A student carried out an experiment to see how reactive different metals are when they are placed in dilute hydrochloric acid - Edexcel - GCSE Chemistry Combined Science - Question 5 - 2016 - Paper 1
Question 5
A student carried out an experiment to see how reactive different metals are when they are placed in dilute hydrochloric acid.
A sample of each metal was placed in ... show full transcript
Worked Solution & Example Answer:A student carried out an experiment to see how reactive different metals are when they are placed in dilute hydrochloric acid - Edexcel - GCSE Chemistry Combined Science - Question 5 - 2016 - Paper 1
Step 1
Which gas is given off?
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Answer
When zinc reacts with dilute hydrochloric acid, hydrogen gas is produced. The reaction can be represented by the following equation:
extZn(s)+2HCl(aq)→ZnCl2ext(aq)+H2ext(g)
Thus, the correct answer is:
C hydrogen
Step 2
What is the formula of zinc chloride?
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Answer
The correct formula for zinc chloride is determined by combining zinc ions (Zn²⁺) and chloride ions (Cl⁻). Since zinc has a +2 charge and the chloride ion has a -1 charge, two chloride ions are needed to balance the charge of one zinc ion, resulting in:
