Everything Science Grade 10

3.2 CHAPTER 3. STATES OF MATTER AND THE KINETIC MOLECULAR THEORY

Element Melting point (◦C) Boiling point (◦C)

copper 1083 2567

magnesium 650 1107

oxygen -218,4 -183

carbon 3500 4827

helium -272 -268,6

sulphur 112,8 444,6

a. What state of matter (i.e. solid, liquid or gas) will each of these ele-

ments be in at room temperature ( 25 ◦C)?

b. Which of these elements has the strongest forces between its atoms?

Give a reason for your answer.

c. Which of these elements has the weakest forces between its atoms?

Give a reason for your answer.

5. Complete the following submicroscopic diagrams to show what magne-

sium will look like in the solid, liquid and gas phase.

solid liquid gas

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62 Chemistry: Matter and Materials