The oxygen that we breathe is a molecule made of two oxygen atoms.
Molecules are particles that have more than _____ atoms joined together.
An atom is the _____ unit of an element.
Electrons are much smaller than protons and neutrons. They have about _____ times less mass.
a particle with one unit of positive charge
Mass is measured in pounds.
Materials such as glass, rubber, and plastic are all called _____.
this measures how much space matter takes up
a resistance to sinking
amount of matter in an object
What is needed in order to change the state of matter?
When it rains, _____ happens as gas changes to liquid and falls to the ground.
Oxygen molecules are usually found as a gas, but at very low temperatures, they can become a(n) _____.
Most bridges and buildings have _____ joints to allow the object’s volume to change with heat.
process that changes a gas into a liquid
Sulfuric acid and nitric acid are both commonly used acids.
Elements in the far-left columns of the periodic table are alkali metals.
One chemical property of a substance is its _______, or whether or not it can catch fire.
a way a substance reacts with another substance
the process of a liquid changing into a gas
a smaller particle with one unit of negative electric charge
smallest unit of an element
the temperature at which something boils
a particle with no electrical charge
decrease in volume due to change in heat
