Science Test Flashcards
What is an atom
Smallest unit of matter
What are elements?
Cannot be broken down by chemical means
What is matter
Physical substance that has mass and occcupies : space
What are molecules
2 or more same atoms held together by a chemical bond
What are compounds
2 or more different atoms held together by a chemical bond
Two capital letter
Compounds
One capital letter and no numbers
Elements
One capital letter and one number
Molecules
What is a solid
Molecules that are packed together (fixed volume)
What is a liquid
Molecules that are less packed together than solids (fixed volume)
What is gas
Molecules that are spread out ( not fixed volume
Melting
Solid to a liquid
Freezing
Liquid to a solid
Vaporization
Liquid to a gas
Evaporation
Liquid to a gas on the surface of a liquid