chemistry year 10-11 -> topic 6 rate and extent of chemical change

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8 Terms

1
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factors affecting the rate of a reaction

collision theory

for particles to react they must collide with enough energy.

activation energy = the minimum energy required

the more frequent the successful collisions are, the faster the rate of the reaction

2
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what are the factors affecting the rate of a reaction (5)

  1. increased temperature

  2. increased surface area of solids

  3. increased concentration of solutions

  4. increased gas pressure

  5. using a catalyst

3
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factors affecting the rate of a reaction

increased temp

as temp inc, reaction rate inc becayse the particles have more energy and move quicker and so particles collide more frequently

more of the collisions are successful because more of the particles have activation energy

<p>as temp inc, reaction rate inc becayse the particles have <strong>more </strong>energy and move <strong>quicker </strong>and so particles <strong>collide more frequently</strong></p><p class="has-focus">more of the collisions are successful because more of the particles have <strong>activation energy</strong></p>
4
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factors affecting the rate of a reaction

inc surface area of solids

does energy change

as surface area inc, reaction rate increases because there are more particles available to react and therefore an increase in the frequency of collisions between the reacting partcles

(energy doesnt change)

<p>as surface area inc, reaction rate <strong>increases </strong>because there are <strong>more particles available to react </strong>and therefore an increase in the frequency of collisions between the reacting partcles</p><p class="has-focus">(energy doesnt change)</p>
5
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factors affecting the rate of a reaction

inc concentration of solutions

dpes energy change

as concentration increases reaction rate increases because there are more particles per unit volume and therefore an increase in the frequency of collisions between the reacting particles

(energy doesnt change)

<p>as concentration increases reaction rate increases because there are <strong>more particles per unit volume </strong>and therefore an <strong>increase in the frequency of collisions </strong>between the reacting particles</p><p class="has-focus">(energy doesnt change)</p>
6
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factors affecting the rate of a reaction

increased gas pressure

does energy change

increasing the pressure in a gas can be done by reducing the volume thsis squashes the particles together increasubg the pressure causing particles to collide more frequently, therefore inc rate of reaction

energy doesnt change

<p>increasing the pressure in a gas can be done by reducing the volume thsis <strong>squashes the particles together </strong>increasubg the pressure <strong>causing particles to collide <u>more </u>frequently, </strong>therefore inc rate of reaction</p><p class="has-focus">energy doesnt change</p>
7
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factors affecting the rate of a reaction

using a catalyst

catalsysts increase the rate of chemical reactions but are not run out during the reaction

different reactions need different catalysts

enzymes are catalysts in biological systems

catalysts increase the rate of reaction by providing a different pathway for the reaction that has a lower activation energy

8
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