Define compound, molecule, chemical formula, diatomic molecule
Write and decipher a chemical formula
Atoms combine together to form most of the substances we observe in the world around us.
Compounds - two or more atoms chemically joined together to form a new substance with very different properties than the elements of which it is formed.
Sodium + Chlorine = Salt
The smallest piece of a compound is that still has all of the properties of the compound.
The subscripts to the right of the letters tell you HOW MANY ATOMS of each element. If there isn’t one, it means that there is one atom of that element.
H 2 O
If there is a number in front of the formula, it tells you how many MOLECULES of that substance:
4H 2 O
This number is called the coefficient.
C 6 H 12 O 6
Ba(NO 3 ) 2
2Al 2 (SO 4 ) 3
diatomic molecule When an element consists of two identical atoms it is called DIATOMIC molecule. O 2 7 elements are always found as diatomic molecules - I odine, H ydrogen, N itrogen, B romine, O xygen, C hlorine, F luorine I H ave N o Br ight O r Cl ever F riends