| A | B |
|---|
| physical change | alters the form or appearance of matter but dofes not turn any substance in the matter into a different substance |
| A substance that undergoes a physical change is... | ... still the same substance after the change |
| chemical change | a change in mater that produces one or more new substances |
| combustion | chemical change that occurs when fuels, such as natural gas, candle wax, or wood, burn in air |
| law of conservation of mass | matter is not created or destroyed in any chemical or physical change |
| energy | every chemical and physical change in matter includes a change in ____________ |
| temperature | a measure of how hot or cold something is |
| thermal energy | total energy of the motion of all of the particles in an object |
| endothermic change | a change in which energy is absorbed |
| chemical energy | the energy stored in the chemical bonds between atoms is a form of energy called _____________ |
| exothermic change | ______ releases energy. Combustion is a chemical change that releases thermal energy and light |
