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What are the three main states of matter?
solids, liquids, gases
Which state of matter has a fixed shape and volume?
solid.
Which state of matter flows and has a fixed volume but no fixed shape?
liquid.
Which state of matter has neither fixed shape nor fixed volume?
gas.
How are the particles arranged in a solid?
closely packed in a regular pattern.
How do particles move in a gas?
they move rapidly and randomly.
What happens to particle movement when a solid melts?
particles gain energy and move more freely.
What is the process of a liquid changing into a gas called?
boiling or evaporation.
What is the process of a gas changing to a liquid called?
condensation.
What is the process of a liquid turning into a solid called?
freezing.
What happens to particle energy when a substance is heated?
it increases.
What happens to the volume of a gas when temperature increases (at constant pressure)?
it increases.
What happens to the volume of a gas when pressure increases (at constant temperature)?
it decreases.
What does the kinetic particle theory explain?
how particles move and behave.
What does a heating curve show?
how temperature changes with time during heating.
What is diffusion?
the spreading out of particles from high to low concentration.
