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The word equation for the reaction between magnesium and dilute hydrochloric acid is magnesium + hydrochloric acid → magnesium chloride + hydrogen The reaction was carried out using the apparatus shown in Figure 6 - Edexcel - GCSE Chemistry Combined Science - Question 4 - 2019 - Paper 1
Question 4
The word equation for the reaction between magnesium and dilute hydrochloric acid is magnesium + hydrochloric acid → magnesium chloride + hydrogen The reaction was... show full transcript
Worked Solution & Example Answer:The word equation for the reaction between magnesium and dilute hydrochloric acid is magnesium + hydrochloric acid → magnesium chloride + hydrogen The reaction was carried out using the apparatus shown in Figure 6 - Edexcel - GCSE Chemistry Combined Science - Question 4 - 2019 - Paper 1
Step 1
4(b) Explain what happens in terms of particles during the reaction.
Answer
When magnesium reacts with dilute hydrochloric acid, hydrogen gas is produced as indicated in the word equation. As magnesium particles collide with the particles of hydrochloric acid, they react to form magnesium chloride and release hydrogen gas into the environment.
Step 2
4(c) Explain why the graph increases and then levels off.
Answer
The graph initially increases because the reaction between magnesium and hydrochloric acid is proceeding, leading to a loss in mass as hydrogen gas is produced. As the reaction continues, fewer magnesium particles are available for reaction. Eventually, the graph levels off when most of the magnesium has reacted, indicating that the rate of mass loss decreases significantly.
Step 3
4(e) Draw a sketch of the graph.
Answer
The graph should show a curve that rises steeply at first and then flattens out, indicating the loss of mass over time. The line should have a steeper gradient to the left and level off to the right, starting at zero mass loss and approaching a horizontal line as time increases.