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2 Chemical Reaction
Vocabulary for Ch 2 Chemical Reactions
| Question | Answer |
|---|---|
| new substance | most important sign to look for to know that there is a chemical reaction |
| 4 signs of a chemical reaction | change in color, gas is produced, solid is produced, energy is given or taken |
| endothermic | energy is taken in by the chemical reaction |
| exothermic | energy is given off by the chemical reaction |
| 2 steps of a chemical reaction | 1) Bonds break 2) New bonds form |
| subscript | small lower number telling how many atoms there are of that element |
| coefficient | large number in the front which tells how many molecules there are |
| reactants | the atoms that are put together to react |
| products | the atoms that come out of a chemical reaction |
| law of conservation of mass | matter is never created or destroyed...it is only changed |
| 4 ways to speed up a chemical reaction | increase temperature, add a catalyst, increase concentration, increase surface area |
| rate of reaction | how quickly does the reaction take place |
| activation energy | the energy needed to start a chemical reaction |
| covalent compounds | two non-metals share electrons (H2O) |
| ionic compounds | a metal and a non-metal give/take electrons (NaCl) |
| Prefixes for 1, 2, 3, and 4 | mono, di, tri, tetra |
| synthesis | A + B --> AB |
| decomposition | AB --> A + B |
| single displacement | A + BC --> AC + B |
| double displacement | AB + CD --> AD + CB |
Created by:
browngdavid
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