The reactivity of copper, magnesium and zinc was investigated - Edexcel - GCSE Chemistry - Question 5 - 2019 - Paper 1
Question 5
The reactivity of copper, magnesium and zinc was investigated.
Each metal was placed separately in dilute hydrochloric acid.
The amount of effervescence was observed... show full transcript
Worked Solution & Example Answer:The reactivity of copper, magnesium and zinc was investigated - Edexcel - GCSE Chemistry - Question 5 - 2019 - Paper 1
Step 1
Which piece of apparatus should be used to find the mass of metal used?
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Answer
The correct piece of apparatus to find the mass of metal used is A a balance. This is because a balance accurately measures the mass of objects.
Step 2
State two variables, apart from the mass of the metals, that should be controlled in this investigation.
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Answer
Two variables that should be controlled include:
The concentration of the hydrochloric acid used, as it affects the rate of reaction.
The temperature of the reaction, since it can influence the reaction rate.
Step 3
Give the reason why copper does not produce any effervescence.
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Answer
Copper does not produce any effervescence because it is less reactive than hydrogen, meaning it does not displace hydrogen ions from the acid.
Step 4
Fill in the missing state symbols in the spaces provided.
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Answer
The balanced equation with the correct state symbols is:
Mg(s) + 2HCl(aq) → MgCl₂(aq) + H₂(g)
Step 5
Write the formula of potassium sulfate.
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Answer
The formula of potassium sulfate is K₂SO₄.
Step 6
Calculate the mean mass of potassium sulfate obtained, giving your answer to two decimal places.
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Answer
To find the mean mass of potassium sulfate:
Mean mass = (5.22 + 5.24 + 5.21) / 3 = 5.222 g
Rounded to two decimal places, the mean mass is 5.22 g.
