Chemistry - Rate of Reaction 0.0 / 5 ? ChemistryReactionsNational 5SQA Created by: KalitiseCreated on: 07-06-18 17:48 What is a catalyst? A catalyst is a substance which when added to a reaction, speeds up the reaction without being used up? 1 of 12 What is the average rate formula? Average Rate = ^quantity/^time (^=change) 2 of 12 What happens when you increase the temperature in a reaction. Why does this happen? The reaction will speed up. This happens because the rise in temperature increases the kinetic energy of the particles which causes more collisions. 3 of 12 What four things can be done to increase the rate of reaction? 1. Decrease the particle size 2. Increase the concentration 3. Increase the temperature 4. Add a catalyst 4 of 12 When would increasing the rate of reaction be useful? In industry where it is often required to make as much product as possible in as little time as possible. 5 of 12 Can a catalyst be used more than once? Yes - they do not get used up during a reaction. 6 of 12 What does using a catalyst allow you to do? Using a catalyst allows you to carry out the reaction at a lower temperature saving energy. 7 of 12 Why does the metal on the bottom of a pot often rust when used on a gas cooker? Because the heat speeds up the process of corrosion. 8 of 12 why does decreasing the particles size speed up a reaction? Because it increases the surface area allowing the particles to collide more quickly. 9 of 12 Why does increasing the concentration speed up a reaction? Because there are more particles in a more concentrated solution to collide. 10 of 12 Why does increasing the temperature speed up a reaction? Because it increases the kinetic energy of the particles causing more collisions 11 of 12 Why does using a catalyst speed up a reaction? Catalysts change how a reaction happens. 12 of 12
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