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| Question | Answer |
| Reaction Time | Time taken between a reaction starting and stopping |
| Reactant | Substance that takes part in a chemical reaction. |
| Excess | If a reactant is in excess there is enough of it to react with all of the other reactant(s). |
| Continuous Variable | A variable that can have any value, best displayed on a line graph |
| Rate of Reaction | The amount of product formed in fixed amount of time. In fast reaction more product is formed in a short time. Is the slope of a line on a product against time graph so it can be calculated by product/time. |
| Product | Substance produced in a chemical reaction |
| Gas Syringe | Measures the volume of gas produced in a reaction. |
| Limiting Reactant | The reactant that is used up first. |
| The amount of product formed is... | directly proportional to the limiting reactant. |
| Sucessful Collision | A collision that causes a reaction |