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Chemistry Grade 10 Unit 1: Chemical Reactions and Stoichiometry

national exam questions have come from this unit. It runs 51 pages; one careful study pass takes about 5.9 hours, and its difficulty is harder among Chemistry units. Each section below lists the questions set from it, with the year, and opens the page that teaches it.

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1.1 Introduction · read p. 2
Not asked in a national paper yet.
1.2 Chemical Equations · read p. 3
Not asked in a national paper yet.
1.3 Types of Chemical Reactions · read p. 3
  • 2017 E.C., Q26 – Aluminum reacts with oxygen to form aluminum oxide. What is the coefficient of aluminum after balancing the reaction?
  • 2016 E.C., Q59 – Consider the following reaction of zinc carbonate, ZnCO 3 : ZnCO 3 (s) → ZnO(s) + CO 2 (g) The chemical reaction that takes place during the conversion of ZnCO 3 is classified as
  • 2016 E.C., Q56 – A type of reaction in which two compounds react together to form two or more products by exchanging reactants ions is known as _____________.
  • 2015 E.C., Q61 – "A reaction that involves the exchange of positive and negative ions of each reactant". This is a definition of a
  • 2014 E.C., Q22 – Consider the following chemical equation for the combustion of ethane (C 2 H 6 ) in the presence of oxygen to produce carbon dioxide and water: C 2 H 6 (g) + 7O 2 (g) → 4CO 2 (g) + 6H 2 O (l) In this reaction:
1.4 Oxidation and Reduction Reactions · read p. 20
  • 2018 E.C., Q34 – In a redox reaction: MnO₂ + 4HCl ⟶ MnCl₂ + Cl₂ + 2H₂O. Which of the following statements correctly identifies the roles of the reactants?
  • 2018 E.C., Q52 – Which of the following statements is NOT correctly describing oxidation and reduction?
  • 2017 E.C., Q34 – Which of the following reaction shows the action of as oxidizing agent? H SO 2 4
  • 2017 E.C., Q64 – Which statement below CORRECTLY distinguishes redox and non-redox reactions?
  • 2016 E.C., Q49 – Given the following oxidation-reduction reaction: H 2 S + HNO 3 → S + NO + H 2 O Which of the following is CORRECT from the given equation?
  • 2015 E.C., Q11 – What is a redox reaction? It is a reaction in which
  • 2015 E.C., Q34 – Which one of the following is the reducing agent in the following reaction? $8\mathrm{NH_3(g)}+6\mathrm{NO_2(g)}\to7\mathrm{N_2(g)}+12\mathrm{H_2O(l)}$
  • 2014 E.C., Q5 – What is oxidation? Oxidation is
  • 2012 E.C., Q41 – Which of the following is capable of acting both as an oxidizing and reducing agent?
  • 2009 E.C., Q65 – In the following reaction: 3Cl (aq) + 4CrO (aq) + 23H (aq) →3HClO (aq) + 4Cr (aq) + 10H O(l) − 4 2− + 2 3+ 2 Cl− What is the behaviour (aq)?
  • 2009 E.C., Q62 – In the reaction: $\mathrm{Pb} + (s),\ \mathrm{PbO_2} + \mathrm{H_2SO_4(aq)} \rightarrow 2\mathrm{PbSO_4(s)} + 2\mathrm{H_2O(l)}$ Which substance behaves as the oxidizing agent?
  • 2008 E.C., Q67 – Which of the following types of elements are good oxidizing agents?
  • 2006 E.C., Q42 – For which conversion is an oxidizing agent required?
1.5 Molecular and Formula Masses, the Mole Concept and Chemical Formulas · read p. 28
Not asked in a national paper yet.
1.6 Stoichiometry · read p. 34
  • 2018 E.C., Q35 – When 5.0 g of magnesium reacts with 20.0 g of oxygen gas according to the reaction: Mg(s) + O₂(g) → MgO(s), What is the mass of MgO that can be formed?
  • 2016 E.C., Q17 – Consider the following reaction between nitrogen (N 2 ) and oxygen (O 2 ): N 2 (g) + O 2 (g) → 2NO(g) If the rate of disappearance of N 2 is 2.5 x 10 -6 M/s, what is the rate of reaction for the formation of NO?
  • 2016 E.C., Q60 – Given the following reaction: CaCO 3 + HCl → CaCl 2 + CO 2 + H 2 O (unbalanced) If 40 g of CaCO 3 reacts with 30 g of HCl, which substance is the limiting and which is the excess reagent? (Atomic Mass: Ca=40 g/mol, C=12
  • 2015 E.C., Q64 – 180 g of calcium carbonate ($\mathrm{CaCO_3}$) is allowed to react with 156 gram of hydrochloric acid ($\mathrm{HCl}$), according to the following reaction. Which of the following substances is the limiting reagent? (Ato
  • 2014 E.C., Q21 – What is the mole ratio of oxygen gas to carbon dioxide gas in the following reaction? C 3 H 8 (g) + 5O 2 (g) → 3CO 2 (g) + 4H 2 O (l)
  • 2011 E.C., Q60 – If 49 grams of H₂SO₄ react with 80.0 grams of NaOH, how much reactant will be left over after the reaction is complete?
  • 2010 E.C., Q54 – Which of the following is NOT the decomposition product of $\mathrm{HNO_3}$?
  • 2006 E.C., Q15 – Butane burns in oxygen according to the equation below. . If 11.6g of butane is burned in 11.6 g of oxygen, which is the limiting reagent?