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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
In chemical notation, (aq) stands for an aqueous solution, which means that magnesium chloride is dissolved in water, allowing it to dissociate into its ions. In contrast, (l) indicates a liquid state, which refers to magnesium chloride being in its pure liquid form, not necessarily dissolved in water.
Step 2
Describe what you would see when magnesium ribbon reacts with dilute hydrochloric acid.
Answer
You would observe effervescence, which includes bubbles forming as hydrogen gas is released. The magnesium ribbon would also gradually disappear as it reacts with the hydrochloric acid, causing a temperature increase in the solution.
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 display a curve that rises steeply at first (indicating a rapid increase in hydrogen production), then gradually levels off as the reaction slows down, showing the volume of hydrogen produced over time.
Step 6
Explain the effect on the rate of reaction of using magnesium powder instead of magnesium ribbon.
Answer
Using magnesium powder increases the rate of reaction compared to ribbon because the powder has a larger surface area exposed to the acid, allowing more frequent collisions between the magnesium and hydrochloric acid particles, which speeds up the reaction.
Step 7