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CIE 2012 Oct/Nov discussion!!!

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I know!!!! *fingers crossed*!!!! :p And i usually score better in 4 than 2.... And hopefully the same should happen now!!!!!! :)
 
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But in the qtion we are preparing for gas, so i think zinc is a better choice because as it react with dl HCL it will form hydrogen gas.
 
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even i wrote zinc..

anyways: why was the zinc reweighed?
why was there a reduction in the mass of ZnO
 
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It's reweighed in order to improve realibilty. Reduce in weigh because some of it evaporate to the air and dissolve in the solution during the process.
 
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