last physics test Flashcards
solid
cannot be squished, rigid, fixed shape
liquid
can not be squished, not rigid, not fixed shape
gas
can be squished, not rigid, not fixed shape
substance definition
A substance is anything that contains matter
Mixture
Any group of substances that are combined without a chemical reaction occuring
Pure substance
A single substance, either an element or a substance that has been formed by a chemical reaction (a compound)
Elements
an element is a type of atom, classified according to the number of protons it has (known as the atomic number). The elements are arranged on the periodic table according to the atomic number it has. . An element can be a single atom or a group of atoms that are all the same type.
how many elements do we know of
118
Aluminum
Al
Calcium
Ca
Carbon
C
Chlorine
Cl
Copper
Cu
Gold
Au
Helium
He