Question

When a substance such as ice melts, its temperature increases. Describe what happens to the arrangement of the water molecules as the temperature increases.

A) Water molecules separate into hydrogen and oxygen atoms.
B) Water molecules become less orderly and they spread apart.
C) The kinetic energy of the water molecules decreases proportionally to the temperature change.
D) Water molecules lose all contact with one another and intermolecular forces are non-existent.
Elim

Answer 1

B) Ice molecules are more tightly packed because it's a solid. Liquid is less packed than a solid, but a gas is less packed than a liquid.

Answer 2

Answer: B) Water molecules become less orderly and they spread apart.

Explanation:

Solid state: The sate in which the inter molecular forces are strongest and thus particles are highly ordered

Liquid state: The state in which the inter molecular forces are weaker than solids and thus particles are not very highly ordered.

When ice in solid form melts, it changes to liquid state and is a physical change. The molecules become less ordered on moving from solid to liquid state.

A) Water molecules separate into hydrogen and oxygen atoms: This is a chemical change.

C) The kinetic energy of the water molecules decreases proportionally to the temperature change: When ice melts the kinetic energy pf the molecules increase.

D) Water molecules lose all contact with one another and inter molecular forces are non-existent: In liquid state, the inter molecular forces are existent.