# Glencoe Science Level Blue

## Chapter 21: Thermal Energy

### Standardized Test Practice

 1 At what point does the coolant in the refrigerator obtain energy needed to transfer heat to the room? (12.0K) A) compressor B) condenser coils C) expansion valve D) freezer unit 2 At what point does the coolant change to a gas? (12.0K) A) compressor B) expansion valve C) condenser coils D) freezer unit 3 Which term best describes the refrigerator? (12.0K) A) conductor B) heat engine C) heat mover D) heat pump 4 During which step in the four-stroke cycle of internal combustion engines does fuel enter the combustion chamber? A) compression B) exhaust C) power D) intake 5 A sample of each of the metals in the table above is formed into a 25-g cube. If 75 J of heat are applied to each of the samples, which metal would change temperature by the least amount? (3.0K) A) copper B) aluminum C) lead D) nickel 6 The difference in temperature of two glasses of water is 45°. What is their difference in temperature on the Kelvin scale? A) 135 K B) 228 K C) 318 K D) 45 K 7 Which of the following is true about hot chocolate and cold lemonade if they have the same volume? A) The molecules of the hot chocolate have more kinetic energy. B) The cold lemonade has a higher average kinetic energy. C) The hot chocolate has lower thermal energy. D) The molecules of the cold lemonade move faster. 8 A pizza should be baked at 425°F. What is this temperature on the Celsius scale? A) 254°C B) 707°C C) 218°C D) 733°C 9 Which of the following is an example of heat transfer by radiation? A) water moving in a pot of boiling water B) the warmth you feel sitting near a fire C) warm air rising from hot pavement D) the warmth you feel holding a cup of hot cocoa 10 Which is an example of thermal pollution? A) a soda bottle thrown into a river B) warm water added to a lake C) oil spilled into the ocean D) factory chemicals leaked into a river