Melting and Boiling

At what temperature does pure Ice water melt?

• 100°C (212°F)

• -10°C (14°F)

• 0°C (32°F)

• 50°C (122°F)

What is the boiling point of water under standard atmospheric pressure?

• 0°C (32°F)

• 50°C (122°F)

• 100°C (212°F)

• -100°C (-148°F)

At what temperature does pure water freeze?

• 100°C (212°F)

• 0°C (32°F)

• -5°C (23°F)

• 20°C (68°F)

What scientific principle explains the coexistence of solid and liquid states at 0°C?

• Boyle's Law

  
  

• Equilibrium

  
  

• Conservation of Mass

  
  

• Newton's First Law

  
  

What happens to a substance's melting point when impurities like salt are added?

• It increases.

• It stays the same.

• It lowers.

• It becomes unpredictable.