Which of the following would speed up the rate of reaction?Decreasing the temperatureUsing powder rather than lumps of reactantDecreasing the concentration of reactantRemoving a catalyst2Which of the following statements about catalysts is not true?They speed up chemical reactionsThey are chemically unchanged by a reactionThey lower the activation energy required for a reactionThey are chemically changed by a reaction3Why are catalysts useful for producing chemicals in industry?They are cheapThey increase the amount of productThey reduce the amount of reactant neededThey lower the amount of activation energy required4In the core practical ‘Investigating the effect of concentration on the rate of reaction between sodium thiosulfate and hydrochloric acid’, what is the dependent variable? Time taken for reaction to completeConcentration of hydrochloric acidTemperatureConcentration of sodium thiosulfate5In this practical, the first trial uses 5 cm3 of sodium thiosulfate solution dissolved in 25 cm3 of water. If the second trial uses 10 cm3 of sodium thiosulfate solution, how much water should be added to make the investigation a fair test? 10 cm350 cm320 cm325 cm36When investigating the rate of reaction, if one variable increases as the other decreases, what is the relationship between the two variables? UncorrelatedPositively correlatedDirectly proportionalInversely proportional
Question
Which of the following would speed up the rate of reaction?Decreasing the temperatureUsing powder rather than lumps of reactantDecreasing the concentration of reactantRemoving a catalyst2Which of the following statements about catalysts is not true?They speed up chemical reactionsThey are chemically unchanged by a reactionThey lower the activation energy required for a reactionThey are chemically changed by a reaction3Why are catalysts useful for producing chemicals in industry?They are cheapThey increase the amount of productThey reduce the amount of reactant neededThey lower the amount of activation energy required4In the core practical ‘Investigating the effect of concentration on the rate of reaction between sodium thiosulfate and hydrochloric acid’, what is the dependent variable? Time taken for reaction to completeConcentration of hydrochloric acidTemperatureConcentration of sodium thiosulfate5In this practical, the first trial uses 5 cm3 of sodium thiosulfate solution dissolved in 25 cm3 of water. If the second trial uses 10 cm3 of sodium thiosulfate solution, how much water should be added to make the investigation a fair test? 10 cm350 cm320 cm325 cm36When investigating the rate of reaction, if one variable increases as the other decreases, what is the relationship between the two variables? UncorrelatedPositively correlatedDirectly proportionalInversely proportional
Solution
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The rate of a reaction can be sped up by using a powder rather than lumps of reactant. This is because a powder has a larger surface area than lumps, which allows for more collisions between particles and therefore a faster reaction.
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The statement about catalysts that is not true is "They are chemically changed by a reaction". Catalysts are not consumed in a reaction and remain chemically unchanged.
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Catalysts are useful for producing chemicals in industry because they lower the amount of activation energy required. This means that reactions can occur at lower temperatures and pressures, saving energy and therefore reducing costs.
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In the core practical ‘Investigating the effect of concentration on the rate of reaction between sodium thiosulfate and hydrochloric acid’, the dependent variable is the time taken for the reaction to complete.
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In this practical, if the second trial uses 10 cm3 of sodium thiosulfate solution, 20 cm3 of water should be added to make the investigation a fair test. This is because the total volume of solution (sodium thiosulfate + water) should remain constant.
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When investigating the rate of reaction, if one variable increases as the other decreases, the relationship between the two variables is inversely proportional.
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