Phases Regents Questions 1

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1. Which particle diagram best represents a substance in the solid state? *

2. Which particle diagram best represents a substance in the liquid state? *

3. Which particle diagram best represents a diatomic gas? *

4. The diagram below represents the uniform heating of a substance that is a solid at t .What is the freezing point of the substance? *

A) 100°C

B) 60°C

C) 1°C

D) 12°C

5. The graph below represents the relationship between temperature and time as heat was added uniformly to a substance, starting as a solid below its melting point.During the BC portion of the curve, the average kinetic energy of the molecules of the substance *

A) remains the same and the potential energy decreases

B) decreases and the potential energy increases

C) increases and the potential energy increases

D) remains the same and the potential energy increases

6. The graph below represents the relationship between temperature and time as heat is added uniformly to a substance, starting when the substance is a solid below its melting point.What portions of the graph represent times when heat is absorbed and potential energy increases while kinetic energy remains constant? *

A) C and D

B) B and D

C) A and B

D) A and C

7. The graph below represents uniform cooling of a sample of a pure substance, starting as a gas. The boiling point of the substance is *

A) 10°C

B) 60°C

C) 120°C

D) 180°C

8. Starting as a solid, a sample of a substance is heated at a constant rate. The graph below shows the changes in temperature of this sample.What is the melting point of the sample and the total time required to completely melt the sample after it has reached its melting point? *

A) 110°C and 4 min

B) 50°C and 5 min

C) 50°C and 3 min

D) 110°C and 14 min

9. The cooling curve below represents the uniform cooling of a substance, starting at a temperature above its boiling point.During which time interval does the substance exist as both a liquid and a solid? *

A) min 5 to min 7

B) min 7 to min 9

C) min 4 to min 5

D) min 2 to min 4

10. The graph below represents the uniform cooling of a substance starting as a gas at 160°C. At which temperature does a phase change occur for this substance? *

A) 40°C

B) 140°C

C) 0°C

D) 80°C

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