How did Chemistry M/J '17 52 go?

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Lets discuss! 24 hours have passed. So what were the independant and dependant variables? I wrote independant: type of lead oxide dependant : mass of oxygen produced.
 
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Lets discuss! 24 hours have passed. So what were the independant and dependant variables? I wrote independant: type of lead oxide dependant : mass of oxygen produced.
gosh!
this paper went bad for me or so I believe gotta work hard in paper 4
did the answer support that law thing?
question 1 was heck
 
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Guys please tell me if I score bad in P4 and A in all other components then can I get A??
 
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