Question 1
Which statement correctly explains how a catalyst increases the rate of a chemical reaction?
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Chemistry · Unit 2 · Rates of chemical reactions · Rates of reactions
Explain how catalysts affect the rate of a chemical reaction.
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Question 2
A student investigates the decomposition of hydrogen peroxide (H₂O₂) by measuring the volume of oxygen gas produced over time. In trial 1, 50 mL of 0.10 mol L⁻¹ hydrogen peroxide decomposes at 25°C without a catalyst. In trial 2, the student repeats the experiment using the same volume and concentration of hydrogen peroxide at 25°C, but adds 0.5 g of manganese(IV) oxide catalyst. Explain how the addition of manganese(IV) oxide increases the rate of decomposition in trial 2 compared to trial 1.
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