Chemical Equations and Reactions
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Chemical Equations and Reactions

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Questions and Answers

What is released when silver chloride decomposes under sunlight?

  • Hydrogen
  • Oxygen
  • Chlorine (correct)
  • Nitrogen

    • Which form of energy is responsible for the decomposition of silver bromide?

  • Chemical energy
  • Light (correct)
  • Heat
  • Kinetic energy

    • What type of reaction occurs when the barium hydroxide and ammonium chloride are mixed?

  • Redox
  • Endothermic (correct)
  • Photochemical
  • Exothermic

    • Which equation represents the decomposition of silver chloride?

    <p>2AgCl(s) → Ag(s) + Cl2(g)</p> Signup and view all the answers

    In black and white photography, which reaction is utilized?

    <p>Decomposition of silver bromide</p> Signup and view all the answers

    What is the state of silver before the decomposition of silver chloride occurs?

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

    What is the chemical formula for the substance used in whitewashing?

    <p>Ca(OH)2</p> Signup and view all the answers

    What happens to ferrous sulphate crystals when they are heated?

    <p>They change color and decompose.</p> Signup and view all the answers

    What is the solid product formed from the decomposition of ferrous sulphate?

    <p>Ferric oxide</p> Signup and view all the answers

    What type of reaction occurs when ferrous sulphate decomposes upon heating?

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

    What characteristic odor might be detected during the heating of ferrous sulphate?

    <p>Burning sulfur</p> Signup and view all the answers

    What are the gaseous products formed in the decomposition of ferrous sulphate?

    <p>Sulfur dioxide and sulfur trioxide</p> Signup and view all the answers

    What is the name of the solid product formed from the thermal decomposition of calcium carbonate?

    <p>Quick lime</p> Signup and view all the answers

    What is indicated by the reaction of calcium carbonate when it breaks down upon heating?

    <p>It is a type of thermal decomposition reaction.</p> Signup and view all the answers

    What is the chemical formula for ferric oxide produced from the decomposition of ferrous sulphate?

    <p>Fe2O3</p> Signup and view all the answers

    What is the purpose of using chemical formulae in a chemical equation?

    <p>To make equations shorter and more informative</p> Signup and view all the answers

    In a balanced chemical equation, what must be true about the number of atoms of each element?

    <p>They must remain the same before and after the reaction</p> Signup and view all the answers

    Which of the following is a characteristic of a skeletal chemical equation?

    <p>It does not have equal numbers of atoms on both sides</p> Signup and view all the answers

    What does the arrow in a chemical equation signify?

    <p>The direction of the reaction towards products</p> Signup and view all the answers

    What equation represents the burning of magnesium in air using its chemical formula?

    <p>Mg + O2 → MgO</p> Signup and view all the answers

    How do you identify whether a chemical equation is balanced or unbalanced?

    <p>By counting the number of atoms of each element on both sides</p> Signup and view all the answers

    What results from not balancing a skeletal chemical equation?

    <p>Violation of the law of conservation of mass</p> Signup and view all the answers

    Which of the following represents the word-equation for a reaction involving zinc and sulfuric acid?

    <p>Zinc + Sulphuric acid → Zinc sulphate + Hydrogen</p> Signup and view all the answers

    What does it mean for a chemical equation to be balanced?

    <p>The number of atoms of each type is the same on both sides.</p> Signup and view all the answers

    Which type of reaction involves two or more substances combining to form a new single substance?

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

    What type of reaction occurs when a single substance decomposes to give two or more substances?

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

    Which statement correctly defines an exothermic reaction?

    <p>It releases heat along with products.</p> Signup and view all the answers

    In a displacement reaction, what happens?

    <p>An element replaces another element in a compound.</p> Signup and view all the answers

    What characterizes a double displacement reaction?

    <p>Two different atoms or groups are exchanged.</p> Signup and view all the answers

    What is oxidation in terms of chemical reactions?

    <p>Gain of oxygen or loss of hydrogen.</p> Signup and view all the answers

    What is produced when dilute hydrochloric acid reacts with iron fillings?

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

    What are the products of the reaction between potassium metal and water?

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

    What is formed when barium chloride reacts with aluminium sulphate?

    <p>Aluminium chloride and a precipitate of barium sulphate</p> Signup and view all the answers

    What type of reaction is represented by the equation, H2 + Cl2 → 2HCl?

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

    Which of the following correctly represents a decomposition reaction?

    <p>2H2O → 2H2 + O2</p> Signup and view all the answers

    What type of reaction involves the formation of a precipitate?

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

    In which reaction does respiration occur, highlighting its exothermic nature?

    <p>C6H12O6 + 6O2 → 6CO2 + 6H2O + energy</p> Signup and view all the answers

    What happens in a double displacement reaction?

    <p>Two compounds react to form two new compounds</p> Signup and view all the answers

    What is an example of an endothermic reaction?

    <p>Barium hydroxide and ammonium thiocyanate dissolving</p> Signup and view all the answers

    Study Notes

    Chemical Equations

    • Chemical equations represent chemical reactions.
    • Reactants are written on the left side with a plus sign (+) between them.
    • Products are written on the right side with a plus sign (+) between them.
    • The arrowhead points towards the products, showing the direction of the reaction.
    • Chemical equations can be made concise and useful if we use chemical formulas instead of words.
    • A skeletal chemical equation is an unbalanced equation.
    • In a balanced chemical equation, the number of atoms of each element on both sides of the arrow are the same.
    • When balancing a chemical equation, remember the law of conservation of mass: mass can neither be created nor destroyed in a chemical reaction.

    Types Of Chemical Reactions

    • Combination Reaction: Two or more substances combine to form a new single substance.
    • Decomposition Reactions: A single substance decomposes to give two or more substances. They are the opposite of combination reactions.
    • Displacement Reactions: An element displaces another element from its compound.
    • Double Displacement Reactions: Two different atoms or groups of atoms (ions) are exchanged.
    • Precipitation reactions: Reactions that produce insoluble salts.

    Energy Changes In Chemical Reactions

    • Exothermic reactions: Reactions in which heat is given out along with the products.
    • Endothermic reactions: Reactions in which energy is absorbed.

    Oxidation and Reduction

    • Oxidation: The gain of oxygen or loss of hydrogen.
    • Reduction: The loss of oxygen or gain of hydrogen.

    Examples of Reactions

    • Burning of magnesium in air: Mg + O2 → MgO
    • Reaction of zinc with sulfuric acid: Zn + H2SO4 → ZnSO4 + H2
    • Decomposition of ferrous sulfate (Heating changes the color of the crystals; you can smell sulfur): 2FeSO4(s) → Fe2O3(s) + SO2(g) + SO3(g)
    • Decomposition of calcium carbonate: CaCO3(s) → CaO(s) + CO2(g)
    • Decomposition of silver chloride in sunlight: 2AgCl(s) → 2Ag(s) + Cl2(g)
    • Decomposition of silver bromide in sunlight: 2AgBr(s) → 2Ag(s) + Br2(g) (used in black and white photography)
    • Reaction of barium hydroxide with ammonium chloride (feels cold, endothermic): Ba(OH)2 + 2NH4Cl → BaCl2 + 2NH3 + 2H2O
    • Reaction of dilute hydrochloric acid with iron fillings: Fe(s) + 2HCl(aq) → FeCl2(aq) + H2(g)
    • Recovery of silver from silver nitrate solution by copper metal: 2AgNO3(aq) + Cu(s) → Cu(NO3)2(aq) + 2Ag(s)
    • Reaction of potassium bromide with barium iodide: 2KBr(aq) + BaI2(aq) → 2KI(aq) + BaBr2(s)
    • Decomposition of zinc carbonate: ZnCO3(s) → ZnO(s) + CO2(g)
    • Reaction of hydrogen with chlorine: H2(g) + Cl2(g) → 2HCl(g)
    • Reaction of magnesium with hydrochloric acid: Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)

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    Jesc101 Chemical Reactions and Equations PDF

    Description

    This quiz covers the fundamentals of chemical equations, including their representation of chemical reactions, the distinction between skeletal and balanced equations, and important laws such as the conservation of mass. Additionally, various types of chemical reactions, such as combination and decomposition reactions, are explored.

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