Changes of State Flashcards

All 6 cards in this deck

What are the names of the changes of state from solid to liquid and from liquid to solid?

Solid to liquid is melting; liquid to solid is freezing.

What are the names of the changes of state from liquid to gas and from gas to liquid?

Liquid to gas is boiling (or evaporating); gas to liquid is condensing.

What is sublimation?

A substance changing directly from a solid to a gas, without becoming a liquid.

What happens to the mass of a substance when it changes state?

The mass is conserved (stays the same) — no particles are created or destroyed.

Why is a change of state a physical change and not a chemical change?

No new substance is made — the material recovers its original properties if the change is reversed.

True or false? When water in a sealed container boils to form steam, the total mass decreases.

False. Mass is conserved in a change of state, so the total mass is unchanged.