Question

Which of the following examples shows an increase of energy in the particles of matter? (Select/Choose THREE that are true)

A. solid to liquid

B. liquid to gas

C. solid to gas

D. liquid to solid

E. gas to liquid

Answer 1

Answer:

Options A, B, and C

Explanation:

Increase of energy particles mean acceleration in particles. Solid to liquid when the particles are barely moving in solids then when it turns into a liquid the particles speed up. Liquid to gas liquids particles are moving but not fast but then when it goes to gas the particles speed up faster. Solid to gas particles are barely moving then when it turns into a gas particles move faster.

Hope this helps.

Answer 2

Answer: Options (A), (B) and (C) are correct.

Explanation:

In a solid, molecules are held together by strong intermolecular forces of attraction. As a result, they are unable to move from their initial place but they can vibrate at their mean position.  

Hence, in solid substances the molecules have low kinetic energy.

Whereas in liquids, the molecules are held by less strong intermolecular forces of attraction as compared to solids. Due to which they are able to slide past each other. Hence, they have medium kinetic energy.

In gases, the molecules are held by weak Vander waal forces. Hence, they have high kinetic energy due to which they move rapidly from one place to another leading to more number of collisions.  

Hence, gases are able to expand more rapidly as compared to liquids.

Therefore, we can conclude that following examples shows an increase of energy in the particles of matter:

• solid to liquid

• liquid to gas

• solid to gas