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Chemistry Student Questions - Page 3 | RevisionDojo

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Chemistry

R3.2 Electron transfer reactions

How Are Aldehydes/Ketones Reduced Back to Alcohols?

Learn how aldehydes and ketones are reduced to primary and secondary alcohols, with equations, oxidation-state reasoning, reagents, and IB exam tips.

R3.2 Electron transfer reactions

How Do You Calculate Standard Cell Potential From Electrode Potentials? (HL)

Learn how to calculate standard cell potential from standard electrode potentials, identify each electrode, and predict reaction spontaneity.

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R3.2 Electron transfer reactions

How Is Hydrogen Added to Alkenes and Alkynes (Reduction)?

Learn how catalytic hydrogenation reduces alkenes and alkynes, including bond changes, equations, catalysts, mole ratios, and IB exam technique.

R3.2 Electron transfer reactions

How Is Standard Cell Potential Related to Gibbs Energy? (HL)

Learn how ΔG° = −nFE° links standard cell potential and Gibbs energy, predicts spontaneity, and supports IB Chemistry HL calculations accurately.

R3.3 Electron sharing reactions

What Is a Radical and Why Are Radicals So Reactive?

Learn what radicals are, why unpaired electrons make them highly reactive, and how homolytic fission starts radical substitution in IB Chemistry.

R3.2 Electron transfer reactions

What Products Form When You Electrolyze an Aqueous Solution vs a Molten Salt? (HL)

Learn how molten salts and aqueous ionic solutions form different electrolysis products, including competing water reactions at both electrodes in IB Chemistry HL.

R3.3 Electron sharing reactions

Why Do Alkanes Undergo Radical Substitution Reactions With Halogens?

Learn why alkanes react with halogens by radical substitution, including UV initiation, propagation, termination, product mixtures, and exam tips.

R3.3 Electron sharing reactions

Why Do Chlorofluorocarbons (CFCs) Release Chlorine Radicals That Destroy the Ozone Layer?

Learn how UV light breaks CFC bonds, producing chlorine radicals that catalytically destroy stratospheric ozone in the IB Chemistry syllabus.

R3.2 Electron transfer reactions

How Are Alcohols Oxidized (Primary vs Secondary vs Tertiary)?

Learn how primary, secondary and tertiary alcohols are oxidized, including products, equations, conditions and key IB Chemistry exam distinctions for revision.

R3.3 Electron sharing reactions

What Is a Chain Reaction (Initiation; Propagation; Termination)?

Learn how initiation, propagation, and termination control radical chain reactions, using methane chlorination for IB Chemistry exam preparation at SL and HL.

R3.2 Electron transfer reactions

What Is Standard Electrode Potential (E°) and How Is It Measured? (HL)

Learn how standard electrode potential is measured against the standard hydrogen electrode and applied in IB Chemistry HL electrochemical cells.

R3.3 Electron sharing reactions

How Are Radicals Produced by Homolytic Fission (e.g. From UV Light)?

Learn how UV light causes homolytic fission to form radicals, with chlorine photolysis, electron movement, misconceptions, and IB Chemistry exam technique.

R3.2 Electron transfer reactions

How Do Acids React with Reactive Metals to Produce Hydrogen Gas?

Learn how reactive metals transfer electrons to hydrogen ions in acids, forming a salt and hydrogen gas, with IB equations and exam guidance for SL and HL.

R3.2 Electron transfer reactions

What Happens at the Anode and Cathode in Electrochemical Cells?

Learn where oxidation and reduction occur, how electrons and ions move, and why electrode signs differ in voltaic and electrolytic cells for IB Chemistry.

R3.2 Electron transfer reactions

How Does a Primary (Voltaic) Cell Generate Electricity?

Learn how a primary voltaic cell uses a spontaneous redox reaction, electron flow and ion movement to convert chemical energy directly into electrical energy.

R3.2 Electron transfer reactions

How Do Rechargeable (Secondary) Batteries Work?

Learn how secondary batteries use reversible redox reactions to discharge and recharge, including electron flow and electrode changes for IB Chemistry.

R3.2 Electron transfer reactions

How Do You Identify the Oxidizing Agent and Reducing Agent in a Reaction?

Learn to identify oxidizing and reducing agents using electron transfer and oxidation states, with a clear IB Chemistry example and practical exam tips.

R3.2 Electron transfer reactions

How Do You Determine Oxidation States of Atoms in a Compound?

Learn how to determine oxidation states using charge rules, algebra, and worked examples for IB Chemistry Reactivity 3.2 exam questions.

R3.1 Proton transfer reactions

What Do pH Curves Look Like for Weak Acid/Weak Base Titrations? (HL)

Learn how weak acid and weak base titration curves differ, including buffer regions, equivalence-point pH, curve shape, and indicator choice.

R3.1 Proton transfer reactions

What Is a Buffer Solution and How Does It Resist pH Change? (HL)

Learn how buffer solutions use a weak acid-base conjugate pair to resist pH changes, with equations and IB Chemistry HL exam guidance.

R3.1 Proton transfer reactions

How Do You Choose the Right Indicator for a Titration? (HL)

Learn how to select a titration indicator by matching its transition range to the equivalence-point region in strong and weak acid-base titrations.

R3.1 Proton transfer reactions

How Do Acid-Base Indicators Work and Why Do They Change Color at a Specific pH? (HL)

Learn how weak acid-base indicators establish equilibrium, why their colors depend on pH, and why the transition range is centered near the indicator's pKa.

R3.1 Proton transfer reactions

Why Is a Salt Solution Acidic, Basic, or Neutral? (Hydrolysis) (HL)

Learn how hydrolysis and parent acid-base strengths determine whether an IB Chemistry HL salt solution is acidic, basic, or neutral in aqueous solution.

R3.1 Proton transfer reactions

What Is pOH and How Is It Related to pH? (HL)

Learn what pOH measures, how to calculate it from hydroxide concentration, and why pH + pOH = 14.00 at 298 K for IB Chemistry HL questions.

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