balancing equations test 1

For all of these questions you have to fill in the co-efficients only.
There is four for every question (If the co-efficient is one then put in the number one). You list them in order.
Eg For the unbalanced equation: CH4 + O2 -> CO2 + H20
The correct answer is:
1212

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The total time allowed for this quiz is 30 minutes.

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