Rates of reaction
- Created by: Noshinxoxo
- Created on: 19-01-14 14:58
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- RATES OF REACTION
- RATE = how FAST a reaction goes (speed)
- to measure the change over a period of time
- Graph
- The curve is steepest at the start so the reaction is fastest then (its rate is greatest
- The slope keeps changing until the curve flattens out which tells us that the rate of the reaction keeps changing
- The curve becomes less steep as time passes, showing that the reaction is slowing down
- The slope of the curve tells you how fast the reaction is going
- When the curve goes flat, it means that the reaction has stopped. The reaction rate is zero
- Average rate of reaction (in cm per min or sec) = total volume of gas collected (in cm ) divided by total time taken (in min or sec)
- Ways to change the rate of reaction
- by changing the particle size
- using a catalyst
- for example using manganese oxide
- Catalysts in industry
- When making ammonia, iron (a catalyst) is used.
- Reduces fuel bills
- by changing the temperature
- If you increase any of these the rate will increase, and if you decrease them then the rate will decrease
- by changing the concentration
- by changing the particle size
- If you increase any of these the rate will increase, and if you decrease them then the rate will decrease
- by changing the concentration
- RATE = how FAST a reaction goes (speed)
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