Chemical Change vs
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Questions and Answers

Which of the following best describes a chemical reaction?

  • A change in the elemental composition of a substance (correct)
  • A change in appearance, smell, or display of matter without a change in composition
  • A difference in display without changing the composition
  • No reaction is actually occurring

What is the main difference between a physical reaction and a chemical reaction?

  • Physical reactions involve a change in the elemental composition of a substance, while chemical reactions result in a difference in display without changing the composition
  • Physical reactions and chemical reactions are the same thing
  • Physical reactions and chemical reactions both involve a change in appearance, smell, or display of matter without a change in composition
  • Physical reactions result in a difference in display without changing the composition, while chemical reactions involve a change in the elemental composition of a substance (correct)

What is the correct term for physical 'reactions'?

  • Composition changes
  • Chemical changes
  • Elemental changes
  • Physical changes (correct)

What are physical changes limited to?

<p>Changes that involve a change in appearance, smell, or display of matter without a change in composition (C)</p> Signup and view all the answers

What is required for a reaction to take place?

<p>A change in the elemental composition of the substance (B)</p> Signup and view all the answers

Which of the following is NOT a characteristic of a chemical change?

<p>Reversible reaction (C)</p> Signup and view all the answers

What is the term for a reaction that releases heat?

<p>Exothermic reaction (D)</p> Signup and view all the answers

Which branch of science focuses on understanding chemical changes?

<p>Chemistry (D)</p> Signup and view all the answers

What happens to atoms during a chemical reaction?

<p>They are rearranged (B)</p> Signup and view all the answers

Which of the following is an example of a chemical change?

<p>Burning wood (A)</p> Signup and view all the answers

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