Physical and Chemical Changes Quiz

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Questions and Answers

Which of the following is a characteristic feature of physical changes?

  • Accompanied by energy change
  • Change in the chemical composition
  • No change in the identity of the substance (correct)
  • Formation of new substances

When a tree grows taller, what type of change is it considered?

  • Biological change (correct)
  • Physical change
  • Chemical change
  • Mechanical change

Which of the following is a common misconception about chemical changes?

  • The original substance maintains its identity
  • The change is generally temporary
  • The original substance is completely lost (correct)
  • The change is not accompanied by energy change

When a nail rusts, what type of change does it represent?

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

Which process involves a change in the molecular structure of substances?

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

In which of the following scenarios is energy always absorbed or released?

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

Which characteristic feature is typically associated with chemical changes?

<p>The identity of the original substance is completely lost (A)</p> Signup and view all the answers

Which process is an example of a chemical change?

<p>Fermentation of grapes (A)</p> Signup and view all the answers

What drives the formation of chemical bonds?

<p>Attainment of a complete octet configuration (D)</p> Signup and view all the answers

Which type of change best defines a chemical reaction?

<p>A process where new substances with entirely new properties are formed (B)</p> Signup and view all the answers

What precaution should be taken during the reaction between magnesium and oxygen?

<p>Wear eye protection (C)</p> Signup and view all the answers

Why is cleaning the magnesium ribbon with sandpaper necessary before burning it?

<p>To remove impurities (B)</p> Signup and view all the answers

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