Chemical Reactions and Equations Quiz
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Questions and Answers

What is the nature of change observed when milk is left at room temperature during summers?

  • Biological change
  • No change
  • Physical change
  • Chemical change (correct)

    • When an iron tawa/pan/nail is left exposed to humid atmosphere, what kind of change occurs?

  • No change
  • Chemical change (correct)
  • Electrical change
  • Physical change

    • What kind of change occurs when grapes get fermented?

  • No change
  • Physical change
  • Chemical change (correct)
  • Biological change

    • What type of change takes place when food is cooked?

    <p>Chemical change</p> Signup and view all the answers

    In which type of change does food get digested in our body?

    <p>Chemical change</p> Signup and view all the answers

    What is the word-equation for the reaction between magnesium and oxygen to form magnesium oxide?

    <p>Magnesium + Oxygen -&gt; Magnesium oxide</p> Signup and view all the answers

    What observations can help determine whether a chemical reaction has taken place?

    <p>Change in state, change in color, evolution of a gas, change in temperature</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 Activity 1.3, what happens when dilute hydrochloric acid or sulphuric acid is added to zinc granules?

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

    What is the most concise and useful way for representing chemical equations?

    <p>Using chemical formulae</p> Signup and view all the answers

    What is the most concise and useful way for representing chemical equations?

    <p>Using symbols and formulas</p> Signup and view all the answers

    What observations can help determine whether a chemical reaction has taken place?

    <p>Change in color, formation of a precipitate, evolution of gas, or change in temperature</p> Signup and view all the answers

    What is the nature of change observed when milk is left at room temperature during summers?

    <p>Chemical change</p> Signup and view all the answers

    In which type of change does food get digested in our body?

    <p>Chemical change</p> Signup and view all the answers

    What kind of change occurs when grapes get fermented?

    <p>Chemical change</p> Signup and view all the answers

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

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

    What is the word-equation for the reaction between lead nitrate solution and potassium iodide solution?

    <p>Lead nitrate solution + Potassium iodide solution → Lead iodide + Potassium nitrate</p> Signup and view all the answers

    What type of change occurs when zinc granules react with dilute hydrochloric acid or sulphuric acid?

    <p>Chemical change</p> Signup and view all the answers

    What is the most concise and useful way for representing chemical equations?

    <p>Using chemical formulae</p> Signup and view all the answers

    What is formed when magnesium ribbon burns in oxygen?

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

    Study Notes

    Chemical Changes and Reactions

    • Milk left at room temperature during summers undergoes decomposition, a type of chemical change.
    • Iron objects exposed to humid atmosphere undergo rusting, a type of chemical change.
    • Grapes fermenting undergo a chemical change, resulting in the production of wine.
    • Cooking food involves a chemical change, as the ingredients are transformed into a new substance.
    • Digestion of food in the body involves a chemical change, where complex molecules are broken down into simpler ones.

    Chemical Reactions

    • The word-equation for the reaction between magnesium and oxygen to form magnesium oxide is: Magnesium + Oxygen → Magnesium Oxide.
    • Observations that can help determine whether a chemical reaction has taken place include:
      • Change in color
      • Evolution of gas
      • Formation of a precipitate
      • Change in temperature
      • Production of a new substance

    Chemical Equations

    • The most concise and useful way for representing chemical equations is through chemical formulas, which use symbols and formulas to represent the reactants and products.

    Reactions and Products

    • When lead nitrate solution is mixed with potassium iodide solution, a yellow precipitate of lead iodide is formed.
    • When dilute hydrochloric acid or sulphuric acid is added to zinc granules, hydrogen gas is produced, and zinc chloride or zinc sulphate is formed.
    • When magnesium ribbon burns in oxygen, magnesium oxide is formed.

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    Description

    Test your understanding of chemical reactions and equations with this quiz. Explore the concepts of reactions in daily life and how substances change under different conditions.

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