17.Define temperature: a measure of how hot or cold an object is compared to a reference point. 18.As the temperature of an object increases what happens to the thermal energy? The thermal energy increases. 19.The specific heat of copper is 0.385 J/g°C. What is the energy needed to heat 2.75 g of copper from 14°C to 35°C? 20. Describe the three ways energy transfers. a. Conduction – the transfer of thermal energy as a result of direct contact (touching); requires matter. b. Convection – the transfer of thermal energy through fluids such as liquids and gases; requires matter. c. Radiation – the transfer of thermal energy by waves moving through space; does not require matter. 21.Which method of energy transfer does not need matter? Radiation 22.Which method(s) of energy transfer needs matter? Conduction and Convection 23.Define conductor. A conductor is a material that transfers thermal energy easily. Metals are good conductors. 24. Give two examples of conductors: Metals such as copper, silver, gold, and iron. 25. Define insulator. An insulator is a material that is a poor conductor because it doesn’t transfer thermal energy well. Plastic and wood are good insulators. 26. Give two examples of insulators: Rubber, plastic, wood, paper, fleece, fiber glass.