When a piece of marble is added to hydrochloric acid, bubbles of carbon dioxide gas are given
off.
Which method is used to find the rate of the reaction?
1 )
counting the number of gas bubbles formed
2 )
measuring the diameter of the gas bubbles
3 )
measuring the speed at which the gas bubbles rise upwards through the acid
measuring the time taken for $10c{m^3}$ of gas to be collected
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