Term
| Name the four factors which affect the rate of a reaction |
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Definition
temperature
surface area
concentration
presence of a catalyst |
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Term
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Definition
1. cooking with heat speeds up breaking down of food
2. freezing food stops decomposition
3. refrigerating food slows down decomposition
4. prehistoric animals found preserved in the ice
5. increasing temperature when graphite turns to diamonds shortens the time |
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Term
| Examples of concentration |
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Definition
1. more dish soap in water
2. diluting a solution, more water when mixing frozen orange juice
3. blowing on a fire and flames shoot up
4. in a crowded hallway, more chance of bumping into someone |
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Term
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Definition
1. chopping vegetables for soup
2. crushing garlic to release fragrence
3. breaking a reactant into smaller pieces
4. sugar grains vs sugar cubes
5. twigs vs logs of wood
6. whole grains and solid coal burn slowly while grain and coal dust explode |
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Term
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Definition
1. catalytic convverter in exhaust system of vehicles
2. digestive enzymes in your stomach |
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Term
| How does increasing temperature affect the rate of a reaction? |
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Definition
| The reactant particles move more quickly, they collide more frequently with more energy, the higher the rate of reaction. |
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Term
| How does decreasing temperature affect the rate of a reaction? |
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Definition
| The reactant particles move more slowly, they collide less frequently with less energy, the lower the rate of reaction. |
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Term
| How does increasing concentration affect the rate of a reaction? |
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Definition
| There is a greater chance that collisions will occur, a higher reaction rate. |
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Term
| How does decreasing concentration affect the rate of a reaction? |
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Definition
| There is less chance that collisions will occur, a lower reaction rate. |
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Term
| How does increasing surface area affect the rate of a reaction? |
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Definition
| It increases the surface contact between reactants, increasing the rate of reaction. |
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Term
| How does decreasing surface area affect the rate of a reaction? |
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Definition
| It decreases the surface contact between reactants, decreasing the rate of reaction. |
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Term
| How does adding a catalyst affect the rate of a reaction? |
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Definition
| Less energy is needed to break and form bonds during a reaction. It speeds up the rate of reaction. |
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Term
| How does removing a catalyst affect the rate of a reaction? |
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Definition
| More energy is needed to break and form bonds during a reaction. It slows down the rate of the reaction. |
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Term
| When is surface area not a factor during a reaction? |
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Definition
| If both reactants are gases or liquids that mix together. |
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Term
| How do you increase surface area? |
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Definition
| Cut the reactants into smaller pieces. |
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Term
| How do you increase concentration? |
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Definition
| Add more solute, or less solvent to a solution. |
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Term
| How do you decrease concentration? |
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Definition
| Add less solute, or more solvent to a solution. |
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