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39 Cards in this Set

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Atoms of the same element with different neutron numbers

To do with neutrons

Atomic number

The number of protons in an atom

Mass number

The number of particles, protons and neutrons, in the nucleus


A positively or negatively charged atom or group of atoms

Relative Isotopic Mass

The mass of an atom of an isotope compared with 1/12 of the mass of an atom of Carbon-12

Relative Atomic Mass

The weighted mean mass of an atom of an element compared with 1/12 the mass of an atom of Carbon-12

Relative Molecular Mass

The weighted mean mass of a molecule compared with 1/12 the mass of an atom of Carbon-12

Relative Formula Mass

The weighted mean mass of a formula unit cleared with 1/12 the mass of an atom of Carbon-12

Amount of Substance

The quantity whose unit is a mole

Avogadro Constant

The nuber of atoms per mole of the carbon-12 isotope. (6.02 x 10^23 mol^-1)

A mole

The amount of any substance containing as many particles as there are carbon atoms in exactly 12g of the carbon-12 isotope

Molar Mass, M

The mass per mole of a substance. Units: g mol^-1

Empirical Formula

The simplest whole number ratio of atoms of each element present in a compound

Mole equation

n = m ÷ M. N is Moles, m is mass, M is molar mass

A molecule

A small group of atoms held together by covalent bonds

Molecular formula

The actual number of atoms of each element in a molecule

Molar volume

The volume per mole of a gas. Units: dm^3 mol^-1. At RTP molar volume is 24.0 dm^3 mol^-1

Work out moles of gas

n = V(in dm^3) ÷ 24

Concentration of solution

The amount of solute, in mol, dissolved per 1 dm^3 of solution

Concentration equation

n = c x V (in dm^3)

Standard Solution

A solution of know concentration

A Species

Any type of particle that takes part in a chemical reaction


The molar relationship between the relative quantities of substances taking part in a reaction


A species that is a proton donor


A species that is a proton acceptor

An Alkali

A base that dissolves in water forming aqueous hydroxide ions, OH-

Common Acids


Common Bases

NaOH, Mg(OH)2, MgO, CuO, NH3, CH3NH2

Common Alkalis


A Salt

Any chemical compound that is formed from an acid when a H+ ion from the acid is replaced by a metal ion or another positive ion such as NH4+


Positively charged ion


A negatively charged ion


A crystalline compound containing water molecules


A substance that contains no water molecules

Water of Crystallisation

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

Oxidation Number

A measure of the number of electrons that an atom uses to bond with atoms of another element


Loss of electrons; increase in oxidation number


Gain of electrons; decrease in oxidation number

Redox Reaction

Reaction in which both reduction and oxidation take place. OILRIG