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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 in aqueous solution, denoted as magnesium chloride(aq), means that it is dissolved in water. In contrast, magnesium chloride in liquid state, denoted as magnesium chloride(l), means that it is in its liquid form, not necessarily dissolved in water. Therefore, the key difference lies in the solvent: (aq) indicates being in solution with water, while (l) indicates a pure liquid state.
Step 2
Describe what you would see when magnesium ribbon reacts with dilute hydrochloric acid.
Answer
When magnesium ribbon reacts with dilute hydrochloric acid, you would observe effervescence, which is the release of bubbles. This is due to the production of hydrogen gas during the reaction. The magnesium ribbon may also dissolve or diminish in size as it reacts.
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
In the graph, we would draw a curve that starts at the origin (0,0) and rises steeply initially, then begins to level off as it approaches the total volume, indicating that the rate of hydrogen production slows down as the magnesium is consumed.
Step 6
Explain the effect on the rate of reaction of using magnesium powder instead of magnesium ribbon.
Answer
Using magnesium powder instead of magnesium ribbon will increase the rate of reaction. This is because the powder has a larger surface area compared to the ribbon, allowing more collisions with the acid particles, resulting in a faster reaction rate.
Step 7