Quiz on Hydrates

What is a hydrate?

• A compound without water

• A compound that contains water molecules in its structure

• A gas at room temperature

• A liquid that does not mix with water

Which of the following is an example of a hydrate?

• NaCl

• CuSO₄·5H₂O

• H₂O

• CO₂

What is the general formula for a hydrate?

• Compound·nH₂O

• Compound + H₂O

• Compound - H₂O

• Compound x H₂O

What happens to a hydrate when it is heated?

• It gains water

• It loses water of hydration

• It melts

• It becomes a gas

What term describes the water molecules that are part of a hydrate?

• Hydrophobic

• Water of crystallization

• Solvent

• Moisture

Which hydrate is known as "blue vitriol"?

• CaSO₄·2H₂O

• CuSO₄·5H₂O

• MgSO₄·7H₂O

• FeCl₃·6H₂O

What color change occurs when anhydrous copper(II) sulfate is hydrated?

• White to blue

• Blue to white

• Green to blue

• Yellow to red

Which statement is true about hydrates?

• They cannot lose their water content.

• They are always gases.

• They can exist as solids at room temperature.

• They do not form crystals.

How can you determine the number of water molecules in a hydrate experimentally?

• By visual observation

• By measuring mass before and after heating

• By using a thermometer

• By dissolving it in water

What is the term for a compound that can absorb water from the air?

• Anhydrous

• Hygroscopic

• Deliquescent

• Efflorescent