A student investigates the rate of reaction between marble chips and hydrochloric acid.
The mass of the reaction flask is measured.
The graph shows the results of two experiments, P and Q.
Which change explains the difference between P and Q?
1 )
A catalyst is added in P.
2 )
A higher temperature is used in P.
3 )
Bigger marble chips are used in Q.
Hydrochloric acid is more concentrated in Q.
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