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Chemistry
Rates of Reaction (Section 5)
| Question | Answer |
|---|---|
| What 2 things do rate of reaction depend on? | 1. Frequency of collisions 2. Energy transferred during a collision |
| What is the minimum amount of energy particles need to react called? | Activation energy |
| Why do particles need an activation energy? | To be able to break the bonds in the reactants and start the reaction |
| What 4 factors affect the rate of reaction? | 1. Temperature 2. Concentration/pressure 3. Surface area 4. Presence of catalyst |
| How does increasing temperature increase rate of reaction? | - Particles move faster --> more collisions - Increase energy of collisions - More successful collisions |
| How does increasing concentration/pressure increase rate of reaction? | More particles present in same volume --> collisions more likely --> rate increases |
| How does larger surface area increase rate of reaction? | Larger surface area to volume ratio --> surrounding particles have more area to work on --> frequency of collisions increase |
| What is a catalyst? | A substance which increases the rate of reaction without being chemically changed or used up |
| How do catalysts increase rate of reaction? | They decrease activation energy by providing an alternative reaction pathway of lower activation energy |
| What 3 experiments can you do to measure the rate of reactions? | 1. Precipitation 2. Change in mass 3. Volume of gas given off |
Created by:
JoeMather
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