S4.1.1 Glossary Flashcards
Atom
The smallest part of matter
Boiling
When a liquid becomes a gas when it is heated
Boiling point
The temperature at which a substance boils
Bonding
How atoms are chemically joined together
Change of state
When a substance changes from one state to another
Chemical change
An irreversible change in a substance to form a new product
Condensing
When a gas cools to become a liquid
Density
A measure of a substance’s mass per unit volume
Evaporation
When a liquid is heated to become a gas
Freezing
When a liquid cools to become a solid
Gas
A state of matter with particles which are spread far apart
Gas pressure
A force exerted by gas particles colliding with the walls of a container
Impure
A substance containing more than one element or compound
Kinetic energy
The energy store of moving objects
Kinetic theory
The rapid, constant motion of particles in a gas