Rates of Reaction – Concentration

1. Rates of Reaction –Concentration

2. Write down what these words mean in your books • Particles • Collision • Concentration • Rate

3. Their meanings: • Particles – make up all substances. They can be atoms, molecules or ions. • Collision – occurs when things crash together. • Concentration – if a substance is more concentrated, there are more particles present that make up the substance. • Rate – is a measure of how quickly something happens, or the speed at which the reaction occurs.

4. Now that you know the meanings of the words - write some sentences to link them together. Do you know any examples of fast and slow reactions?

5. Rate of reaction • The rate of reaction depends on how often and how hard the reacting particles collide with each other. • Particles have to collide with each other, in order to react, and they have to collide hard enough as well. More collisions increase the rate of reaction

6. Concentration • If a solution is not very concentrated, then it is said to be dilute. For example, washing powder dissolved in water. • The concentration can be changed by increasing the amount of the powder. • Will stains easily be removed if the powder is concentrated or if there is less of it?

7. Which is more concentrated? Draw these in your books and write down the concentration for each one. (High or low)

8. Measuring the rate of a reaction • How can we measure the rate of a reaction? • What change or changes are taking place in a reaction? • The reactants are reacting and new products are formed. • Therefore by measuring the rate at which a reactant is used up or a product is formed, we can measure the rate of a reaction.

9. Effect of concentration on a reaction rate • How will concentration affect the rate of a reaction? You will soon find out!