Y11 Chem L7 Rates of reaction

Which change will not increase the rate of reaction between CaCO₃ (s) and HCl (aq)?

• Smaller pieces of CaCO₃

• Higher temperature of HCl

• Higher concentration of HCl

• Larger volume of HCl

The catalytic decomposition of 100 cm³ of hydrogen peroxide is carried out with 1g of potassium iodide. Which change would increase the final volume of O₂ given off?

• Higher temperature of hydrogen peroxide

• Larger mass of potassium iodide

• Higher concentration of hydrogen peroxide

• Changing potassium iodide for manganese dioxide

In the reaction between magnesium and sulfuric acid, which of the following combinations would give the purple rate of reaction?

• 25 cm³ H₂SO₄ 0.2 mol/dm³
  Temperature = 25 C

  Excess magnesium

• 50 cm³ H₂SO₄ 0.2 mol/dm³
  Temperature = 25 C

  Excess magnesium

• 50 cm³ H₂SO₄ 0.1 mol/dm³
  Temperature = 25 C

  Excess magnesium

• 50 cm³ H₂SO₄ 0.1 mol/dm³
  Temperature = 50 C

  Excess magnesium

Which graph shows how the rate of reaction changes with temperature?

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What changes would increase the yield of the forward reaction in the following reversible reaction?

• Increase temperature, reduce pressure

• Increase temperature, increase pressure

• Reduce temperature, increase pressure

• Reduce temperature, reduce pressure