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12 Cards in this Set
- Front
- Back
Melting |
When a solid is heated , its internal kinetic energy increases and the particles vibrate mor vigorously about their mean position. this weakens the force of attraction between them and eventually the molecules can slide about. |
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Solidification |
The opposite of melting, in this when a liquid is cooled, the average kinetic engergy and the speed of molecules in the cooled, melted substance decreases. |
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Boiling |
If after melting, more heat is supplied, the atoms or molecules gain more kinetic energy. they move with greater velocity and the proportion of these escaping from the surface increases (Vapour pressure increases) Eventually, at a temperature known as the boiling point, the atoms have enough energy to escape from the liquid. in the gaseous state, they move about independently. |
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Evaporation |
The phenomena of conversion of a liquid to the vapour state. |
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Condensation |
The phenomena observed when gas is cooled and vapour turns to liquid. |
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Force |
Force is a push or pull that can start or stop the motion of a body, change the direction or velocity of a moving body or change the shape of a body. |
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Friction |
Is the force between surfaces which provides a grip that holds the bodies close together. |
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Cohesion |
It is the combined effect of the forces of attraction between like particles close to each other in the same substance. |
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Adhesion |
It is the combined effect of the forces of attraction between the particles in different substances close to each other. |
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Capillary Action. |
It is the effect that causes liquids to rise or fall in fine tubes. the finer the tube, the higher the liquid will rise up the tube. i.e Menisucs of water in glass, the movement of water through xylem tubes in a tree. |
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Surface Tension |
It is the force (cohesion) at the surface of liquids that keeps drops of liquid together. Detergents and liquid temperature affect this. i.e the rounded shape of a water droplet. |
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Meniscus |
Is the curved surface of a liquid suchs as water in a glass or mercury in a thermometer. it is caused by the adhesive attraction between the liquid and its container. |