1 (a) 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
1 (a) 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 hydroc... show full transcript
Worked Solution & Example Answer:1 (a) 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 of hydrogen gas being released. The solution may also become cloudy as it reacts.
Step 2
Write the word equation for this reaction.
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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 acid before and after adding the zinc. If the temperature increases, it 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 increase the reaction rate, you can decrease the size of the pieces of zinc to increase the surface area exposed to the acid.
Step 5
State the effect of adding a catalyst on the rate of a reaction.
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Answer
Adding a catalyst increases the rate of the reaction.
