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