Rate experiments

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  • Created by: SumedhaR
  • Created on: 21-09-20 10:10
1. How to measure the rate if a precipitation reaction?
2 see-through solutions react to form an insoluble solid which makes the solution cloudy. Mix reactants in a flask on top of a piece of paper with a mark on it. Faster the mark disappears, faster the rate. This is subjective ie. different each time
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2. What is the condition for that method?
Both of the reactants must be soluble and see-through.
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3. What two methods can be used to find rate when the product is a gas?
Experiment that measures change in mass or the volume of gas given off.
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4. Describe the change in mass method.
when product is a gas. as gas escapes, mass is lost Use cotton wool to close the flask.. reaction stops when mass stops changing. Plot a graph of change in mass over time.
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5. Why is cotton wool used?
To stop solid, liquid or aqueous reactants from escaping.
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6. What are the safety precautions?
If gas released is harmful use a fume cupboard.
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Volume experiment.
Measure volume of gas product using syringe, measure time, more gas given off in a time interval, the faster the rate. When gas produced stops increasing, the reaction is over. Use appropriate sized syringe or else the plunger will blow out..
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Surface area experiment for CaCO3 and HCl.
Take readings at regular time intervals. Constants are volume and concentration of acid, same mass of chips. Independent variable is surface area make chips finer for second experiment.
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Describe surface area graphs for large chips, small chips, fine chalk and twice the mass of fine chalk.
Large chips will have the lowest gradient, small chips will have a higher gradient and fine chalk will have the steepest gradient and all three will produce the same volume of gas. twice the mass of fine chalk will have double the gradient.
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Other cards in this set

Card 2

Front

2. What is the condition for that method?

Back

Both of the reactants must be soluble and see-through.

Card 3

Front

3. What two methods can be used to find rate when the product is a gas?

Back

Preview of the front of card 3

Card 4

Front

4. Describe the change in mass method.

Back

Preview of the front of card 4

Card 5

Front

5. Why is cotton wool used?

Back

Preview of the front of card 5
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