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A student investigated the rate of reaction between dilute hydrochloric acid and marble chips (calcium carbonate) - Edexcel - GCSE Chemistry - Question 8 - 2016 - Paper 1
Question 8
A student investigated the rate of reaction between dilute hydrochloric acid and marble chips (calcium carbonate). Calcium chloride, carbon dioxide and water are fo... show full transcript
Worked Solution & Example Answer:A student investigated the rate of reaction between dilute hydrochloric acid and marble chips (calcium carbonate) - Edexcel - GCSE Chemistry - Question 8 - 2016 - Paper 1
Step 1
Complete and balance the equation for the reaction.
Answer
The reaction between calcium carbonate (CaCO₃) and hydrochloric acid (HCl) can be represented by the following unbalanced equation:
Balancing this equation involves ensuring that the number of each type of atom is equal on both sides. The balanced equation is:
Step 2
State how the graph shows that line B gives the results for the larger marble chips.
Answer
Line B on the graph indicates that the volume of gas produced increases at a different rate compared to line A. Specifically, the slope of line B is steeper, suggesting that larger marble chips yield a greater volume of gas generated over the same time period. This implies that the rate of reaction is higher for the larger marble chips due to a greater surface area available for reaction with the hydrochloric acid.
Step 3
A tangent has been drawn on line A.
Answer
The tangent drawn on line A represents the rate of reaction at a specific point in time. The slope of this tangent indicates how quickly the gas is being produced at that moment. By measuring the slope of the tangent, one can derive the reaction rate at that particular instance, which is essential for analyzing the overall change in reaction rate over time.