GCSE Chemistry- C8
- Created by: meganstodd
- Created on: 16-10-18 16:37
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- C8-Rates and Equilibrium
- Rate of Reaction
- measures speed of reaction eg: explosion= fast RoR, rusting of iron= slow RoR
- mean RoR= quantity of reactant/time taken OR quantity of product/time taken
- The RoR can be found on a graph by the gradient the line.
- Collision Theory
- Particles can only react if they collide.
- The minimum energy they can have is ACTIVATION ENERGY.
- Surface Area
- RoR increases if surface area to volume ratio of solid reactants is increased
- Increases frequency of collisions
- RoR increases if surface area to volume ratio of solid reactants is increased
- KEY WORDS- Gradient, Collision theory, activation energy, catalyst, hydrated, anhydrous, closed system, equilibrium, La Chateliers Principal
- Effect of Temperature
- Reaction speed increases
- More particles have more than required activation energy
- Product produced more quickly
- Concentration & Pressure
- Increasing concentration increases frequency of collisions & RoR
- Increasing pressure of gasses increases RoR
- Catalysts
- Speeds up the rate of a chemical reaction but remains chemically unchanged.
- Different catalysts are needed for different reactions
- They help reduce energy costs
- Reversible Reactions
- The products of the reaction can ret to make the original reaction
- The reversible reaction is represented using an arrow sign.
- Dynamic Equilibrium
- In a closed system the rate of both reactions are the same.
- Changing the reaction conditions alters the amount of product produced and the time it takes
- Rate of Reaction
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