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Chapter 5 Matter, Formative question 5.2, Three states of matter, Matter…
Chapter 5 Matter
Kinetic theory of matter
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When heat is supplied, the particle will move faster.
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Temperature remains constant during freezing, melting and boiling
The temperature of the material does not change during the melting, boiling and freezing processes even though energy is transferred. This happens because the kinetic energy of the particles does not increase
During the melting and boiling processes, the heat is absorbed to overcome the force of attraction between particles.
During the freezing process, heat is released to ensure the forces of attraction between particles are formed.
Diffusion
A process in which the particles of substance diffuse from a high concentration area to a low concentration area.
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- Smell of cooking spread all over the house through diffusion of the food particles into the air particles.
- matter is made up of constantly moving small and discrete particles.
- Temperature doesn't change because heat is used to overcome the force attraction between particles and thus, no change in temperature.
- The surface of the lake or river freezes because the water at the very top of the lake is in direct contact with the cold air, so it freezes first. And because ice is less dense than water, the sheet of ice doesn't sink