Melting and Boiling Points for SQA National 5 Chemistry

Melting and Boiling Points

This page covers the following topics:

1. Melting points
2. Boiling points

The melting point of a substance is the temperature at which it changes state from solid to liquid

Melting points

The boiling point of a substance is the temperature at which a liquid boils and turns to vapour.

Boiling points

1

Melting points are useful when identifying between members of a homologous series. What is a homologous series?

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A family of hydrocarbons with similar chemical properties who share the same general formula.

Melting points are useful when identifying between members of a homologous series. What is a homologous series?

2

Which of the products shown are gases at 1000 degrees C?

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Cadmium, ice/water, iodine

Which of the products shown are gases at 1000 degrees C?

3

If we decrease the pressure, what effect does this have on the boiling point of a substance?

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It decreases

If we decrease the pressure, what effect does this have on the boiling point of a substance?

4

A solid material is heated in a furnace and it is found that it melts at 1055 ºC. Use the table to state what the material is.

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actinium

A solid material is heated in a furnace and it is found that it melts at 1055 ºC. Use the table to state what the material is.

5

What is the name for rocks underground getting so hot that they become a liquid? Hint: this liquid is found at volcanoes.

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Magma

What is the name for rocks underground getting so hot that they become a liquid? Hint: this liquid is found at volcanoes.

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