What sort of solutions are sodium thiosulfate and hydrochloric acid and what do them form?
They are clear solutions, which together form a yellow precipitate of sulfur.
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What does the experiment involve?
Watching a black mark disappear through the cloudy sulfur and timing how long it takes to go.
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What can be done for the reaction?
It can be repeated for solutions at different temperatures. A water bath is used to heat both solutions to the right temperature before you mix them.
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What must be kept the same each time?
The depth of liquid.
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What will the results show?
That the higher the temperature, the quicker the reaction and therefore the less time it takes for the mark to disapper.
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What is a catalyst?
A catalyst is a substance which changes the speed of a reaction, without being used up in the reaction.
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How does a catalyst work?
A catalyst works by lowering the energy required by the reactants to react.
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What does it make easier for the reaction?
This makes it easier for the reaction to happen and increases the rate of reaction.
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What does it mean?
This means that a lower temperature can be used, without the rate of reaction dropping.
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What is an example of a use of catalysts? Where are they found?
Catalytic converters, which are found in motor vehicles.
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What can vehicle exhausts give off?
Poisonous gases like carbon monoxide if petrol doesn't burn properly.
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Where is a catalytic converter used?
In the exhaust pipe. It increases the rate at which carbon monoxide and unburnt fuel in exhaust gases react with oxygen in the air to produce carbon dioxide and water.
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What does the catalyst have? What does it work best at?
A large surface area and works best at high temperatures to increase the rate of reaction.
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Other cards in this set
Card 2
Front
What does the experiment involve?
Back
Watching a black mark disappear through the cloudy sulfur and timing how long it takes to go.
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