Question: You have a block of dry ice (-40°C), an ice cube (-5°C), water (10°C), and alcohol (15°C). In which one do molecules move the fastest?

Answer: Alcohol

Question: You place a block of dry ice (-40°C) in contact with an ice cube (-10°C). Assuming no chemical reactions occur, which of the following will happen?

Answer: Heat will flow from the ice cube to the dry ice.

Question: You boil a stone in 100°C water for one hour. You remove it and place it in air that is 21°C. Which of the following explains what happens?

Answer: The slower- moving molecules of air collide with the rapidly vibrating stone molecules. The air molecules gain energy raising the air temperature.

Question: Which of the following is the transfer of energy?

Answer: Heat

Question: Which of the following amounts of energy raises one gram of water by one degree Celsius?

Answer: 1 Cal