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| Chemical and physical properties | Whena chemical reaction occurs, there is always a change in________. |
| A reactant | The substance that always enters into a chemical reaction. |
| The Product | The substance that is produced by a chemical reaction. |
| Law of conservation of mass | Matter cannot be created nor destroyed. |
| A balanced equation | A chemical equation with the same number of atoms of each element on each side of the equal sign. |
| Synthesis reaction | Two or more substances combine to form a new, more complex subatance. |
| Decomposition reaction | A complex substance breaks down into two or more simpler substances. |
| Single replacement reaction | An uncombined element replaces an element that is part of a compound. |
| Double replacement reaction | When different atoms in two different compounds replace each other. |
| Exothermic reaction | When energy usually in the form of heat is released from a chemical reaction. |
| Endothermic reaction | When energy, usually heat is absorbed during a chemical reaction. |
| Activation energy | What is needed to start a chemical reaction. |
| Concentration, surface area, temperature, catalyst | Four factors the increase the rate of a chemical reaction. |
| Catalysts | A substance that increases the rate of a chemical reaction but does not undergo any change itself. |
| Collision Theory | The rate of reaction is affected by four factors: concentration, surface area, temperature and catalysts. |
