5.02 Quiz: Balancing Chemical Equations
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Which of the following shows the balanced equation for Ca + O2 → CaO?
2Ca + O2 → 2CaO.
Which of the following equations is balanced?
2Na + Cl2 → 2NaCl.
Which of the following is the balanced equation for P + O2 → P2O5?
4P + 5O2 → 2P2O5.
The equation 2NaNO3 + CaCl2 → 2NaCl + Ca(NO3)2 is balanced. How many atoms of oxygen are there on each side of the equation?
6.
Why must chemical equations be balanced?
To represent conservation of mass.
