Chemistry - OCR - Mindmap 2
- Created by: lala2127
- Created on: 10-06-18 17:13
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- Chemistry
- Controlling chemical reactions
- Rate of reaction
- Collision theory
- reactant particles must collide with each other
- Particles must have enough energy for them to react
- Activation energy = minimal amount of energy needed
- Collision theory
- Measuring rates of reaction
- Depends on reactants and products involved
- How easy it is to measure changes
- Measuring mass
- Is followed during a reaction
- Not suitable for elements with a small relative formula mass
- Measuring volume
- Change in volume can be followed during a reaction
- Useful when the gas leaves the container
- Rate of reaction
- Rates, concentration and pressure
- If the concentration of a reacting solution or the pressure of a reacting gas is increased...
- Reactant particles become more crowded
- Frequency of collisions increases
- Rate of reaction increases
- If the concentration of a reacting solution or the pressure of a reacting gas is increased...
- Rates and temperature
- If the temperature of the reaction increases...
- Reactant particles move quicker
- Energy of particles increases
- Frequency of successful collisions increases
- Proportion of successful collisions increases
- Rate of reaction increases
- If the temperature of the reaction increases...
- Catalists
- Increases rate of reaction but does not change the product
- Only a small amount of catalyst is needed
- Enzyme
- Biological catalist
- Important for controlling reactions
- Controlling chemical reactions
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