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Establishing the factors, which affect the rate of a chemical reaction.
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SKILL AREA P: PLANNING EXPERIMENTAL PROCEDURES Scientific Background Reaction rates go at different speeds or rates, for example a very slow reaction is rusting, a moderate reaction would be magnesium and acid producing a gentle stream of bubbles and a fast reaction would be caesium and water. Reaction rates can be measured by the production of a product (e.g. a colour change) or the disappearance of a reactant (e.g. weight loss in a marble chip). A reaction rate can be changed in a number of ways: 1. Varying the concentration 2. Varying the temperature 3. Changing the surface area 4. Adding a catalyst Relationship between concentration and reaction rate If a solution becomes more concentrated it means there are more particles of the reactant knocking about between the water molecules, so collisions are more likely. Therefore if two reactant molecules collide, the reaction will take place. Increase in concentration increases the reaction rate. The concentration of a reactant in...
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