Chemistry
Chemistry study notes: bonding, solutions and core concepts explained simply, with diagrams, worked calculations and practice questions.
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Polar vs Non-Polar Covalent Bonds and Molecules: Electronegativity, Shape and Worked Examples
How to tell polar from non-polar covalent bonds using electronegativity, and why molecular shape decides whether a molecule is polar.
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Solute vs Solvent: Definitions, Main Differences, Examples and Concentration Calculations
What solutes, solvents and solutions are, how they differ, why water dissolves so much, and how to calculate concentration.