PrepPals 21-day Chemistry revision checklist



[ ] Day 1: States of Matter and Properties
Describe the material and distinguish the property or change being discussed.

[ ] Day 2: Pure Substances and Separation Methods
Identify the mixture and explain what a separation method needs to achieve.

[ ] Day 3: Metals, Acids, Bases, and Basic Reactions
Classify the substances and recognise the broad reaction being described.

[ ] Day 4: Balancing Chemical Equations
Check that your equation represents the substances and reaction consistently.

[ ] Day 5: Mole Concept and Avogadro's Number
Identify the quantity and unit in a mole question before calculating.

[ ] Day 6: Solution Concentration and Dilution
Distinguish concentration from amount and identify what changes during dilution.

[ ] Day 7: Gas Volume and Ideal Gas Law
Check the gas quantities and the conditions stated in the question.

[ ] Day 8: Atomic Structure and Electron Configuration
Connect particle structure with the information a question gives you.

[ ] Day 9: Periodic Table and Element Trends
Locate the elements and explain the trend you would compare.

[ ] Day 10: Oxidation Numbers and Redox Reactions
Identify what changes in a redox reaction and record uncertain classifications.

[ ] Day 11: Chemical Bond
Distinguish bonding questions from questions about the whole substance.

[ ] Day 12: Molecular Polarity and Intermolecular Forces
Check whether the question concerns molecular structure or interactions between particles.

[ ] Day 13: Reaction Rates and Equilibrium
Distinguish reaction-rate questions from equilibrium questions before selecting an approach.

[ ] Day 14: Acids, Bases, and pH
Identify the acid–base situation and explain what a pH question asks you to compare.

[ ] Day 15: Solubility and Solubility Curves
Read the conditions and axes before interpreting a solubility question.

[ ] Day 16: Galvanic Cells and Electrolysis
Identify the type of cell and the processes you need to analyse.

[ ] Day 17: Gas Preparation and Gas Testing Methods
Explain the aim of a gas-preparation or testing step, without copying a procedure.

[ ] Day 18: Metal Reactivity and Common Ion Tests
Use the stated observations to identify what needs checking about a metal or ion.

[ ] Day 19: Organic Chemistry Basics
Recognise the main type of organic question and list the ideas you still need explained.

[ ] Day 20: Organic Reactions and Biomolecules
Connect the reaction or biomolecule with its broad role; record unclear relationships.

[ ] Day 21: Full Mock Test and Review
Review an earlier mock and retry recurring errors. Ask for feedback on unresolved reasoning.



2H₂O represents two water molecules: four H atoms and two O atoms in total. H₂O gives the composition of each molecule: two H atoms and one O atom. Balance equations by changing coefficients; keep the formulas intact.

Before using a reaction ratio, balance the equation and check the atom count on both sides.

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