Defintions For Module 2

Neuter of protons in the nucleus

Charged atom or molecule

Atom of the same element with he same number of protons and electrons but different number of neutrons

Total number of protons and neutrons

Instrument which gives accurate information about relative isotopic mass and relative abundance of isotopes

Weighted mean mass of an atom of an element when compared to 1/12th mass of an atom of carbon 12

Mass of an atom of an isotope when compared to 1/12th mass of an atom of carbon12

Mass of the formula unit of a compound with a giant structure

Compound which is made up of oppositely charged ions that are held together by electrostatic forces of attraction

Crystalline compound containing no water

Measure of amount of starting material,s that end up as useful products

Mr of desired product ———————————. X100 Sum of Mr of all reactants

Number of particles per mole of substance 6.02 x10^23

Simplest whole number ratio f atoms of each element present in a compound

Crystalline compound that’s contains water

pV = nRT

Volume of 1mole of gas in dm^3 mol^-1

Mass per mole of substance in g mol^-1

Amount of a substance containing as many particles as there are carbon atoms in exactly 12g of carbon12 isotope

Percentage ratio of actual yield of a product from a reaction compared to theoretical yield

Actual yield ———————— x100 Theoretical yield

Average mass of one molecule of an element or compound compared to 1/12 mass of an atom of carbon 12

Water molecules that form part of the crystalline structure of a compound

(m/z X %) + (m/z X %) —————————— 100