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Rates of Reaction
atoms or ions (electrically charged particles) combine occur very rapidly, while those in which covalent bonds (bonds in which atoms share electrons ) are broken are much slower. By chewing your food you increase the surface area so that digestion can go faster. When the petrol air mixture has been compressed, a spark from the plug ignites the mixture. If one of the reactants is a solid, the surface area of the solid will affect how fast the reaction goes. Usually reactions speed up with increasing temperature 100C rise doubles rate. Adding extra catalyst will make absolutely no difference. It is not enough in a petrol engine to produce combustion, so petrol engines need a spark plug. You should already know that the atoms or molecules in a gas are very spread out. You should have come across the idea in your biology lessons. So the larger the surface area of the solid, the faster the reaction will. This is because once the reaction has started, heat is produced and this will make it go even faster.
Reaction rate - Wikipedia
Rates of Reaction
In some cases the addition of a substance that is not itself a reactant, called a catalyst, accelerates a reaction. This is collision theory again. This is collision theory. This is "Bread and Butter Theory". In a diesel engine, compressing the gaseous mixture of air and diesel also increases the temperature enough to produce combustion. The rate of a reaction can be measured by the rate at which a reactant reactant : Substances present at the start of a chemical reaction is used up, or the rate at which a product product : A product is a substance formed. How do catalysts affect the rate of a reaction?
What factors affect the rate of a reaction? On the surface of the solid. A catalyst speeds up a reaction, an inhibitor slows it down.