Balanced Chemical EquationsOnline version 10 Std - Chemical Reactions and Equations by pifly .. 1 Why is it important to balance a chemical equation? a To reduce the reaction time b To satisfy the Law of Conservation of Energy c To satisfy the Law of Conservation of Mass d To make the equation look simple 2 Which of the following is a balanced chemical equation? a H₂ + Cl → HCl b Fe + H₂O → Fe₃O₄ + H₂ c Zn + H₂SO₄ → ZnSO₄ + H₂ d H₂ + O₂ → H₂O 3 What is a skeletal chemical equation? a A chemical equation with symbols and balanced atoms b An equation with incorrect chemical symbols c An unbalanced chemical equation d A chemical equation that uses word format 4 What is the physical state of water when used as steam in a reaction? a (l) b (g) c (aq) d (s) 5 Which of the following symbols represents an aqueous solution? a (g) b (aq) c (l) d (s) 6 What is the coefficient of Fe in the balanced equation: Fe + H₂O → Fe₃O₄ + H₂? a 1 b 2 c 3 d 4 7 What is the method used to balance chemical equations called? a Guessing method b Observation method c Hit-and-trial method d Equalization method 8 In the reaction: Fe + 4H₂O → Fe₃O₄ + 4H₂, which element is balanced last? a Oxygen b Hydrogen c Iron d Water 9 In the chemical equation Zn + H₂SO₄ → ZnSO₄ + H₂, which of the following is a product? a Zn b H₂SO₄ c H₂ d ZnSO₄ 10 What does the law of conservation of mass state? a Energy can neither be created nor destroyed b Mass remains constant if temperature is constant c Mass can be created during combustion d Mass can neither be created nor destroyed in a chemical reaction
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