1.  During the phase change from solid to liquid, the temperature of the sample
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1. During the phase change from solid to liquid, the temperature of the sample a)increases b)decreases c)doubles d)halves e)does not change. a) increases. 2. The process of melting the solid sample is an ________________ process. a)endothermic b)exothermic

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1. During the phase change from solid to liquid, the temperature of the sample a)increases

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1 during the phase change from solid to liquid the temperature of the sample a increases

1. During the phase change from solid to liquid, the temperature of the sample

a)increases

b)decreases

c)doubles

d)halves

e)does not change


1 during the phase change from solid to liquid the temperature of the sample a increases

  • a) increases


1 during the phase change from solid to liquid the temperature of the sample a increases

2. The process of melting the solid sample is an ________________ process.

a)endothermic

b)exothermic

c)neither, energy is not created nor destroyed


1 during the phase change from solid to liquid the temperature of the sample a increases

2. The process of melting the solid sample is an ________________ process.

a)endothermic

b)exothermic

c)neither, energy is not created nor destroyed


1 during the phase change from solid to liquid the temperature of the sample a increases

3. During the condensation of the water vapor to water, heat is _________ by the system.

a)gained

b)lost

c)neither


1 during the phase change from solid to liquid the temperature of the sample a increases

  • 3. During the condensation of the water vapor to water, heat is _________ by the system.

  • a)gained

  • b)lost

  • c)neither


1 during the phase change from solid to liquid the temperature of the sample a increases

4. The vaporization of water is a _______________________ process.

a)slow

b)exothermic

c)endothermic

d)boring


1 during the phase change from solid to liquid the temperature of the sample a increases

  • 4. The vaporization of water is a _______________________ process.

  • a)slow

  • b)exothermic

  • c)endothermic

  • d)boring


1 during the phase change from solid to liquid the temperature of the sample a increases

5. Which of the following is an exothermic process?

a)Candle wax melting

b)A puddle evaporating

c)Dry ice (solid CO2) subliming to form gaseous CO2

d)Water freezing to form ice


1 during the phase change from solid to liquid the temperature of the sample a increases

  • 5. Which of the following is an exothermic process?

  • a)Candle wax melting

  • b)A puddle evaporating

  • c)Dry ice (solid CO2) subliming to form gaseous CO2

  • d)Water freezing to form ice


1 during the phase change from solid to liquid the temperature of the sample a increases

6. A measure of the average kinetic energy of the particles in a sample of matter is

a.heat

b.enthalpy

c.temperature

d.energy

e.both


1 during the phase change from solid to liquid the temperature of the sample a increases

  • 6. A measure of the average kinetic energy of the particles in a sample of matter is

  • a.heat

  • b.enthalpy

  • c.temperature

  • d.energy

  • e.both


1 during the phase change from solid to liquid the temperature of the sample a increases

7. As ice cools from 0oC to -10oC, the average kinetic energy of its molecules will ________________________.

a. decrease

b. increase

c. remain the same


1 during the phase change from solid to liquid the temperature of the sample a increases

  • 7. As ice cools from 0oC to -10oC, the average kinetic energy of its molecules will ________________________.

  • a. decrease

  • b. increase

  • c. remain the same


1 during the phase change from solid to liquid the temperature of the sample a increases

8. Water has a ____________________ specific heat, which allows it to heat and cool slowly.

a.high

b.low


1 during the phase change from solid to liquid the temperature of the sample a increases

  • 8. Water has a ____________________ specific heat, which allows it to heat and cool slowly.

  • a.high

  • b.low


1 during the phase change from solid to liquid the temperature of the sample a increases

9. Solid X is placed in contact with solid Y. Heat will flow spontaneously from X to Y when _______________________.

a. X is 20°C and Y is 20°C

b. X is 10°C and Y is 5°C

c. X is -25°C and Y is -10°C

d. X is 25°C and Y is 30°C


1 during the phase change from solid to liquid the temperature of the sample a increases

  • 9. Solid X is placed in contact with solid Y. Heat will flow spontaneously from X to Y when _______________________.

  • a. X is 20°C and Y is 20°C

  • b. X is 10°C and Y is 5°C

  • c. X is -25°C and Y is -10°C

  • d. X is 25°C and Y is 30°C


1 during the phase change from solid to liquid the temperature of the sample a increases

10. Compared to 100 g of iron, a 10-g sample of iron has ____________.

a. a higher specific heat

b. a lower specific heat

c. the same specific heat


1 during the phase change from solid to liquid the temperature of the sample a increases

  • 10. Compared to 100 g of iron, a 10-g sample of iron has ____________.

  • a. a higher specific heat

  • b. a lower specific heat

  • c. the same specific heat


1 during the phase change from solid to liquid the temperature of the sample a increases

11.When a 37.5 gram sample of an unknown metal cools from 77 ˚C to 23 ˚C, 560 J of energy is released. Find the specific heat capacity of the unknown metal.

a)0.149 J/g˚C

b)2.28 J/g˚C

c)0.277 J/g˚C

d)16.1 J/g˚C


1 during the phase change from solid to liquid the temperature of the sample a increases

  • 11.When a 37.5 gram sample of an unknown metal cools from 77 ˚C to 23 ˚C, 560 J of energy is released. Find the specific heat capacity of the unknown metal.

  • a)0.149 J/g˚C

  • b)2.28 J/g˚C

  • c)0.277 J/g˚C

  • d)16.1 J/g˚C


1 during the phase change from solid to liquid the temperature of the sample a increases

12.How much heat is absorbed when a 15.8 g sample of potassium with c = 0.75 J/g˚C changes temperature by 14˚C?

a)51.7 J

b)165.9 J

c)106.6 J

d)4.245 J


1 during the phase change from solid to liquid the temperature of the sample a increases

  • 12.How much heat is absorbed when a 15.8 g sample of potassium with c = 0.75 J/g˚C changes temperature by 14˚C?

  • a)51.7 J

  • b)165.9 J

  • c)106.6 J

  • d)4.245 J


1 during the phase change from solid to liquid the temperature of the sample a increases

13.A chunk of iron (CFe = 0.46 J/g˚C) at 90˚C is added to a calorimeter containing 150 g of water at 23˚C. The final temperature of the system is 31˚C. What was the mass of the iron?

a)189.1 g

b)1.005 g

c)166.5 g

d)124.0 g


1 during the phase change from solid to liquid the temperature of the sample a increases

  • 13.A chunk of iron (CFe = 0.46 J/g˚C) at 90˚C is added to a calorimeter containing 150 g of water at 23˚C. The final temperature of the system is 31˚C. What was the mass of the iron?

  • a)189.1 g

  • b)1.005 g

  • c)166.5 g

  • d)124.0 g


1 during the phase change from solid to liquid the temperature of the sample a increases

14. A sample of 2.8 grams of water is cooled from 105°C to -6°C. How much heat is lost from the sample?

∆H fusion = 333.5 J/g

∆H vap = 2260 J/g

C solid = 2.1 J/g°C

C liquid = 4.184 J/g°C

C vapor = 1.7 J/g°C

a)1299.144 J

b)1632.76 J

c)2259.04 J

d)8492.4 J


1 during the phase change from solid to liquid the temperature of the sample a increases

  • 14. A sample of 2.8 grams of water is cooled from 105°C to -6°C. How much heat is lost from the sample?

  • ∆H fusion = 333.5 J/g

  • ∆H vap = 2260 J/g

  • C solid = 2.1 J/g°C

  • C liquid = 4.184 J/g°C

  • C vapor = 1.7 J/g°C

  • a)1299.144 J

  • b)1632.76 J

  • c)2259.04 J

  • d)8492.4 J


1 during the phase change from solid to liquid the temperature of the sample a increases

15. A light bulb filament made of tungsten has a mass of 1 g and has a temperature of 1500 C. Calculate the amount of heat released when the filament is cooled to 20 C. The specific heat capacity of tungsten is 0.142 J/g C.

a) 210.16 J

b) 10563.4 J

c) 1500.142

d) 20.142


1 during the phase change from solid to liquid the temperature of the sample a increases

  • 15. A light bulb filament made of tungsten has a mass of 1 g and has a temperature of 1500 C. Calculate the amount of heat released when the filament is cooled to 20 C. The specific heat capacity of tungsten is 0.142 J/g C.

  • a) 210.16 J

  • b) 10563.4 J

  • c) 1500.142

  • d) 20.142


1 during the phase change from solid to liquid the temperature of the sample a increases

16. When natural gas (methane, CH4) is burned, 891.2 kJ of heat is produced as follows:

CH4 + 2 O2 ----> CO2 + 2 H2O + 891.2 kJ

How much heat will be produced by the burning of 454 grams of natural gas?

a) 404604.8 kJ

b) 25287.8 kJ

c) 1.96 kJ

d) 1345.2 kJ


1 during the phase change from solid to liquid the temperature of the sample a increases

  • 16. When natural gas (methane, CH4) is burned, 891.2 kJ of heat is produced as follows:

  • CH4 + 2 O2 ----> CO2 + 2 H2O + 891.2 kJ

  • How much heat will be produced by the burning of 454 grams of natural gas?

  • a) 404604.8 kJ

  • b) 25287.8 kJ

  • c) 1.96 kJ

  • d) 1345.2 kJ


1 during the phase change from solid to liquid the temperature of the sample a increases

17. When baking soda decomposes, the reaction is

2NaHCO3 (s) ----> Na2CO3 (s) + H2O (g) + CO2 (g) H = 129 kJ

Determine the mass of baking soda that will decompose when 65.3 kJ of energy are applied to the system.

a)63.7 g

b)184 g

c)85 g

d)1.98 g


1 during the phase change from solid to liquid the temperature of the sample a increases

  • 17. When baking soda decomposes, the reaction is

  • 2NaHCO3 (s) ----> Na2CO3 (s) + H2O (g) + CO2 (g) H = 129 kJ

  • Determine the mass of baking soda that will decompose when 65.3 kJ of energy are applied to the system.

  • a)63.7 g

  • b)184 g

  • c)85 g

  • d)1.98 g


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