| A | B |
|---|
| reactant | at the left of the formula seperated by a plus sign |
| chemical equation | an expression taht uses sumbols to describe a chemical reation |
| products | new substances formed |
| coefficients | numbers taht indicate how mnay atoms or colecules of a substance that are involved in a reation |
| synthesis reaction | when two simple substances combine to form a third, more complex substance |
| decomposition reaction | a single reactant breaks down into elements or simpler compounds |
| single-repacement reaction | atoms of one elembent replace atoms of another element in a compound |
| double-replacement reaction | two positive ions trade places between different ionic compounds |
| activation energy | start up energy needed to help out a reaction |
| catalyst | all that is necessary is to add a small amoutn of a substance that speeds up a reation without being used up itn the process |
| chemical reaction | when chemical bonds between atoms or ions break, and new bonds form between differnt atoms or ions |
| exothermic reaction | reaction that releases energy |
| endothermic reaction | reaction that absorbs energy |
| evidence for chemical reactions | precipitat, color change, release of energy, gas formation |
| reaction rate | things that affect this are: temperatre, surface area, concentration |
