33) Which of the following processes involves the adding of energy (heat)? A) co

Question

33) Which of the following processes involves the adding of energy (heat)?

A) condensation B) melting C) freezing

34) The temperature at which a liquid boils is the boiling point of the liquid. The boiling point is an indication of the intermolecular forces that hold the matter in the liquid state. Water, H2O, boils at 100°C. propanol, C3H8O boils at 86°C. Ammonia, NH3, boils at -33°C. Which one of the following ranks the intermolecular forces in these liquids from the strongest to the weakest?

A) Water > Ammonia > propanol

B) Ammonia > propanol > Water

C) propanol > Water > Ammonia

D) Water > propanol > Ammonia

Explanation / Answer

33) Which of the following processes involves the adding of energy (heat)?

A) condensation B) melting C) freezing

Condensation: this process releases energy (heat).

Melting: this process absorbs energy (heat).

Freezing: this process releases energy (heat).

Thus the correct answer is B) melting.

34) The temperature at which a liquid boils is the boiling point of the liquid. The boiling point is an indication of the intermolecular forces that hold the matter in the liquid state. Water, H2O, boils at 100°C. propanol, C3H8O boils at 86°C. Ammonia, NH3, boils at -33°C. Which one of the following ranks the intermolecular forces in these liquids from the strongest to the weakest?

A) Water > Ammonia > propanol

B) Ammonia > propanol > Water

C) propanol > Water > Ammonia

D) Water > propanol > Ammonia

The compound, which has stronger intermolecular forces, means higher boiling point. Here water has higher boiling point and the ammonia has lower boiling point. Thus the order of intermolecular forces in these liquids from the strongest to the weakest is

D) Water > propanol > Ammonia

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