Chemical Equations
Chemistry ⇒ Chemical Reactions and Equations
Chemical Equations starts at 7 and continues till grade 12.
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See sample questions for grade 11
A chemical equation is said to be balanced when:
A student writes the following equation: N2 + 3H2 → 2NH3. How many molecules of hydrogen are required to react with one molecule of nitrogen?
A student writes the following equation: Zn + HCl → ZnCl2 + H2. Is this equation balanced? If not, provide the balanced equation.
Balance the following equation: Al + HCl → AlCl3 + H2
Balance the following equation: C3H8 + O2 → CO2 + H2O
Balance the following equation: Fe + O2 → Fe2O3
Balance the following equation: H2SO4 + NaOH → Na2SO4 + H2O
Balance the following equation: Na + O2 → Na2O
Balance the following equation: Pb(NO3)2 + KI → PbI2 + KNO3
Explain the difference between a word equation and a chemical equation.
Explain why it is important to indicate the physical states of reactants and products in a chemical equation.
Explain why subscripts in chemical formulas should not be changed when balancing chemical equations.
State the law that requires chemical equations to be balanced.
What does the symbol (aq) represent in a chemical equation?
