According to john dalton’s observations when elements combine in a compound a. the ratio of their masses is always the same b. each element contributes an equal number of atoms c. there volumes are always equal d. their masses are always equal

1) when you rub your hands together quickly, the kinetic energy is converted to mechanical energy.2) thermal energy from the sun travels to earth as infrared waves.3) energy is transferred through the matter of space by electromagnetic waves. 4) when a match is burned, chemical potential energy is converted to thermal and radiant energy. 5) seismicwaves are caused by back and forth movement , or vibration, of an object. 6) mechanicalenergy in an engine changes thermal energy into kinetic energy to make a car move.

You will hear a hissing sound because of the carbon dioxide escaping the can or bottle