Practical 7b: Measuring the rate of reaction by continuous monitoring 0.0 / 5 ? ChemistryCalculationsRatesReactionsA2/A-levelAQA Created by: jamey_brewsterCreated on: 23-04-19 16:05 What must be true for measurement of a change in volume of a gas to represent the rate of reaction? There must be a change in the number of moles of gas in the reaction. 1 of 6 What is used to measure the change in volume of gas? A gas syringe 2 of 6 How is the initial rate determined from a concentration - time graph? Gradient at T=0 3 of 6 Why is comparing initial rates the most accurate way of comparing rates at different concentrations? The exact concentrations of reactants are known at the start of the reaction. 4 of 6 How is the change in volume of gas measured using a gas syringe? Record the volume of gas collected/used (reading on the gas syringe) at regular intervals (e.g. every 15 seconds) until the reaction stops. 5 of 6 Why will a reactant appear to be zero order when in a large excess, even when it isn't? Its concentration will stay close to constant, and so will not affect rate. 6 of 6
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