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Chemistry- Rates of reaction

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kushagramodi56's version from 2015-04-17 10:50

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Question Answer
Equation for rate of reactionAmount of reactants used or the products formed over time
3 methods of measuring rate of reaction1.Measuring mass loss from a mixture. 2. Measuring volume of gas produced. 3. Measuring light transmitted through a solution
What is the collision theoryParticles have to collide with enough energy to be able to react
What is activation energy meanIt is the minimum amount of energy needed for particles to collide
When are reactions most likely to occurWhen we increase the frequency of collisions and when we increase the amount of energy in collisions
What is rate of reaction affected byConcentration, pressure, temperature, surface area and catalysts.
What is the effect of concentration and pressure on the rate of reactionAs the concentration increases, the rate of reaction increases as there is a greater amount of particles in a certain volume meaning there will be a greater collision frequency. This is the exact same concept as with pressure.
What is the effect of surface area on the rate of reactionThe smaller the size of the solid, the greater the surface area. As the surface area increases, the rate of reaction increases as ,ore particles are exposed in a given time period meaning there is a greater collision frequency.
What is the effect of temperature on the rate of reactionAs the temp. increases. the rate of reaction increases as particles will have a lot of energy meaning they move around vastly meaning there is a greater collision frequency. More particles will have the required activation energy meaning there are more successful reactions.
What is the effect of catalyst on the rate of reactionIt is a substance that increases the rate of reaction without being chemically changed or used up itself. It provides an alternative pathway for reaction that has a lower activation energy. More particles will have the required activation energy for successful collisions. This reduces the cost of production.
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