Chemistry Chapter: Chemical Reactions Quiz
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Questions and Answers

Which of the following conditions is NOT necessary for a chemical reaction to occur?

  • Presence of a catalyst (correct)
  • Close contact between reactants
  • The formation of a new substance
  • A change in temperature

    • What is the purpose of storing sodium in kerosene oil?

  • To make the sodium easier to handle
  • To keep the sodium from oxidizing
  • To prevent the sodium from reacting with air
  • To prevent the sodium from reacting with water (correct)

    • In Activity 8, why does mixing solid sodium chloride and solid lead nitrate NOT result in a chemical reaction?

  • There is not enough surface area between the reactants
  • The reactants are not in a suitable form for reaction (correct)
  • The reactants are incompatible and cannot react
  • The reactants do not have enough energy to react

    • What is the chemical formula for the white precipitate formed in Activity 8?

    <p>PbCl2</p> Signup and view all the answers

    Which of the following is NOT an example of a chemical reaction in solution?

    <p>The reaction between two gases</p> Signup and view all the answers

    What gas is produced when ammonium chloride is heated with sodium hydroxide?

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

    Which gas is known for having a rotten egg smell when released during a chemical reaction?

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

    In photosynthesis, is energy released or absorbed?

    <p>Energy is absorbed in the form of heat and light</p> Signup and view all the answers

    Which of these describe a reaction that releases energy?

    <p>Exothermic Reaction</p> Signup and view all the answers

    What process describes a reaction where energy is absorbed?

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

    What is the primary role of a catalyst in a chemical reaction?

    <p>To change the rate of the reaction without being consumed.</p> Signup and view all the answers

    In a chemical equation, which side are the reactants written on?

    <p>The left-hand side</p> Signup and view all the answers

    Which of the following best describes the purpose of the arrow in a chemical equation?

    <p>To point from reactants to products.</p> Signup and view all the answers

    Which of these is not a condition that can directly affect a chemical reaction?

    <p>Volume of solution</p> Signup and view all the answers

    What is a reaction that require electricity in order to take place?

    <p>The dissociation of water</p> Signup and view all the answers

    Which of the following is NOT a typical indication of a chemical reaction?

    <p>Change in the state of matter</p> Signup and view all the answers

    In the reaction of sodium carbonate with dilute hydrochloric acid, what is the primary gas produced?

    <p>Carbon Dioxide</p> Signup and view all the answers

    What does effervescence usually indicate in a chemical reaction?

    <p>Release of a gas</p> Signup and view all the answers

    Based on the examples provided, what usually happens to mercuric oxide when heated?

    <p>It decomposes into mercury and oxygen</p> Signup and view all the answers

    Which of the following is NOT an example of a chemical reaction provided in the text?

    <p>Water undergoing a phase change to steam at 100 $^\circ$C</p> Signup and view all the answers

    What are substances called that undergo a chemical change?

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

    Which of the following best describes the outcome of a chemical reaction?

    <p>Molecules rearrange to create one or more products.</p> Signup and view all the answers

    What do we call the new substances formed in a chemical reaction?

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

    Which example illustrates a chemical reaction?

    <p>Burning a candle</p> Signup and view all the answers

    What is involved in a chemical reaction besides the transformation of substances?

    <p>Energy transfer</p> Signup and view all the answers

    What observation indicates that a chemical reaction has occurred when iron is mixed with copper sulfate solution?

    <p>A reddish-brown solid is formed.</p> Signup and view all the answers

    What is produced when sugar is heated in a porcelain dish?

    <p>Sugar charcoal and water vapor.</p> Signup and view all the answers

    What observable change occurs when copper carbonate is heated?

    <p>It turns into a black solid and releases gas.</p> Signup and view all the answers

    Which of the following describes a characteristic of chemical reactions involving gas evolution?

    <p>Bubbles, smell, or color change can indicate gas production.</p> Signup and view all the answers

    What happens when zinc granules react with dilute hydrochloric acid?

    <p>Bubbles are produced indicating gas evolution.</p> Signup and view all the answers

    What does a balanced chemical equation ensure about the atoms involved in a chemical reaction?

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

    Which statement is true about skeletal equations?

    <p>They represent reactions without needing balance.</p> Signup and view all the answers

    What is the purpose of using symbols and formulae in chemical equations?

    <p>To save time and space while clearly showing reactions.</p> Signup and view all the answers

    Why is it necessary to use molecular forms like H₂ and Cl₂ for hydrogen and chlorine in chemical equations?

    <p>To accurately reflect their natural existence in reactions.</p> Signup and view all the answers

    In a chemical reaction represented by the equation C + O₂ → CO₂, which statement is correct regarding the atom count?

    <p>The number of oxygen atoms is greater in the products than in the reactants.</p> Signup and view all the answers

    What is the purpose of mixing baking soda with vinegar in the experiment?

    <p>To evolve carbon dioxide gas</p> Signup and view all the answers

    What type of reaction occurs when potassium iodide is mixed with lead acetate?

    <p>A precipitation reaction</p> Signup and view all the answers

    Which observation indicates that a gas has been evolved in the baking soda and vinegar experiment?

    <p>Formation of bubbles</p> Signup and view all the answers

    In the reaction involving barium chloride and sodium sulfate, what is the product formed?

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

    What type of solid is produced during a precipitation reaction?

    <p>Insoluble solid</p> Signup and view all the answers

    What is observed when hydrochloric acid reacts with ammonia?

    <p>Generation of a white fume</p> Signup and view all the answers

    When hydrogen gas burns in oxygen, which of the following is produced?

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

    What does effervescence indicate in a chemical reaction?

    <p>A gas is being released</p> Signup and view all the answers

    Study Notes

    Chemical Reactions

    • Chemical reactions involve a change in matter resulting in one or more new substances.
    • Energy transfer also occurs during chemical reactions.
    • Example of a chemical reaction: burning a candle. Wax burns in air to produce carbon dioxide and water vapour, and releases light and heat energy.
    • Substances undergoing a chemical change are called reactants.
    • The new substances produced are called products.
    • Both reactants and products are pure substances.

    Conditions Necessary for Chemical Reactions

    • Close contact: Reactants need to come in close contact (mixed together) for a reaction to occur.
    • Example: Sodium reacts with water violently when they come into contact.

    Change of Energy

    • Chemical reactions are often accompanied by a change in energy.
    • Energy can be released (exothermic) or absorbed (endothermic).
    • Energy can be in the form of heat, light, or electricity.
    • Example of an exothermic reaction: Burning of Magnesium.
    • Example of an endothermic reaction: Photosynthesis.

    Catalyst

    • A catalyst is a substance that speeds up or slows down a chemical reaction without changing itself.
    • Different chemical substances are used as catalysts in different chemical reactions.

    Chemical Equations

    • Chemical equations use symbols to represent elements and compounds in a reaction.
    • Reactants are written on the left side of the equation and products on the right-hand side.
    • An arrow points from reactants to products.
    • Example: Reactants (A) + (B) → Products (C) + (D).

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    Description

    Test your knowledge on chemical reactions with this quiz. Questions cover essential concepts such as reactants, energy changes, and the role of catalysts. Perfect for students studying chemistry concepts related to reactions and their conditions.

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