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End Of Chapter Exercises

Exercise 3.1See solutions

Give one word or term for each of the following descriptions.

  1. The change in phase from a solid to a gas.

  2. The change in phase from liquid to gas.

Water has a boiling point of 100℃

  1. Define boiling point.

  2. What change in phase takes place when a liquid reaches its boiling point?

Describe a solid in terms of the kinetic molecular theory.

Refer to the table below which gives the melting and boiling points of a number of elements and then answer the questions that follow. (Data from http://www.chemicalelements.com)

Element

Melting point (℃)

Boiling point (℃)

copper

magnesium

oxygen

carbon

helium

sulphur

  1. What state of matter (i.e. solid, liquid or gas) will each of these elements be in at room temperature (25℃)?

  2. Which of these elements has the strongest forces between its atoms? Give a reason for your answer.

  3. Which of these elements has the weakest forces between its atoms? Give a reason for your answer.

Complete the following submicroscopic diagrams to show what magnesium will look like in the solid, liquid and gas phase.

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See solutions