To investigate changes of state
Science - Particles
Miss Pollock
The melting point of potassium is 63.5 °C and its boiling point is 758.8 °C. Plot this on the graph on the next slide. You can use the template of the graph to help you, (this is optional). You must identify the following:
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The melting point of potassium is 63.5 °C and its boiling point is 758.8 °C. Plot this on the graph
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Temperature °C
Time
800°C
400°C
0°C
Using the particle model explain why the the melting point of potassium is 63.5°C and its boiling point is 758.8°C.
The melting point of potassium is _____ °C because this is the temperature when it changes from a ______ to a liquid. When it is a solid, the particles are ____ together and the particles are ____ attracted to each other, however, when it reaches its boiling point, the particles are far away from each other as they ____ attraction. At its boiling point, it changes state from liquid to ____ as the particles ……
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Worksheet Answers
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Temperature °C
SOLID
LIQUID
GAS
Time
800°C
400°C
0°C
Boiling point
Melting point
Heating curve for potassium
Using the particle model explain why the melting point of potassium is 63.5 °C and its boiling point is 758.8 °C.
The melting point of potassium is 63.5 °C because this is the temperature where it changes from a solid to a liquid. When it is a solid, the particles are close together and the particles are highly attracted to each other; however, when it reaches its melting point, the particles are far away from each other as they lose attraction. At its boiling point, it changes state from liquid to gas as the particles lose more attraction and become spread apart even further from each other.
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