Question

Choose the most appropriate answer.

1. Molecules of a solid
2. The force of attraction between two similar types of molecules is called

a) Adhesion (b) Cohesion (c) Electrostatic Force (d) Conduction

3. The temperature at which at which a solid changes into its liquid state is called

a) boiling point (b) freezing point (c) condensation point (d) Melting point

4. How does the kinetic energy of a molecule in a substance change with a decrease

is its temperature.

a) it remains the same. (b) it increase (c) it decreases (d) it becomes twice
5. In convection currents,

a) hot molecules rise up. (b) cold molecules sink down

c) molecules actually move from their place. (d) all of these
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Answer 1

Answer:

The state of a substance depends on the balance between the kinetic energy of the individual particles (molecules or atoms) and the intermolecular forces. The kinetic energy keeps the molecules apart and moving around, and is a function of the temperature of the substance and the intermolecular forces try to draw the particles together.

gases

average kinetic energy of the molecules is larger than average energy of attractions between molecules

lack of strong attractive forces allows gases to expand

liquids

denser than gases

have a definite volume

attractive forces not strong enough to keep molecules from moving allowing liquids to hold shape of container

solids

intermolecular forces hold molecules together and keep them from moving

not very compressible

crystalline – solids with highly ordered structures

Answer 2

Answer:

1)MOLECULES OF A SOLID

1. They are closely packed.
2. Strong intermolecular attraction.
3. Not compressible
4. Molecules have restricted movement
5. Intermolecular space is minimal.

2)The force of COHESION is defined as the force of attraction between molecules of the same substance.

3)The temperature at which a solid changes into its loquid state is called the MELTING POINT.

4)Kinetic energy of a molecule is a function of temperature, hence on decreasing temperature kinetic energy decreases.

5)In covection current :

1. Molecules move from hotter place to a colder region.
2. The hot molecules rise above cooler dense molecules.
3. Cold molecules sink down.

ANSWER-:All of the above...

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