Chemical Reactions and Equations: Chapter 1 C
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Questions and Answers

What happens when milk is left at room temperature during summers?

  • It evaporates completely
  • It turns into yogurt
  • It spoils due to bacterial action (correct)
  • It becomes thicker and creamier

    • What happens when an iron tawa/pan/nail is left exposed to humid atmosphere?

  • It becomes lighter in weight
  • It develops a layer of protective coating
  • It becomes cleaner and shinier
  • It rusts due to oxidation (correct)

    • What happens when grapes get fermented?

  • They become sweeter
  • They become juicier
  • They shrink and become smaller
  • They produce alcohol and carbon dioxide (correct)

    • What happens when food gets digested in our body?

    <p>It changes into waste material for excretion</p> Signup and view all the answers

    What do we observe when we respire?

    <p>We inhale oxygen and exhale carbon dioxide</p> Signup and view all the answers

    What happens when a magnesium ribbon is burned using a spirit lamp or burner?

    <p>It forms ash and emits light</p> Signup and view all the answers

    What is the product formed when a magnesium ribbon burns in oxygen?

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

    What is the product formed when lead nitrate solution is mixed with potassium iodide solution?

    <p>Lead iodide</p> Signup and view all the answers

    In the context of chemical reactions, what does a word-equation represent?

    <p>Formation of products from reactants</p> Signup and view all the answers

    Which substances are referred to as the reactants in a chemical equation?

    <p>The substances that undergo chemical change in the reaction</p> Signup and view all the answers

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

    <p>To make the equation more concise and useful</p> Signup and view all the answers

    Which observation helps determine whether a chemical reaction has taken place?

    <p>Change in color</p> Signup and view all the answers

    What is formed when dilute sulfuric acid reacts with zinc granules?

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

    What does the arrow in a chemical equation represent?

    <p>The direction in which the reactants are moving</p> Signup and view all the answers

    What should be placed between the reactants and products in a word-equation?

    <p>'→' (arrow)</p> Signup and view all the answers

    What happens when magnesium ribbon burns in oxygen?

    <p>It forms magnesium oxide</p> Signup and view all the answers

    Study Notes

    Effects of Temperature and Humidity

    • When milk is left at room temperature during summers, it spoils and becomes unhealthy for consumption.
    • When an iron tawa/pan/nail is left exposed to humid atmosphere, it rusts.

    Fermentation

    • When grapes get fermented, they convert into wine through a chemical reaction.

    Digestion

    • When food gets digested in our body, it breaks down into simpler substances that can be absorbed and utilized by the body.

    Respiration

    • When we respire, we observe the exchange of oxygen and carbon dioxide between the body and the environment.

    Combustion Reaction

    • When a magnesium ribbon is burned using a spirit lamp or burner, it catches fire and combines with oxygen.
    • The product formed when a magnesium ribbon burns in oxygen is magnesium oxide.

    Precipitation Reaction

    • When lead nitrate solution is mixed with potassium iodide solution, a yellow precipitate of lead iodide is formed.

    Chemical Reactions

    • A word-equation represents a chemical reaction in which reactants are converted into products.
    • The reactants in a chemical equation are the substances that undergo a chemical change.
    • The key purpose of using chemical formulae instead of words in a chemical equation is to provide a concise and accurate representation of the reaction.

    Identifying Chemical Reactions

    • A change in color, odor, or formation of a precipitate or gas helps determine whether a chemical reaction has taken place.

    Single Displacement Reaction

    • When dilute sulfuric acid reacts with zinc granules, hydrogen gas is formed and zinc sulfate is produced.

    Chemical Equation Notations

    • The arrow in a chemical equation represents the direction of the reaction.
    • A plus sign (+) should be placed between the reactants and products in a word-equation.

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    Description

    Test your knowledge on chemical reactions and equations with this quiz focusing on daily life situations involving milk, iron, fermentation, cooking, digestion, and respiration. Explore the nature and identity of substances in various scenarios.

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