In reaction 1, 12g of reactants were converted to products in 30 seconds. In reaction 2, 200g of reactants were converted to products in 8 minutes. Which reaction happened at the faster rate?

An enzyme-catalyzed reaction was carried out with the substrate concentration initially a thousand times greater than the Km for that substrate. After 21 seconds, 1% of the substrate had been converted to product, and the amount of product formed in the reaction mixture was 12 mmol. If, in a separate experiment, 1/2 times as much enzyme was used. How long (sec) would it take for the same amount (12 mmol) of product to be formed?

Which of the following is NOT true regarding reaction time?

The forward reaction goes faster than the reverse reactionProducts are made from reactants faster than products turn back into reactantsThe reverse reaction goes faster than the forward reactionProducts are made from reactants at the same rate that products are turned back into reactantsThe rates of the forward and reverse reactions are equal.Products are made from reactants slower than products turn back into reactants

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

n enzyme-catalysed reaction was carried out and after 9 minutes the amount of product formed in the reaction mixture was 12mM. If, in a separate experiment, one-third as much enzyme was used, how long would it take for the same amount (12mM) of product to be formed?Selected Answer: [None Given]Answers: A. 1.5min.B. 24min.C. 27min.D. 13.5min.E. 3.0min