1. C. Encircle the letter of the correct answer. When you sit in front of an open fire, what means of heat transfer makes you warm? convection and radiation b. conduction and radiation convection and conduction d. conduction, convection, and radiation 2. When you stir a cup of hot chocolate, why does a metal teaspoon always feel hotter than a plastic one? metal has greater density b. metal is a better heat radiator metal is a better heat conductor d. metal is at a higher temperature 3. Which of the following is an insulator? a. aluminum C. glass b. copper d. silver 4. What kind of heat transfer can occur in empty space? a. conduction c. insulation b. convection d. radiation 5. How is heat energy distributed in a domestic hot water system? a. by radiation c. by conduction b. by convection d. by insulation​