IB Chemistry · · 5 min read
IB Chemistry: Why Some Molecules Break the Octet Rule
IB Chemistry guide to octet rule exceptions: electron-deficient atoms, expanded octets, and radicals, plus exam tips and RevisionDojo practice.
Back to all posts
Recently uploaded
Showing to of articles, newest first.
IB Chemistry · · 6
IB Chemistry: Periodic Patterns and Quantum Structure
IB Chemistry guide to why periodic patterns reflect quantum structure: electron configurations, shielding, and Zeff explained for exam answers.
IB Chemistry · · 6
IB Chemistry: Why Bond Polarity Comes From Electronegativity
IB Chemistry guide to bond polarity: learn how electronegativity differences shift electron density, create dipoles, and change properties, fast.
IB Physics · · 5
IB Physics: Energy Shifts in Simple Harmonic Motion
IB Physics guide to how energy shifts during SHM: kinetic to potential and back, why it happens, and how to explain it clearly in exams.
IB Physics · · 6
IB Physics: Induction and Energy Conservation Explained
IB Physics guide to how induction embodies energy conservation using Lenz’s law, generators, and transformers, plus exam-ready tips and links.
IB Physics · · 6
IB Physics: Thermodynamic Laws Limit Engine Efficiency
IB Physics guide to why thermodynamic laws cap engine efficiency: first law, entropy, and the Carnot limit explained for exam success.
IB Physics · · 6
IB Physics: Why Waves Model Energy Transfer So Well
IB Physics guide to why waves are a powerful model for energy transfer: oscillations move energy, not matter, with superposition and interference.
IB Physics · · 6
IB Physics: Conceptual Difference Between Heat and Work
IB Physics guide to the conceptual difference between heat and work: random vs directed energy transfer, exam-ready definitions, examples, and FAQs.
IB Chemistry · · 5
IB Chemistry: Why Oxidation and Reduction Happen Together
IB Chemistry guide to why oxidation and reduction always occur together. Learn electron transfer, half-equations, and exam-ready redox logic fast.
IB Biology · · 6
IB Biology: How Restriction Enzymes Cut DNA Precisely
IB Biology guide to how restriction enzymes recognize palindromic DNA sites, form sticky/blunt ends, and power gene technology revision for exams.
IB Physics · · 5
IB Physics: Why Thermal Energy Flows Hot to Cold
IB Physics guide to why thermal energy flows from hot to cold: particle collisions, probability, entropy, and what exam questions really test.
IB Chemistry · · 6
IB Chemistry: Why Shape Depends on Electron Pair Repulsion
IB Chemistry explanation of why molecular shape depends on electron pair repulsion (VSEPR), with examples, angles, and exam-ready tips.
IB Chemistry · · 7
IB Chemistry: Balanced Equations Show Mole Ratios
IB Chemistry guide: learn why balanced equations represent mole ratios, not mass ratios, and how this powers stoichiometry and exam calculations.
IB Chemistry · · 5
IB Chemistry: Why Boiling Needs More Force Than Evaporation
IB Chemistry guide: why boiling breaks more intermolecular forces than evaporation. Learn surface vs bulk, vapor pressure, and ΔHvap with exam tips.
IB Physics · · 6
IB Physics: How Moving Charge Creates Magnetism
IB Physics guide to how moving charge creates magnetic effects. Learn field direction, currents, coils, and exam tips with RevisionDojo resources.
IB Chemistry · · 6
IB Chemistry: Why Acids Donate Protons, Bases Accept
IB Chemistry explained: learn why acids donate protons while bases accept them, using polarity, lone pairs, and conjugate pairs for exam clarity.
IB Physics · · 6
IB Physics: Why Waves Move Without Moving Matter
IB Physics guide to why waves need no net movement of matter. Learn oscillations, energy transfer, key examples, and exam-ready explanations.
IB Chemistry · · 6
Why Some Reactions Release More Energy (IB Chemistry)
IB Chemistry guide to why some reactions release more energy than others: bond enthalpy, stability, entropy, and exam-ready ways to explain ΔH.
IB Biology · · 5
IB Biology: Why Different Cells Express Different Genes
IB Biology guide to why different cells express different gene subsets: transcription factors, epigenetics, signals, and exam-ready tips.
IB Chemistry · · 10
IB Chemistry: Gases vs Solids and Liquids
Learn why gases behave differently from solids and liquids at the particle level, with IB Chemistry explanations, examples, and exam-ready phrasing.
IB Chemistry · · 6
IB Chemistry: Why Atomic Mass Is a Weighted Average
IB Chemistry guide to why atomic mass is a weighted average of isotopes, with a quick method, chlorine example, and exam tips for Ar questions.
IB Physics · · 5
IB Physics: Why Masses Influence Each Other Across Space
IB Physics guide to why all masses influence each other across space: fields, inverse-square law, and relativity, with exam-ready tips and links.
IB Physics · · 6
IB Physics: Why Energy Conservation Is Universal
IB Physics guide to why energy conservation is universal: symmetry in time, energy transfers, and how to use it for faster exam problem solving.
IB Physics · · 6
IB Physics: Half-Life and the Statistical Nature of Decay
IB Physics guide to half-life as statistical decay: why single nuclei are unpredictable but large samples follow exponential laws and stable half-lives.
