Pieces of zinc react with dilute hydrochloric acid to produce zinc chloride and hydrogen gas - Edexcel - GCSE Chemistry - Question 1 - 2017 - Paper 1
Question 1
Pieces of zinc react with dilute hydrochloric acid to produce zinc chloride and hydrogen gas.
(i) State what you would see when zinc is added to dilute hydrochloric... show full transcript
Worked Solution & Example Answer:Pieces of zinc react with dilute hydrochloric acid to produce zinc chloride and hydrogen gas - Edexcel - GCSE Chemistry - Question 1 - 2017 - Paper 1
Step 1
State what you would see when zinc is added to dilute hydrochloric acid.
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Answer
When zinc is added to dilute hydrochloric acid, you would observe bubbles forming due to the release of hydrogen gas. The solution may also become cloudy as zinc dissolves.
Step 2
Write the word equation for this reaction.
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Answer
The word equation for the reaction is: zinc + hydrochloric acid → zinc chloride + hydrogen.
Step 3
Describe a test to show that this reaction is exothermic.
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Answer
To test if the reaction is exothermic, measure the temperature of the solution before and after the reaction using a thermometer. If the temperature increases, this indicates that the reaction releases heat.
Step 4
State what can be done to the pieces of zinc to make the reaction with the dilute hydrochloric acid faster.
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To speed up the reaction, you can decrease the size of the pieces of zinc, which increases the surface area available for reaction.
Step 5
State the effect of adding a catalyst on the rate of a reaction.
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The effect of adding a catalyst is that it increases the rate of the reaction without being consumed in the process.
