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 of hydrogen gas being produced. The reaction may also cause effervescence as zinc reacts with the acid.
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 whether this reaction is exothermic, one could measure the temperature of the solution before and after adding zinc. If the temperature increases after the zinc is added, it indicates that the reaction releases heat, thus confirming it is exothermic.
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 rate of reaction, one can decrease the size of the zinc pieces by using a powder or increasing the surface area. This allows for more surface contact between the zinc and hydrochloric acid.
Step 5
State the effect of adding a catalyst on the rate of a reaction.
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Adding a catalyst increases or speeds up the rate of a reaction without being consumed in the process.
