G. I am present in meteorites and in the sun. When pure, I am a strong, lustrous, white metal, with a low density. I have excellent corrosion resistance. I burn in air and am the only element that burns in
nitrogen. I am marvelous in fireworks. What am I, and what is my symbol?

Which of the following statements is true? a. most heat energy is easily recovered and used for useful actions. b. friction causes molecules to vibrate more slowly. burning air and gasoline in an c. engine changes chemical energy into mechanical energy. it is impossible to d. change mechanical energy into mechanical energy.