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CHE 105/110 Introduction to Chemistry - Exercises and Answers

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QUESTION ANSWER

1.

All other things being equal, rank the intermolecular forces in order of increasing strength.

1.

dispersion forces < dipole-dipole interactions < hydrogen bonding < ionic bonding

3.

Can a molecule experience more than one intermolecular force at the same time? Why or why not?

3.

Yes, but one intermolecular force usually dominates.

5.

How many grams of solid water can be melted with 1.55 kJ of energy?

5.

4.64 g

7.

Another way to minimize freezer burn is to wrap food tightly before freezing. Why would this minimize freezer burn?

7.

Water in the vapor phase has no space to evaporate into.

9.

Which do you think would have a higher surface tension—liquid neon or liquid krypton? Explain your answer.

9.

liquid krypton because it would have stronger dispersion forces

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