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The apparatus shown was used by a student to investigate the reaction between strips of magnesium ribbon and excess dilute hydrochloric acid - Edexcel - GCSE Chemistry - Question 4 - 2015 - Paper 1
Question 4
The apparatus shown was used by a student to investigate the reaction between strips of magnesium ribbon and excess dilute hydrochloric acid. The word equation for ... show full transcript
Worked Solution & Example Answer:The apparatus shown was used by a student to investigate the reaction between strips of magnesium ribbon and excess dilute hydrochloric acid - Edexcel - GCSE Chemistry - Question 4 - 2015 - Paper 1
Step 1
Explain the difference between magnesium chloride(aq) and magnesium chloride(l).
Answer
Magnesium chloride (aq) means magnesium chloride is dissolved in water, making it an aqueous solution. In contrast, magnesium chloride (l) means it is in liquid form, indicating a pure liquid state without being dissolved in water.
Step 2
Step 3
Step 4
Step 5
On the graph draw a curve to show how the volume of hydrogen changes with time during this experiment.
Answer
The graph should depict a curve that shows a rapid increase in volume initially, which then plateaus as the reaction nears completion, reflecting the slowing rate of hydrogen production.
Step 6
Explain the effect on the rate of reaction of using magnesium powder instead of magnesium ribbon.
Answer
Using magnesium powder instead of ribbon increases the rate of reaction because the powder has a larger surface area, allowing more collisions between magnesium and hydrochloric acid molecules, thus speeding up the reaction.
Step 7
Explain what conclusion can be made about the type of reaction from these results.
Answer
The significant temperature increase from 21°C to 62°C indicates an exothermic reaction, meaning that energy is released into the surroundings as the reaction occurs, confirming that it is an exothermic process.