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 11 - Edexcel - GCSE Chemistry - Question 6 - 2019 - Paper 1
Question 6
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 11 - Edexcel - GCSE Chemistry - Question 6 - 2019 - Paper 1
Step 1
Name the apparatus that could be used to measure out 100 cm³ of dilute hydrochloric acid.
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Answer
Any suitable container for measuring volume of 100 cm³, such as a measuring cylinder or a pipette, could be used.
Step 2
Explain why there is a loss in mass of the flask and contents.
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Answer
As magnesium reacts with dilute hydrochloric acid, hydrogen gas is produced. This hydrogen escapes from the flask, resulting in a loss of mass.
Step 3
Explain, in terms of particles, why the rate of reaction between magnesium ribbon and dilute hydrochloric acid slows as the reaction takes place.
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Answer
Initially, there are many magnesium particles available to react with the acid. However, as the reaction progresses, fewer magnesium particles remain. Consequently, the number of effective collisions between magnesium and hydrogen ions decreases, leading to a slower reaction rate.
Step 4
State the effect of the higher temperature on the mass loss after two minutes.
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The mass loss will be greater at a higher temperature due to an increase in the rate of reaction.
Step 5
Sketch, on the graph in Figure 12, the line you would expect for this experiment.
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Answer
When using magnesium powder, the rate of reaction will be faster compared to the ribbon, resulting in a steeper initial slope. The line should start off steeper and then level off, indicating faster mass loss initially.
Step 6
State the effect of a catalyst on a reaction.
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Answer
A catalyst speeds up a chemical reaction without being consumed in the process.
Step 7
Devise a simple experiment to find out what happens to the mass of a solid catalyst during a reaction.
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We can conduct a reaction using a solid catalyst in a closed system. Measure the mass of the catalyst before and after the reaction. The mass should remain unchanged, indicating that the catalyst participates in the reaction but is not consumed.
