Chemical Reactions and Equations
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Questions and Answers

What is the result of the equation 3*2?

  • 6 (correct)
  • 8
  • 9
  • 4

    • In the balanced equation Fe2O3 + 3CO → 2Fe + 3CO2, the oxidation state of Fe changes.

    True

    What is the oxidation number of As in the reactant H₃AsO₃?

    +3

    In the balanced equation 2HNO₃ + 3H₃AsO₃ → 2NO + 3H₃AsO₄ + H₂O, the change in oxidation number for As is ______________.

    <p>+2</p> Signup and view all the answers

    Match the following reactions with their types:

    <p>Fe2O3 + 3CO → 2Fe + 3CO2 = Redox Reaction HNO₃ + H₃AsO₃ → NO + H₃AsO₄ + H₂O = Redox Reaction Al + H2SO4 → Al2(SO4)3 + H2 = Redox Reaction KClO₃ → KCl + O₂ = Redox Reaction MnO₂ + Al → Mn + Al₂O₃ = Redox Reaction Cu + H2SO4 → CuSO4 + SO2 + H2O = Redox Reaction</p> Signup and view all the answers

    Non-redox reactions are chemical reactions where the oxidation states of chemical elements change.

    <p>False</p> Signup and view all the answers

    What is the purpose of step 5 in balancing a chemical equation?

    <p>To check whether each element is balanced.</p> Signup and view all the answers

    Which of the following reactions is a non-redox reaction?

    <p>None of the above</p> Signup and view all the answers

    What is the product of the reaction between hydrochloric acid and calcium carbonate?

    <p>Water, carbon dioxide, and calcium chloride</p> Signup and view all the answers

    Aluminum reacts with hydrochloric acid to form aluminum chloride and hydrogen gas.

    <p>True</p> Signup and view all the answers

    What is the type of reaction that occurs when silver oxide decomposes to silver and oxygen gas?

    <p>Decomposition reaction</p> Signup and view all the answers

    Iron(III) chloride reacts with ammonia to form iron(III) hydroxide and ______________.

    <p>ammonium chloride</p> Signup and view all the answers

    What is the purpose of balancing a chemical equation?

    <p>To ensure that the law of conservation of mass is obeyed</p> Signup and view all the answers

    Starch digestion is a building-up process.

    <p>False</p> Signup and view all the answers

    Match the following reactions with their types:

    <p>Combination reaction = 2H2 + O2 → 2H2O Decomposition reaction = 2H2O → 2H2 + O2 Single displacement reaction = Zn + CuSO4 → ZnSO4 + Cu Double displacement reaction = NaCl + AgNO3 → NaNO3 + AgCl</p> Signup and view all the answers

    What is the final product of protein digestion?

    <p>Amino acids</p> Signup and view all the answers

    What type of reaction takes place when an acid reacts with a metal hydroxide?

    <p>Double displacement reaction</p> Signup and view all the answers

    In the reaction BaCl2 + Na2SO4 → BaSO4 + 2NaCl, BaSO4 is soluble.

    <p>False</p> Signup and view all the answers

    What is the product of the reaction between sodium carbonate and hydrochloric acid?

    <p>Carbon dioxide gas</p> Signup and view all the answers

    When an active metal reacts with water, a _______________ reaction takes place.

    <p>single displacement</p> Signup and view all the answers

    What type of reaction is 2Cu(NO3)2 → 2CuO + 4NO2 + O2?

    <p>Decomposition reaction</p> Signup and view all the answers

    In the reaction CaCO3 + 2HCl → CaCl2 + CO2 + H2O, calcium carbonate is a limiting reactant.

    <p>False</p> Signup and view all the answers

    Match the following reactions with their types:

    <p>FeO + C → Fe + CO = Single displacement reaction 2NH3 + H2SO4 → (NH4)2SO4 = Combination reaction CuSO4.5H2O → CuSO4 + 5H2O = Dehydration reaction 2Na3PO4 + 3Ca(OH)2 → Ca3(PO4)2 + 6NaOH = Double displacement reaction</p> Signup and view all the answers

    Study Notes

    Chemical Reactions

    • Hydrochloric acid reacts with sodium carbonate to form sodium chloride, water, and carbon dioxide.
    • Potassium chlorate, when heated, produces potassium chloride and oxygen.
    • Calcium carbonate reacts with hydrochloric acid to form water, carbon dioxide, and calcium chloride.
    • Silver oxide decomposes to silver and oxygen gas.

    Balancing Chemical Equations

    • There are two methods to balance chemical equations: LCM (Lowest Common Multiple) and algebraic methods.
    • Examples of balancing equations using LCM method include:
      • Al + HCl → AlCl3 + H2
      • Fe2(SO4)3 + KOH → K2SO4 + Fe(OH)3
      • CaCl2 + Na3PO4 → Ca3(PO4)2 + NaCl
      • FeCl3 + NH4OH → Fe(OH)3 + NH4Cl
    • Examples of balancing equations using algebraic method include:
      • PCl5 + H2O → H3PO4 + HCl
      • Mg + H2O → Mg(OH)2 + H2
      • Zn(NO3)2 → ZnO + NO2 + O2
      • H2SO4 + NaOH → Na2SO4 + H2O
      • NH3 + O2 → NO + H2O
      • C6H12O6 + O2 → CO2 + H2O
      • FeCl3 + MgO → Fe2O3 + MgCl2
      • BaCl2 + K3PO4 → Ba3(PO4)2 + 6KCl
      • P4O10 + H2O → H3PO4

    Types of Chemical Reactions

    • There are four types of chemical reactions: combination, decomposition, single displacement, and double displacement reactions.
    • Combination reaction: a reaction where two or more substances combine to form a single product.
    • Decomposition reaction: a reaction where a single substance breaks down into two or more products.
    • Single displacement reaction: a reaction where one element displaces another element from a compound.
    • Double displacement reaction: a reaction where two compounds exchange partners, resulting in the formation of two new compounds.

    Digestive Protein and Starch

    • The final products of digestive protein and starch are amino acids and simple sugars, respectively.
    • Protein and starch digestion is a breaking down process.

    Oxidation and Reduction Reactions

    • Oxidation: a process where an atom, molecule, or ion loses one or more electrons.
    • Reduction: a process where an atom, molecule, or ion gains one or more electrons.
    • Oxidizing agent: a substance that causes oxidation to occur.
    • Reducing agent: a substance that causes reduction to occur.

    Balancing Redox Reactions

    • The oxidation number change method is used to balance redox reactions.
    • Steps to balance redox reactions include:
      • Identify the oxidation number of each atom.
      • Determine the change in oxidation number for each atom that changes.
      • Make the total increase in oxidation number equal to the total decrease in oxidation number.
      • Place coefficients in front of the formulas containing the atoms.

    Non-Redox Reactions

    • Non-redox reactions are chemical reactions where the oxidation states of chemical elements remain unchanged in reactants and products.

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    Chemistry Grade 10 Student Textbook PDF

    Description

    This quiz tests your knowledge of chemical reactions, equations, and balancing methods. It covers various chemical reactions, including acid-base reactions and decomposition reactions, and requires you to balance equations using the LCM method.

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