Chemical and Physical Changes Quiz

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Questions and Answers

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

  • It remains unchanged
  • It undergoes a chemical change due to the action of microorganisms (correct)
  • It evaporates completely
  • It curdles due to the action of enzymes

What happens when grapes get fermented?

  • They become sour
  • They remain unchanged
  • They undergo a chemical change due to the action of microorganisms (correct)
  • They become juicier

What do we observe when food is cooked?

  • The food loses water content
  • The food becomes colder
  • A chemical change occurs due to the application of heat (correct)
  • No change occurs

What do we come to know when a chemical reaction has taken place?

<p>A change in the nature and identity of the initial substance occurs (B)</p>
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What is meant by a chemical reaction?

<p>A process where one or more substances are converted into different substances with different properties (D)</p>
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What is the purpose of burning a magnesium ribbon in the activity described in the text?

<p>The purpose is to observe the chemical reaction that occurs when magnesium burns in air to form magnesium oxide.</p>
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What precautionary measures are recommended for the activity involving burning a magnesium ribbon?

<p>The activity requires the teacher's assistance and students are advised to wear suitable eyeglasses. Additionally, the magnesium ribbon should be burned away from the eyes.</p>
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What is the primary change observed when food is cooked?

<p>The primary change observed when food is cooked is a chemical change, as the nature and identity of the initial substances have somewhat changed.</p>
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How can we determine if a chemical reaction has taken place?

<p>A chemical reaction is indicated by the occurrence of a chemical change in which the nature and identity of the initial substances have changed.</p>
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When does a chemical reaction occur?

<p>A chemical reaction occurs when a chemical change takes place, resulting in a change in the nature and identity of the initial substances.</p>
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