Chemical Reactions and Equations Chapter 1
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Questions and Answers

What is the main reason for balancing a chemical equation?

  • To study the properties of elements
  • To follow the law of multiple proportions
  • To satisfy the law of conservation of mass (correct)
  • To obey the law of definite proportions

    • What type of chemical equation is Equation (1.2) according to the text?

  • A chemical reaction
  • A skeletal chemical equation (correct)
  • A balanced chemical equation
  • A word-equation

    • What is the purpose of drawing boxes around each formula in a chemical equation?

  • To satisfy the law of conservation of mass
  • To balance the chemical equation (correct)
  • To write the word-equation
  • To identify the reactants and products

    • Which element has the same number of atoms on both sides of the arrow in Equation (1.3)?

    <p>All of the above</p> Signup and view all the answers

    What is the result of not balancing a chemical equation?

    <p>The mass is not conserved</p> Signup and view all the answers

    What is the purpose of balancing a chemical equation?

    <p>To ensure the conservation of mass</p> Signup and view all the answers

    What is the characteristic of a balanced chemical equation?

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

    What is the difference between a word-equation and a chemical equation?

    <p>A word-equation is a sentence, while a chemical equation is a symbolic representation</p> Signup and view all the answers

    What is the purpose of rubbing the iron nails with sandpaper in Activity 1.9?

    <p>To clean the iron nails and remove any impurities</p> Signup and view all the answers

    What is the function of the thread in Activity 1.9?

    <p>To tie the two iron nails together</p> Signup and view all the answers

    What is observed in the copper sulphate solution in test tube B after 20 minutes?

    <p>The intensity of the blue colour decreases</p> Signup and view all the answers

    What is the purpose of keeping one iron nail aside in Activity 1.9?

    <p>To compare the colour of the iron nails</p> Signup and view all the answers

    What is the duration of time for which the iron nails are immersed in the copper sulphate solution in test tube B?

    <p>20 minutes</p> Signup and view all the answers

    What is the volume of the copper sulphate solution taken in each test tube?

    <p>10 mL</p> Signup and view all the answers

    What is compared in the copper sulphate solutions in test tubes A and B?

    <p>The intensity of the blue colour</p> Signup and view all the answers

    What is the name of the reaction that occurs in Activity 1.9?

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

    What is the end result of burning a magnesium ribbon in air?

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

    What is the purpose of wearing eye protection in Activity 1.1?

    <p>To protect the eyes from the white flame</p> Signup and view all the answers

    What is the primary reason for cleaning the magnesium ribbon with sandpaper?

    <p>To remove impurities from the surface</p> Signup and view all the answers

    What is a common characteristic of all the situations mentioned in the introduction?

    <p>They all involve chemical changes</p> Signup and view all the answers

    What is the term used to describe the process of milk turning sour when left at room temperature during summers?

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

    What is the purpose of collecting the ash in a watch-glass in Activity 1.1?

    <p>To collect the product of the chemical reaction</p> Signup and view all the answers

    What is the term used to describe the process of grapes turning into wine?

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

    Why is it necessary to perform Activity 1.1 under the teacher's supervision?

    <p>Because it involves handling hazardous materials</p> Signup and view all the answers

    What is the result of oxidation of copper?

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

    What happens to the copper(II) oxide during the reaction with hydrogen gas?

    <p>It loses oxygen</p> Signup and view all the answers

    What is the definition of oxidation?

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

    In reaction (1.31), what is the product of the oxidation of carbon?

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

    What is the type of reaction that occurs between copper oxide and hydrogen gas?

    <p>Oxidation-reduction reaction</p> Signup and view all the answers

    What is the result of the reduction of zinc oxide?

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

    What happens to the hydrogen during the reaction with copper oxide?

    <p>It is oxidized to water</p> Signup and view all the answers

    What is the definition of reduction?

    <p>Loss of oxygen or gain of hydrogen</p> Signup and view all the answers

    In the reaction 2Fe2O3 + 2Al → Al2O3 + 2Fe, which of the following is true?

    <p>Iron is getting reduced.</p> Signup and view all the answers

    What is the result of adding dilute hydrochloric acid to iron fillings?

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

    What is the purpose of a balanced chemical equation?

    <p>To ensure that the number of atoms of each element is the same on both sides.</p> Signup and view all the answers

    What is the correct balanced equation for the reaction of hydrogen gas with nitrogen to form ammonia?

    <p>3H2 + N2 → 2NH3</p> Signup and view all the answers

    What is the type of reaction that occurs between barium chloride and aluminium sulphate?

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

    What is the correct balanced equation for the reaction of calcium hydroxide with carbon dioxide to form calcium carbonate and water?

    <p>Ca(OH)2 + CO2 → CaCO3 + H2O</p> Signup and view all the answers

    What is the type of reaction that occurs between zinc and silver nitrate?

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

    What is the correct balanced equation for the reaction of barium chloride with potassium sulphate to form barium sulphate and potassium chloride?

    <p>BaCl2 + K2SO4 → BaSO4 + 2KCl</p> Signup and view all the answers

    Study Notes

    Chemical Reactions and Equations

    • Chemical reactions involve a change in the nature and identity of the initial substance, resulting in a new product.
    • Examples of chemical reactions in daily life include:
      • Milk spoiling when left at room temperature
      • Iron rusting when exposed to humid air
      • Grapes fermenting
      • Food cooking
      • Digestion of food in the body
      • Respiration

    Chemical Equations

    • A chemical equation is a representation of a chemical reaction using symbols and formulas.
    • A skeletal chemical equation is a basic representation of a chemical reaction that may not be balanced.
    • The law of conservation of mass states that mass cannot be created or destroyed in a chemical reaction, so the total mass of elements in the reactants must equal the total mass of elements in the products.
    • A balanced chemical equation is one in which the number of atoms of each element is the same on both sides of the equation.

    Balancing Chemical Equations

    • To balance a chemical equation, first draw boxes around each formula.
    • Count the number of atoms of each element on both sides of the equation and adjust the coefficients as necessary to make the equation balanced.

    Types of Chemical Reactions

    • Displacement reactions: a more reactive element displaces a less reactive element from a compound.
    • Oxidation-reduction reactions (redox reactions): one reactant is oxidized (loses electrons) while the other is reduced (gains electrons).
    • Examples of redox reactions include:
      • CuO + H2 → Cu + H2O
      • ZnO + C → Zn + CO
      • MnO2 + 4HCl → MnCl2 + 2H2O + Cl2

    Characteristics of Chemical Reactions

    • If a substance gains oxygen during a reaction, it is said to be oxidized.
    • If a substance loses oxygen during a reaction, it is said to be reduced.
    • Oxidation and reduction occur simultaneously in a redox reaction.

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    Description

    Explore the concept of chemical reactions and equations through everyday life scenarios, such as milk spoilage, iron rusting, fermentation, cooking, and digestion. Test your understanding of these chemical reactions and equations in this quiz.

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