Vocabulary
What is a density?
how spread out the particles are
What are the 3 phases of matter?
Liquid, solid, gas
What is melting?
When a solid turns into a liquid
Atoms bond together to form this
Molecule
The particles in a solid have ___ energy than particles in a liquid
Less
What is evaporation?
when a liquid turns into a gas.
What phase of matter is it called when molecules stay in place?
A solid
What is evaporation?
the process of turning from liquid into vapor
This suffix means "the study of"
"-ology"
Which state of matter has particles that vibrate in a fixed position?
Solid
What is a molecule?
a group of atoms combined together in a particular way
A substance in this phase will never have the same shape or volume
Gas
Name 3 gases
hydrogen, oxygen, water vapor
(or others)
This can also force a substance to change state
Pressure
What are we measuring when we see how heavy a substance is?
mass
What is kinetic energy?
the energy an object has because of its motion
A substance in this phase takes the shape of it's container but always takes up the same amount of space
Liquid
What is the melting point of ice?
0oC
As a substance changes from a solid to a liquid to a gas, the amount of thermal energy ______.
Increases
The particles in an object have some attraction between each other and move by sliding around each other. The particles belong to a __________.
Liquid
What is intermolecular force?
When forces acting between two molecules depend on the distance between the molecules and the distance is measured from their centers.
Why do solids keep their shape?
The particles are linked by strong forces which connect them tightly
What is the boiling point of water?
100oC
What happens to the particles when thermal energy is decreased?
They slow down.
The intermolecular forces decrease.
What tool do we use to measure temperature?
thermometer