(Physical) Module 2 - Foundations in Chemistry 2/2

Chapter 2 - Atoms, Ions and Compounds Chapter 3 - Amount of Substance Chapter 4 - Acids and Redox Chapter 5 - Electrons and Bonding Chapter 6 - Shapes of Molecules and Intermolecular Forces

Relative atomic mass (Ar)

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

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 isotopic abundance

The relative amount of each isotope present in a sample of an element

Molecular formula

A formula that shows the number and type of atoms of each element present in a molecule

Empirical formula

The formula that shows the simplest whole-number ratio of atoms of each element present in a compound

Avogadro's constant

The number of molecules in 1 mole of a substance

Weighted mean mass

The mean mass taking into account the relative abundancies of the isotopes

Oxidation number/state

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

Salt

An ionic compound containing the anion of an acid and cation of a base from a neutralisation reaction

Alkali

Water soluble base that releases OH- ions in aqueous solutions

Acid

A substance that releases H+ ions in aqueous solutions

Base

Compounds that can neutralise an acid

Weak Acid

An acid that only partially dissociates in aqueous solutions

Strong Acid

An acid that fully dissociates in aqueous solutions

Neutralisation

A chemical reaction in which acid + base -\> salt + water & sometimes CO2