 1.0 atm E: 3.3 atm

C

What is the molarity of a solution that contains 17 g of NH 3 in 0.50 L of solution? A: 34 M B: 0.029 M C: 2.0 M D: 0.50 M E: 1.0 M

C

Which measurement describes the pressure of a gas? A: 1.2 g/L B: 0.45 moles C: 725 mmHg D: 2.5 L E: 315 K

C

A gas sample in a closed, expandable container of initial volume 5.00 L was allowed to warm from 25 °C to 35 °C. What was its new volume? A: 4380 L B: 3.57 L C: 4.84 L D: 5.17 L E: 7.00 L

D

A solution is prepared by dissolving 2 g of KCl in 100 g of H 2O. In this solution, H 2O is the A: solute. B: solid. C: solution. D: solvent. E: ionic compound.

D

The boiling point of water at sea level is 100 °C. At higher altitudes, the boiling point of water will be A: higher, because there are fewer water molecules in the air. B: the same, because water always boils at 100 °C. C: lower, because temperatures are lower. D: lower, because the atmospheric pressure is lower. E: higher, because the altitude is greater.

D

The force of gas particles against the walls of a container is called A: density. B: temperature. C: volume. D: pressure E: quantity of gas

D