- Created by: abbiedye
- Created on: 25-07-18 14:59
What reactions go at different rates?
- The rate = how fast the reactants are changed into particles
- An example of a slow reaction is the rusting or iron and chemical weathering
- An example of a moderate speed reaction is the reaction of magnesium and acid
- An example of a fast reaction is burning and explosions
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Why do particles collide in order to react?
- The more collisions, the faster the reaction
- The particles must collide with enough energy for the collision to be successful
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How does temperature effect rate of reaction?
- As temperature increases, particles move faster
- They collide more frequently
- They have more energy
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How do concentration and pressure effect reaction?
- More particles in the same volume
- Pressure = same particles in a smaller space
- Collisions are more frequent
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How does surface area effect reaction?
- Breaking it into smaller pieces will increase its surface area
- Same volume = more area to work and therefore more collisions
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How does a catalyst effect reaction?
- It decreases the activation energy
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What are reversible reactions?
- Reactions that can pass both ways through the equilibrium
- As the forward and backward reaction is at the same rate, the system is at equilibrium - 'closed system
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Where can the position of equilibrium be?
- To the right = products greater than reactants
- To the left = reactants greater than products
- These depend on: temperature, pressure, and concentration
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What is Le Chatelier's Principle?
- The idea that if you change the conditions of a reversible reaction at equilibrium, the system will try to counteract that change
- It can be used to predict the changes in a system
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How do reversible reactions counteract changes?
- When the reaction increases, the equilibrium will act in the opposite way to try and decrease it
- When the reaction decreases, the equilibrium will act in the opposite way to try and increase it
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