Rates of reaction questions

Assignment: Questions on Topic 6.1 : Rates of reaction

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Define the term rate of reaction.

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Explain why the rate of a chemical reaction generally decreases as the reaction proceeds.

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The graph below shows the volume of hydrogen evolved against time for the reaction of a piece of solid magnesium metal with 1.00 mol dm-3 hydrochloric acid, HCl(aq).

Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)

i. Deduce the rate of the reaction at time t = 1.5 minutes.

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ii. Assuming magnesium is the limiting reagent and the gas was collected at STP, calculate the mass of the piece of magnesium metal used.

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iii. Describe how the graph would have looked if the magnesium metal had been in powdered form.

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The graph below shows how the concentration of a reactant changes during the course of a chemical reaction.

Deduce the initial rate of this reaction.

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