The rate of reaction between magnesium and hydrochloric acid is investigated.
The total volume of hydrogen given off is measured at different times.
A graph of the results is shown.
Which conclusions are correct?
1- The rate is fastest between 0 and 30 seconds.
2- The maximum volume of hydrogen given off is 22 cm$^3$.
3- At 40 seconds, 20 cm$^3$ of hydrogen is given off.
1 and 2 only
2 )
1 and 3 only
3 )
2 and 3 only
4 )
1, 2 and 3
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