Question 4 of 10 A student measures the time it takes for two reactions to be completed. Reaction A is completed in 12 seconds, and reaction B is completed in 21 seconds. What can you conclude about the rates of these reactions? O A. The rate of reaction B is lower. OB. The rate of reaction A is lower. C. The rates of reactions A and B are equal. SUBMIT​

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.