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Chemistry Unit 1 Energy Matters help!

The answer for Q1 is D, could someone explain why?
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Original post by Needinhelp
The answer for Q1 is D, could someone explain why?


It's lump so it goes slower than powder.
There's half the mass so it makes half the volume of gas.
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Needinhelp
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Original post by charco
It's lump so it goes slower than powder.
There's half the mass so it makes half the volume of gas.


thanks, but how come its not C?
Original post by Needinhelp
thanks, but how come its not C?


Because lumps have a lower surface area to mass ratio than powder and so react more slowly ...
Original post by Needinhelp
thanks, but how come its not C?


C would be 0.5g of powder so it goes at the same rate at X at the start but only produces half the volume of gas.
D being a lump has a smaller surface area so reacts slower (shallower gradient) and only being 0.5g produces half as much gas.

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