Balancing Chemical Equations
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Questions and Answers

What is produced when dilute hydrochloric acid is added to iron fillings?

  • Chlorine gas and iron hydroxide
  • No reaction takes place
  • Iron salt and water
  • Hydrogen gas and iron chloride (correct)

    • What is a balanced chemical equation?

  • An equation where the mass and the charge balance on both sides (correct)
  • An equation where the products are greater than the reactants
  • An equation where energy is absorbed
  • An equation where the number of molecules on both sides is equal

    • What type of reaction produces water and sulfur dioxide from hydrogen sulfide gas?

  • Combination reaction
  • Decomposition reaction
  • Displacement reaction
  • Combustion reaction (correct)

    • What is produced when barium chloride reacts with aluminum sulfate?

    <p>Barium sulfate and aluminum chloride</p> Signup and view all the answers

    Which of the following is the balanced equation for the reaction of calcium hydroxide with carbon dioxide?

    <p>$Ca(OH)_2 + CO_2 \to CaCO_3 + H_2O$</p> Signup and view all the answers

    Which type of reaction is identified by combining magnesium with hydrochloric acid to produce magnesium chloride and hydrogen?

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

    Why is respiration considered an exothermic reaction?

    <p>Because it releases heat</p> Signup and view all the answers

    Why are decomposition reactions called the opposite of combination reactions?

    <p>Because decomposition reactions break compounds into simpler substances while combination reactions form compounds from simpler substances</p> Signup and view all the answers

    What are the products of the reaction between barium chloride and potassium sulphate?

    <p>Barium sulphate and potassium chloride</p> Signup and view all the answers

    Which type of reaction occurs when hydrogen gas burns in air?

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

    Which of the following signifies an exothermic reaction?

    <p>Burning of natural gas</p> Signup and view all the answers

    What gas is produced when zinc reacts with hydrochloric acid?

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

    Which of the following reactions is a decomposition reaction?

    <p>Zinc carbonate → Zinc oxide + Carbon dioxide</p> Signup and view all the answers

    Which outcome is expected when calcium hydroxide reacts with carbon dioxide?

    <p>Calcium carbonate and water</p> Signup and view all the answers

    Which of the following correctly identifies the products of the reaction between hydrogen and chlorine?

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

    What is the product when potassium reacts with water?

    <p>Potassium hydroxide and hydrogen</p> Signup and view all the answers

    Study Notes

    Chemical Reactions and Equations

    • When dilute hydrochloric acid is added to iron fillings, hydrogen gas and iron chloride are produced.

    Balanced Chemical Equations

    • A balanced chemical equation is an equation that has the same number of atoms of each element on both the reactant and product sides.
    • Chemical equations should be balanced to ensure that the law of conservation of mass is upheld.

    Chemical Equations and Reactions

    • Hydrogen gas combines with nitrogen to form ammonia: N2 + 3H2 → 2NH3
    • Hydrogen sulphide gas burns in air to give water and sulfur dioxide: 2H2S + 3O2 → 2H2O + 2SO2
    • Barium chloride reacts with aluminum sulfate to give aluminum chloride and a precipitate of barium sulfate: 3BaCl2 + Al2(SO4)3 → 2AlCl3 + 3BaSO4
    • Potassium metal reacts with water to give potassium hydroxide and hydrogen gas: 2K + 2H2O → 2KOH + H2

    Balancing Chemical Equations

    • HNO3 + Ca(OH)2 → Ca(NO3)2 + 2H2O
    • 2NaOH + H2SO4 → Na2SO4 + 2H2O
    • NaCl + AgNO3 → AgCl + NaNO3
    • BaCl2 + H2SO4 → BaSO4 + 2HCl

    Chemical Reactions and Equations

    • Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water: Ca(OH)2 + CO2 → CaCO3 + H2O
    • Zinc + Silver nitrate → Zinc nitrate + Silver: Zn + 2AgNO3 → Zn(NO3)2 + 2Ag
    • Aluminium + Copper chloride → Aluminium chloride + Copper: 2Al + 3CuCl2 → 2AlCl3 + 3Cu
    • Barium chloride + Potassium sulphate → Barium sulphate + Potassium chloride: BaCl2 + K2SO4 → BaSO4 + 2KCl

    Reaction Types

    • Potassium bromide(aq) + Barium iodide(aq) → Potassium iodide(aq) + Barium bromide(s) (Precipitation reaction)
    • Zinc carbonate(s) → Zinc oxide(s) + Carbon dioxide(g) (Decomposition reaction)
    • Hydrogen(g) + Chlorine(g) → Hydrogen chloride(g) (Combination reaction)
    • Magnesium(s) + Hydrochloric acid(aq) → Magnesium chloride(aq) + Hydrogen(g) (Single displacement reaction)

    Exothermic and Endothermic Reactions

    • Exothermic reaction: A reaction that releases heat energy, e.g., combustion reactions.
    • Endothermic reaction: A reaction that absorbs heat energy, e.g., decomposition reactions.
    • Respiration is considered an exothermic reaction because it releases heat energy.

    Combination and Decomposition Reactions

    • Combination reaction: A reaction in which two or more substances combine to form a single product, e.g., 2H2 + O2 → 2H2O.
    • Decomposition reaction: A reaction in which a single substance breaks down into two or more products, e.g., 2H2O → 2H2 + O2.

    Chemical Reactions and Equations

    • When dilute hydrochloric acid is added to iron fillings, hydrogen gas and iron chloride are produced.

    Balanced Chemical Equations

    • A balanced chemical equation is an equation that has the same number of atoms of each element on both the reactant and product sides.
    • Chemical equations should be balanced to ensure that the law of conservation of mass is upheld.

    Chemical Equations and Reactions

    • Hydrogen gas combines with nitrogen to form ammonia: N2 + 3H2 → 2NH3
    • Hydrogen sulphide gas burns in air to give water and sulfur dioxide: 2H2S + 3O2 → 2H2O + 2SO2
    • Barium chloride reacts with aluminum sulfate to give aluminum chloride and a precipitate of barium sulfate: 3BaCl2 + Al2(SO4)3 → 2AlCl3 + 3BaSO4
    • Potassium metal reacts with water to give potassium hydroxide and hydrogen gas: 2K + 2H2O → 2KOH + H2

    Balancing Chemical Equations

    • HNO3 + Ca(OH)2 → Ca(NO3)2 + 2H2O
    • 2NaOH + H2SO4 → Na2SO4 + 2H2O
    • NaCl + AgNO3 → AgCl + NaNO3
    • BaCl2 + H2SO4 → BaSO4 + 2HCl

    Chemical Reactions and Equations

    • Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water: Ca(OH)2 + CO2 → CaCO3 + H2O
    • Zinc + Silver nitrate → Zinc nitrate + Silver: Zn + 2AgNO3 → Zn(NO3)2 + 2Ag
    • Aluminium + Copper chloride → Aluminium chloride + Copper: 2Al + 3CuCl2 → 2AlCl3 + 3Cu
    • Barium chloride + Potassium sulphate → Barium sulphate + Potassium chloride: BaCl2 + K2SO4 → BaSO4 + 2KCl

    Reaction Types

    • Potassium bromide(aq) + Barium iodide(aq) → Potassium iodide(aq) + Barium bromide(s) (Precipitation reaction)
    • Zinc carbonate(s) → Zinc oxide(s) + Carbon dioxide(g) (Decomposition reaction)
    • Hydrogen(g) + Chlorine(g) → Hydrogen chloride(g) (Combination reaction)
    • Magnesium(s) + Hydrochloric acid(aq) → Magnesium chloride(aq) + Hydrogen(g) (Single displacement reaction)

    Exothermic and Endothermic Reactions

    • Exothermic reaction: A reaction that releases heat energy, e.g., combustion reactions.
    • Endothermic reaction: A reaction that absorbs heat energy, e.g., decomposition reactions.
    • Respiration is considered an exothermic reaction because it releases heat energy.

    Combination and Decomposition Reactions

    • Combination reaction: A reaction in which two or more substances combine to form a single product, e.g., 2H2 + O2 → 2H2O.
    • Decomposition reaction: A reaction in which a single substance breaks down into two or more products, e.g., 2H2O → 2H2 + O2.

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    Test your understanding of chemical reactions and equations with these multiple-choice questions. Learn how to balance chemical equations and why it's important.

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