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[Music] hi and welcome back to free science lessons by the end of this video you should be able to describe whats meant by repeatable measurements and reproducible measurements okay now during your gcse science lessons youll carry out a number of required practicals and one of these is the rates of reaction practical in chemistry in this practical you investigate how the rate of a chemical reaction is affected by the concentration of a reactant and remember that a reactant is a chemical that takes part in a reaction one way of doing this is by measuring the volume of a gas produced and im showing you that here were reacting marble chips with acid which produces the gas carbon dioxide and were trapping the carbon dioxide in an upturned measuring cylinder in a trough of water we can read the volume of gas using the scale on the measuring cylinder now one way of doing this practical is by adding a certain concentration of acid to the marble chips and then timing how long it takes to
