1.1 Chemical Calculations

Formula mass vs formula unit

formula unit is the chemical entity itself (the ionic representation, ex. NaCl), while formula mass is the calculated weight of that entity (it’s molecular mass)

Angstroms

10^-10 m

Limitation of molecular formula

doesn’t tell atomic arrangement

Element

substance cant be broken down to simpler substances

Compound

made up of two or more elements

Metals properties

Luster, can be shaped, good conductors, malleable, ductile

Non metals properties

poor conductors, non-malleable, non-ductile, lack luster

Diatomic molecules

H2, N2, O2, F2, Cl2, Br2, I2

Atomic mass

ratio of mass of a given atom to the mass of carbon 12

Binary compounds nomenclature

non-metal “ide”

for ionic molecules the more electronegative is “ide”

Molecular mass

sum of the atomic masses of atoms in a molecule

kilo

10³

centi

10^-2

milli

10^-3

micro

10^-6

nano

10^-9