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This question is about the rate of reaction between calcium carbonate and dilute hydrochloric acid - Edexcel - GCSE Chemistry Combined Science - Question 4 - 2021 - Paper 1
Question 4
This question is about the rate of reaction between calcium carbonate and dilute hydrochloric acid. The word equation for this reaction is calcium carbonate + hydr... show full transcript
Worked Solution & Example Answer:This question is about the rate of reaction between calcium carbonate and dilute hydrochloric acid - Edexcel - GCSE Chemistry Combined Science - Question 4 - 2021 - Paper 1
Step 1
Step 2
Complete the diagram in Figure 5 to show the apparatus to collect the gas produced and measure its volume.
Answer
To complete the diagram, draw a delivery tube attached to the conical flask with a bung fitted to ensure an airtight seal. Connect the delivery tube to a gas syringe or have it leading into a water trough where an inverted measuring cylinder is placed to collect the volume of gas produced.
Step 3
Step 4
Draw a tangent at 100 seconds on Figure 6. Use this tangent to calculate the rate of reaction at this time.
Answer
To find the rate of reaction at 100 seconds, draw a tangent line to the curve at that point. Calculate the slope of the tangent, which represents the change in volume of gas collected over time; the rate can be calculated by taking the rise over the run (volume change/time change).
Step 5
Step 6
Explain, in terms of particles, how decreasing the temperature affects the rate of this reaction.
Answer
Decreasing the temperature reduces the kinetic energy of the particles involved in the reaction. As a result, the particles move more slowly, leading to fewer collisions between reactant particles per unit time. This decrease in collision frequency ultimately results in a lower rate of reaction, as the opportunity for successful collisions is diminished.