Understanding Phase Changes: Evaporation and Boiling

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Questions and Answers

What is the main difference between evaporation and boiling?

  • Evaporation occurs at the surface, while boiling occurs throughout the liquid. (correct)
  • Evaporation causes the liquid to cool down, while boiling causes the liquid to heat up.
  • Evaporation requires less energy than boiling.
  • Evaporation only occurs at high temperatures, while boiling can occur at any temperature.

Why does the drop of rubbing alcohol evaporate faster on your hand than on the table?

  • Your hand provides more energy to the alcohol, causing it to evaporate faster. (correct)
  • The table is made of a material that slows down the evaporation process.
  • The table is colder than your hand, causing the alcohol to evaporate more slowly.
  • The table is warmer than your hand, causing the alcohol to evaporate more quickly.

At what temperature does evaporation occur?

  • Evaporation only occurs at the boiling point of a liquid.
  • Evaporation occurs at a specific temperature that is unique to each liquid.
  • Evaporation occurs at any temperature, as long as the liquid is in contact with air. (correct)
  • Evaporation only occurs at temperatures above the freezing point of the liquid.

What happens to the temperature of a liquid during boiling?

<p>The temperature of the liquid increases until it reaches the boiling point, then remains constant. (C)</p> Signup and view all the answers

What is the boiling point of a substance?

<p>The boiling point is the temperature at which the liquid phase of a substance changes to the gaseous phase. (B)</p> Signup and view all the answers

What is the primary driving force behind evaporation?

<p>Molecules at the surface gaining enough energy to enter the gaseous state (B)</p> Signup and view all the answers

What happens during the boiling process?

<p>Molecules throughout the liquid enter the gaseous state (B)</p> Signup and view all the answers

Which statement about the boiling point is true?

<p>It is the temperature at which a liquid changes to a gas (D)</p> Signup and view all the answers

What happens to the temperature of a liquid during boiling?

<p>It remains constant (A)</p> Signup and view all the answers

Which factor affects the rate of evaporation?

<p>The temperature (C)</p> Signup and view all the answers

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