Science EOU-States of Matter

These flashcards are designed to help students review key concepts regarding the states of matter, phase changes, and their implications.

Phase changes occur when matter transitions between __, __, and __ due to temperature or pressure changes.

solid, liquid, gas

Melting (solid → liquid) and freezing (liquid → solid) occur at the same temperature, known as the __.

melting/freezing point

Evaporation happens at all temperatures, but __ occurs at the boiling point.

boiling

Condensation (gas → liquid) releases heat, forming __ or dew.

clouds

A pure substance has a fixed boiling and freezing point, e.g., pure water boils at __°C and freezes at __°C.

100, 0

Impurities can alter freezing and boiling points; they lower freezing points and __ boiling points.

raise

Physical changes involve a change in state, size, or shape but no new substances are __.

formed

Kinetic Molecular Theory explains that particles in solids are __ packed and vibrate in fixed positions.

tightly

In gases, particles have the most energy, move rapidly, and __ to fill their container.

expand

The application of phase changes in the environment includes melting glaciers due to __.

global warming