Chemistry Unit 1

Isotopes

Ion

Relative atomic mass

Mole

Molar mass

Empirical formula

Molar volume

Stoichiometry

Acid and Base

Same no. of protons and electrons, but diff. no. of neutrons

Postively or negatively charged atom/group

Weighted mean mass of an atom compared to the mass of 1/12th of carbon-12

Amount of substance containing the same number of atoms as 12g of carbon-12

Mass per mol of substance

Simplest whole number ratio of atoms present in a compound

Volumer per mole of gas (24dm-3)

Molar relationship between relative quantities of a substance in a reaction

Acid = proton donor                         Base = proton reciever

Trigonal planar = 120 degrees

Tetrahedral         = 109.5 degrees

Octahedral        = 90 degrees

Pyramidal       = 107 degrees

Non-linear / Bent     = 104.5 degrees

Linear           = 180 degrees