Chemical Equations

Chemistry ⇒ Chemical Reactions and Equations

Chemical Equations starts at 7 and continues till grade 12. QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Chemical Equations. How you perform is determined by your score and the time you take. When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.

See sample questions for grade 12

A reaction is represented as: 2H₂ + O₂ → 2H₂O. If 4 moles of hydrogen react, how many moles of water are produced?

Balance the following chemical equation: __Fe + __O₂ → __Fe₂O₃

Balance the following equation: __Al + __HCl → __AlCl₃ + __H₂

Balance the following equation: __C₂H₆ + __O₂ → __CO₂ + __H₂O

Balance the following equation: __C₃H₈ + __O₂ → __CO₂ + __H₂O

Balance the following equation: __FeS₂ + __O₂ → __Fe₂O₃ + __SO₂

Balance the following equation: __KClO₃ → __KCl + __O₂

Balance the following equation: __Na + __H₂O → __NaOH + __H₂

Balance the following equation: __NH₃ + __O₂ → __NO + __H₂O

Balance the following equation: __Pb(NO₃)₂ + __KI → __PbI₂ + __KNO₃

Describe the steps involved in balancing a chemical equation.

Explain the importance of balancing chemical equations in chemical calculations.

Explain why it is incorrect to balance a chemical equation by changing the subscripts in the chemical formulas.

In a chemical equation, what does the symbol '→' represent?

In the reaction: 2KClO₃ → 2KCl + 3O₂, how many moles of O₂ are produced from 4 moles of KClO₃?

State the difference between a skeletal equation and a balanced chemical equation.

What does the symbol (aq) indicate in a chemical equation?

Write the balanced chemical equation for the reaction between hydrochloric acid and sodium hydroxide.

A reaction is represented as: 2Al + 3CuSO₄ → Al₂(SO₄)₃ + 3Cu. If 27 g of Al (atomic mass = 27) reacts completely, what mass of copper (atomic mass = 63.5) will be produced?

A student writes the following ionic equation: Ba²⁺ (aq) + SO₄^2- (aq) → BaSO₄ (s). Is this equation balanced in terms of both mass and charge? Explain your answer.