Question

which statement about matter is correct?○ in matter, molecules never stop moving.○ in the solid state, molecules stop moving.○ pressure and temperature do not affect matter.○ liquids have a lower level of energy than solids.

Explanation:

• Molecules in all states of matter have thermal energy and never cease motion; even in solids, they vibrate in place.
• Solid-state molecules vibrate, so they do not stop moving.
• Pressure and temperature directly affect the state and properties of matter (e.g., phase changes).
• Liquids have higher molecular energy than solids, as their molecules move more freely.

Answer:

A. In matter, molecules never stop moving.