IB3 min read
Why IB Chemistry Reactivity 3.3 separates a 5 from a 7
IB Chemistry Reactivity 3.3 electron sharing reactions: curly-arrow rules, HL mechanism drawing, SL pattern recognition, and rubric criteria that decide a 5 from a 7.
Read postCategory
IB posts
Browse all of our blog posts in the IB category here.
IB3 min read
How to balance a half-equation in acid for IB Chemistry
IB Chemistry Reactivity 3.2 electron transfer reactions: how examiners mark oxidation numbers, half-equations, and redox titrations on Papers 1 and 2.
Read postIB3 min read
How to score a 7 on IB Chemistry Reactivity 3.1 weak-acid
IB Chemistry Reactivity 3.1 proton transfer reactions: Brønsted–Lowry, Lewis, Ka, pH curves, and the conjugate-pair writing that decides a 6 from a 7.
Read postIB3 min read
IB Chemistry Reactivity 2.3: why 'how far' is a number, not a feeling
IB Chemistry Reactivity 2.3 explained: Kc, Kp, Le Chatelier, ICE tables and the Paper 1/Paper 2 split that decides a 5 from a 7 in the IB Diploma.
Read postIB3 min read
IB Chemistry Reactivity 2.2
IB Chemistry Reactivity 2.2 breaks down the rate of reaction into collision theory, the rate expression, and Arrhenius behaviour.
Read postIB3 min read
Why a 7 in IB Chemistry Reactivity 1.4 depends on conditions
IB Chemistry Reactivity 1.4 entropy and spontaneity: Gibbs-energy traps, sign conventions, and Paper 1 / Paper 2 question types that decide a 6 from a 7.
Read postIB3 min read
5 mole–stoichiometry traps in IB Chemistry Reactivity 2.1
IB Chemistry Reactivity 2.1 – How much? Stoichiometry mastery for Paper 1 and Paper 2, with worked mole ratio, limiting reagent, and gas volume methods.
Read postIB3 min read
How to draw an enthalpy-level diagram for IB Chemistry Reactivity 1.2
IB Chemistry Reactivity 1.2 energy cycles explained: Hess's law, enthalpy of formation, and bond enthalpies, with the Paper 2 marking patterns that decide a 5 from a 7.
Read postIB3 min read
Why IB Chemistry Reactivity 1.3 demands a sign convention early
IB Chemistry Reactivity 1.3 unpacked: bond enthalpies, Hess cycles, mean versus actual values, and the sign conventions that separate a level 6 from a 7 on Paper 1 and Paper 2.
Read post