9 (a) Which metal reacts when added to cold water?
A calcium
B copper
C gold
D silver
(b) A student investigates the reactivity of four different metals - Edexcel - GCSE Chemistry - Question 9 - 2023 - Paper 1
Question 9
9 (a) Which metal reacts when added to cold water?
A calcium
B copper
C gold
D silver
(b) A student investigates the reactivity of four different metals.
... show full transcript
Worked Solution & Example Answer:9 (a) Which metal reacts when added to cold water?
A calcium
B copper
C gold
D silver
(b) A student investigates the reactivity of four different metals - Edexcel - GCSE Chemistry - Question 9 - 2023 - Paper 1
Step 1
Which metal reacts when added to cold water?
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Answer
The metal that reacts with cold water is A) calcium. This is due to its high reactivity, as indicated in the reactivity series.
Step 2
A student investigates the reactivity of four different metals.
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Answer
Observation for magnesium: The metal produces many bubbles quickly, indicating a vigorous reaction. The temperature of the test tube feels warm.
Observation for zinc: Bubbles are produced steadily and the test tube feels slightly warm. This suggests a slower reaction compared to magnesium.
Observation for iron: Generally, iron does not react well with dilute hydrochloric acid, resulting in little to no observable reaction.
Observation for copper: Copper shows no reaction with the acid, confirming its low reactivity.
Step 3
Describe the method for identifying hydrogen gas produced.
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Answer
To identify if hydrogen gas is produced in a reaction with metals, apply a lit splint to the gas. If hydrogen is present, it will produce a characteristic 'pop' sound.
Step 4
Chemical equation for reaction of magnesium with hydrochloric acid.
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Answer
The balanced chemical equation for the reaction between magnesium and hydrochloric acid is:
