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Module 2: Foundations in chemistry (2.1.4 Acids)

6 dot points across 6 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.

How do acids, bases and salts behave, and how do we prepare and standardise solutions?

Acids as proton donors, strong and weak acids, bases, alkalis and neutralisation, the reactions of acids with metals, carbonates and bases, salt preparation, and the techniques of standard solutions and acid-base titration.
An OCR H432 module 2 answer covering acids as proton donors, strong and weak acids, bases and alkalis, neutralisation reactions, salt preparation, standard solutions, and acid-base titration technique.
9 min answer →

How does the mole let us count particles and predict the masses, volumes and concentrations in a reaction?

The Avogadro constant and the mole, molar mass, the ideal gas equation, empirical and molecular formulae, concentration and titration calculations, and percentage yield and atom economy.
An OCR H432 module 2 answer covering the Avogadro constant, molar mass, the ideal gas equation, empirical and molecular formulae, concentration, titrations, percentage yield and atom economy.
11 min answer →

How does the arrangement of sub-atomic particles and isotopes explain atomic mass and chemical identity?

Sub-atomic particles and their relative masses and charges, atomic number and mass number, isotopes and their identical chemical properties, and the determination of relative atomic mass from mass spectra.
An OCR H432 module 2 answer covering protons, neutrons and electrons, atomic and mass number, isotopes, and calculating relative atomic and isotopic mass from mass spectrometry data.
9 min answer →

How do we represent chemical species and reactions with formulae and balanced equations?

Names and formulae of common ions, binary and polyatomic compounds, the use of oxidation numbers in naming, and the construction of balanced full and ionic equations including state symbols.
An OCR H432 module 2 answer covering common ion formulae, naming with oxidation numbers, writing chemical formulae from charges, and constructing balanced full and ionic equations with state symbols.
9 min answer →

How does electron configuration explain bonding, molecular shape and the properties of materials?

Electron configuration in shells, sub-shells and orbitals, ionic, covalent (including dative) and metallic bonding, electronegativity and bond polarity, electron-pair repulsion and molecular shapes, and the properties of the four crystal structures.
An OCR H432 module 2 answer covering electron configuration in sub-shells and orbitals, ionic, covalent, dative and metallic bonding, electronegativity and polarity, electron-pair repulsion shapes, and crystal structures.
11 min answer →

How do oxidation numbers let us track electron transfer in chemical reactions?

Oxidation numbers and the rules for assigning them, oxidation and reduction as loss and gain of electrons, oxidising and reducing agents, and the construction of half-equations and overall redox equations.
An OCR H432 module 2 answer covering oxidation number rules, oxidation and reduction as electron transfer, oxidising and reducing agents, and building half-equations and balanced redox equations.
9 min answer →