Explain each of the following meanings. In your answer include an example to help with your explanation. a. Expansion b. Contraction c. Physical change d. Sublimation e. Diffusion f. Random movement
Answers
Answer:
It's below
Explanation:
a) Expansion, in physics, is the increase in volume resulting from an increase in temperature.
Eg: Thermometers work because the liquid inside them expands and rises up the tube when it gets hotter.
b) Contraction, in physics, is the decrease in volume resulting from a decrease in temperature.
Eg: If we hold a very hot glass tumbler under cold water, it cracks. This is because the outer surface of the glass comes in direct contact with cold water and contracts more as compared to the inner surface.
c) Physical change are changes affecting the form of a chemical substance, but not its chemical composition.
Eg: Changes of state—for example, from solid to liquid or from liquid to gas—are physical changes.
d) Sublimation is the transition of a substance directly from the solid to the gas state, without passing through the liquid state.
Eg: When ice cubes shrink in the freezer.
e) Diffusion is the movement of a substance from an area of high concentration to an area of low concentration.
Eg: Perfume is sprayed in one part of a room, yet soon it diffuses so that you can smell it everywhere.
f) The random movement is movement of microscopic particles suspended in a liquid or gas, caused by collisions between these particles and the molecules of the liquid or gas.
Eg: Microscopic particles suspended in a liquid or gas, caused by collisions between these particles and the molecules of the liquid or gas.
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