| A | B |
|---|
| grow, ripen, decay, burn | words that describe chemical reactions you see every day |
| oxygen | humans inhale |
| carbon dioxide | humans exhale |
| chemical reactions | occur when substances undergo chemical changes to form new substances |
| signs of chemical reactions | production of gas, change of color, transfer of energy, a substance that has different properties than the reactants have |
| reactant | a substance or molecule that participates in a chemical reaction |
| product | a substance that forms in a chemical reaction |
| chemical energy | the energy released when a chemical compound reacts to produce new compounds |
| exothermic reaction | a chemcial reaction in which heat is released to the surroundings |
| endothermic reaction | a chemcial reaction that requires heat |
