States of Matter Changes Flashcards

Grade 3 · Science · Flashcards

Review the vocabulary for the three states of matter and the processes by which matter changes from one state to another.

Flashcards

Matter: Anything that has mass and takes up space; everything around us is made of matter.
Solid: A state of matter with a definite shape and definite volume; particles are tightly packed together.
Liquid: A state of matter with a definite volume but no fixed shape; it flows and takes the shape of its container.
Gas: A state of matter with no definite shape or volume; particles move freely and spread out.
Melting: The change of state from solid to liquid caused by adding heat. Example: ice melting into water.
Freezing: The change of state from liquid to solid caused by removing heat. Example: water freezing into ice.
Evaporation: The change of state from liquid to gas caused by adding heat. Example: a puddle drying up.
Condensation: The change of state from gas to liquid caused by removing heat. Example: dew forming on grass.
Sublimation: The change of state directly from solid to gas, skipping the liquid stage. Example: dry ice.
Melting point: The temperature at which a solid changes to a liquid. Water's melting point is 0 degrees Celsius.
Boiling point: The temperature at which a liquid rapidly evaporates into gas. Water's boiling point is 100 degrees Celsius.
Physical change: A change in the form or appearance of matter that does not change what the substance is made of.
Heat energy: A form of energy that causes particles to move faster; adding heat can cause matter to change state.