Empirical Tuition

Explore atmospheric gases: air is 78% nitrogen, 21% oxygen, and contains trace gases like argon and carbon dioxide. Combustion and decomposition reactions show oxygen’s role in forming oxides. Carbon dioxide, a greenhouse gas, contributes to climate change by trapping heat in the atmosphere.

Explore Group 7 halogens: fluorine, chlorine, bromine and iodine, which decrease in reactivity down the group. They vary in state and color and participate in displacement reactions, where a more reactive halogen displaces a less reactive one from a compound.

Discover the alkali metals in Group 1, which react vigorously with water to form alkaline solutions. These soft, low-density metals become more reactive down the group due to weaker attraction between their outer electron and the nucleus.

Explore electrolysis, breaking down ionic substances using electricity. Ionic compounds conduct when molten or dissolved, allowing cations to gain electrons at the cathode and anions to lose electrons at the anode.

Understand that metallic bonding involves metals forming lattices of positive ions surrounded by delocalized electrons, explaining their conductivity, malleability, and ductility due to free electrons and sliding ion layers.

Learn that covalent bonding involves non-metals sharing electrons. Simple molecules have low melting points, while giant covalent structures like diamond and graphite have high melting points. Most don’t conduct electricity.

Understand that ionic bonding involves electron transfer, forming cations and anions. Strong electrostatic forces create stable lattice structures with high melting points, conducting electricity when molten or dissolved but not when solid.

Learn about concentrations and volumes in chemistry, focusing on solute, solvent, and solution calculations. Measure concentration in moles per dm³ and grams per dm³, and use formula triangles for moles, volume, and concentration.

Learn advanced chemistry calculations, including reacting masses, percentage yield, and empirical formulas. Calculate product masses from balanced equations, compare theoretical and actual yields, and find empirical formulas through experiments. Understand the relationship between empirical and molecular formulas, and explore water of crystallisation for determining hydration in salts.

Learn the essentials of chemical formulae and calculations: writing balanced equations, calculating relative atomic (Ar) and molecular mass (Mr), and understanding moles. Explore the law of conservation of mass, balance equations, and use state symbols.