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How can we speed up or slow down a reaction?


Kelsey Bohn

on 2 February 2011

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Transcript of How can we speed up or slow down a reaction?

How can we speed up or slow down a reaction? A reaction rate is a measure of how fast a reaction occurs. The rate of a chemical reaction can be speeded up or slowed down by changing the temperature. At higher temperatures the rate of most chemical reactions increases. Faster-moving molecules and atoms collide more frequently and therefore can form new substances more quickly. For example, the high temperature inside an oven speeds up the chemical reations that change liquid batter into a cake. Other ways of changing the rate of the Chemical Reactions are, by stirring them and/or changing the size or concentration of the reactants. eg.
Stirring a cake batter will speed
up the reaction rate. If you increase the concentration of a substance, you will increase the number of particles of a substance per unit volume. Another way to change the rate of a reaction is to add or remove a substance called a catalyst. Catalyst- is a substance that speeds up the rate of a reaction without being changed itself. An enzyme is a natural catalyst made by living things. an example of a enzyme is saliva. The enzyme in saliva acts as a catalyst to help break down starches into smaller molecules You can also slow down chemical reactions with inhibitiors. Inhibitors are substances that slow down chemical reactions. For example some plants have natural inhibitors in their seeds to prevent germination until conditions are just right. Inhibitors are added to some foods and medicines to slow down their decompostion. reactants-The substances that go into a chemical reaction.
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