U3L11 PROPERTIES UNIT TEST
1. What of the following is an advantage of the thermal properties of plastic?
a. The thermal conductivity of plastic is very high, making it a good material to transmit heat.
b. Plastics are easy to mold into any shape.
c. Plastics are safe to use in microwave ovens.
d. Heating plastics eliminates the risk of BPA exposure
2. Which phase change is the opposite of boiling?
a. condensation
b. melting
c. evaporation
d. freezing
3. As the pressure of a gas decreases to half its original value, what happens to the volume of the gas if temperature is held constant?
a. The volume decreases to one-fourth of its original value.
b. The volume decreases to half of its original value.
c. The volume increases to twice its original value.
d. The volume increases to four times its original value.
4. There are 300 light particles in an airtight container. Which adjustment would increase the speed of the particles?
a. keeping the volume constant and replacing the light particles with heavy particles
b. keeping the pressure constant and increasing the temperature
c. keeping the temperature constant and increasing the container volume
d. keeping the volume constant and cooling the container
5. The relationships among which variable quantities are expressed by the ideal gas law equation?
a. volume, temperature, number of moles, gas constant
b. pressure, volume, temperature, number of moles
c. pressure, volume, number of moles, mass
d. pressure, volume, temperature, molar mass
6. When salt dissolves completely into water, which term is used to describe the water?
a. solute
b. concentration
c. solvent
d. solution
7. Which statement best describes what happens when oil and water are stirred together?
a. Water molecules will attract each other electrically, but they will not attract oil molecules, causing separation.
b. Oil and water molecules have like charges, causing them to repel each other and separate.
c. Oil molecules will repel each other electrically, leading to complete mixing of the two substances.
d. Water and oil molecules have opposite electrical charges, causing them to repel each other and separate.
8. Crystals are made using supersaturated solutions of solids in water. These solutions hold more of the solute than they would at room temperature. How are these solutions made?
a. The water would need to be heated to a higher temperature, which would give molecules and ions more kinetic energy, increasing solubility.
b. The water would need to be chilled to a lower temperature, which would take kinetic energy away from molecules and ions, increasing solubility.
c. The water would need to be chilled to a lower temperature, which would give molecules and ions more kinetic energy, increasing solubility.
d. The water would need to be heated to a higher temperature, which would take kinetic energy away from molecules and ions, increasing solubility.
9. Which substance is most likely to dissolve in greater quantities in cold water?
a. sodium chloride
b. oxygen
c. sugar
d. potassium chloride
10. How is a mole related to concentration?
a. The volume of particles of solute in a solution is measured in moles.
b. The number of particles of solute in a solution is measured in moles.
c. The mass of the solute in a solution is measured in moles.
d. The saturation point of a solution is measured in moles.
11. Which statement best describes what it means when something is classified as a strong acid?
a. It is present in large quantities in a solution.
b. It easily dissociates into ions in solution.
c. It resists dissociating into ions in solution.
d. It is present in low quantities in a solution.
12. Based on patterns in the periodic table, which list shows the acids in order from strongest to weakest?
a. H2S, PH3, HCI
b. HCI, H2S, PH3
c. HCI, PH3, H2S
d. PH3, H2S, HCI
13. What is the pH of a 1×10^−4 mol HCl solution?
a. 8
b. 6
c. 2
d. 4
14. A small amount of sodium hydroxide is added to water. When the chemical reaction reaches equilibrium, the pH is 12. Which statement and conclusion about sodium hydroxide is correct?
a. The negative log of the concentration of OH– ions is 2. Sodium hydroxide is a strong acid.
b. The negative log of the concentration of OH– ions is 12. Sodium hydroxide is a strong base.
c. The negative log of the concentration of OH – ions is 12. Sodium hydroxide is a strong acid.
d. The negative log of the concentration of OH– ions is 2. Sodium hydroxide is a strong base.
15. Ammonia is a weak base. Potassium hydroxide is a strong base. Which statement is correct?
a. A solution of potassium hydroxide will always have a lesser concentration of solute than a solution of ammonia.
b. A solution of potassium hydroxide will always have a higher pH than a solution of ammonia.
c. A solution of potassium hydroxide will always have more OH– ions than a solution of ammonia.
d. A solution of potassium hydroxide will always have greater conductivity than a solution of ammonia.
1. Plastics are easy to mold into any shape.
2. condensation
3. The volume increases to twice its original value.
4. keeping the pressure constant and increasing the temperature
5. pressure, volume, temperature, number of moles
6. solvent
7. Water molecules will attract each other electrically, but they will not attract oil molecules, causing separation.
8. The water would need to be heated to a higher temperature, which would give molecules and ions more kinetic energy, increasing solubility.
9. oxygen
10. The number of particles of solute in a solution is measured in moles.
11. It easily dissociates into ions in solution.
12. HCl, H2S, PH3
13. 4
14. The negative log of the concentration of OH– ions is 2. Sodium hydroxide is a strong base.
15. A solution of potassium hydroxide will always have a lesser concentration of solute than a solution of ammonia.
JS TOOK TEST ALL CORRECT TRUST!!
1. b. Plastics are easy to mold into any shape.
2. a. condensation
3. c. The volume increases to twice its original value.
4. b. keeping the pressure constant and increasing the temperature
5. b. pressure, volume, temperature, number of moles
6. c. solvent
7. a. Water molecules will attract each other electrically, but they will not attract oil molecules, causing separation.
8. b. The water would need to be chilled to a lower temperature, which would take kinetic energy away from molecules and ions, increasing solubility.
9. c. sugar
10. b. The number of particles of solute in a solution is measured in moles.
11. b. It easily dissociates into ions in solution.
12. b. HCI, H2S, PH3
13. c. 2
14. b. The negative log of the concentration of OH– ions is 12. Sodium hydroxide is a strong base.
15. b. A solution of potassium hydroxide will always have a higher pH than a solution of ammonia.
Great job! It seems like you have answered all the questions correctly. Well done!
1. b. Plastics are easy to mold into any shape.
2. a. condensation
3. c. The volume increases to twice its original value.
4. b. keeping the pressure constant and increasing the temperature
5. b. pressure, volume, temperature, number of moles
6. c. solvent
7. a. Water molecules will attract each other electrically, but they will not attract oil molecules, causing separation.
8. b. The water would need to be chilled to a lower temperature, which would take kinetic energy away from molecules and ions, increasing solubility.
9. c. sugar
10. b. The number of particles of solute in a solution is measured in moles.
11. b. It easily dissociates into ions in solution.
12. d. PH3, H2S, HCI
13. c. 2
14. b. The negative log of the concentration of OH– ions is 12. Sodium hydroxide is a strong base.
15. c. A solution of potassium hydroxide will always have more OH– ions than a solution of ammonia.