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8.1 Rates of reaction

8.1 Rates of reaction

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Question 12

A student investigates the rate of reaction between marble chips (CaCO3\text{CaCO}_3CaCO3​) and dilute hydrochloric acid (HCl\text{HCl}HCl) at 298 K:

CaCO3(s)+2HCl(aq)→CaCl2(aq)+H2O(l)+CO2(g) \text{CaCO}_3(\text{s}) + 2\text{HCl}(\text{aq}) \rightarrow \text{CaCl}_2(\text{aq}) + \text{H}_2\text{O}(\text{l}) + \text{CO}_2(\text{g}) CaCO3​(s)+2HCl(aq)→CaCl2​(aq)+H2​O(l)+CO2​(g)

In the baseline experiment, 5.0 g of medium-sized marble chips are reacted with 50 cm3 of 1.0 mol dm−3 HCl1.0\text{ mol dm}^{-3}\text{ HCl}1.0 mol dm−3 HCl.

Which of the following changes to this experiment will increase the initial rate of reaction?

A

Replacing the 50 cm350\text{ cm}^350 cm3 of 1.0 mol dm−3 HCl1.0\text{ mol dm}^{-3}\text{ HCl}1.0 mol dm−3 HCl with 100 cm3100\text{ cm}^3100 cm3 of 1.0 mol dm−3 HCl1.0\text{ mol dm}^{-3}\text{ HCl}1.0 mol dm−3 HCl

B

Replacing the 5.0 g5.0\text{ g}5.0 g of medium-sized marble chips with 5.0 g5.0\text{ g}5.0 g of larger marble chips

C

Replacing the 50 cm350\text{ cm}^350 cm3 of 1.0 mol dm−3 HCl1.0\text{ mol dm}^{-3}\text{ HCl}1.0 mol dm−3 HCl with 25 cm325\text{ cm}^325 cm3 of 2.0 mol dm−3 HCl2.0\text{ mol dm}^{-3}\text{ HCl}2.0 mol dm−3 HCl

D

Performing the reaction in a larger volume conical flask

Markscheme

8.1 Rates of reaction Questions

  1. GCSE
  2. /Chemistry
  3. /8.1 Rates of reaction

87 exam-style questions on Edexcel GCSE Chemistry 8.1 Rates of reaction, covering 8.1.1 Measuring and interpreting rates of reaction, 8.1.2 Collision theory and the factors affecting rate, and 8.1.3 Catalysts and enzymes. Each one has a worked solution and a mark scheme showing where the marks go.

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