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3.x Balancing Equations (Year 10 Chemistry)

The following test is covering '3.x Balancing Equations' for Year 10 Chemistry.
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Question 1
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Balance this equation: Na2CO3 ? Na2O + CO2
Balance this equation: Na2O + H2O ? NaOH
Balance this equation: K + O2 ? K2O
Balance this equation: NH3 + O2 ? NO + H2O
Balance this equation: Ca + O2 ? CaO
Balance this equation: F2 + KBr ? KF + Br2
Balance this equation: C4H8 + O2 ? CO2 + H2O