Chemistry Learning Hub

Expert-guided explainers, reference diagrams, and chemistry study guides for students.

Reaction Mechanisms

SN1 vs SN2 Reactions

Substrate, nucleophile, solvent, and stereochemical clues for choosing SN1 or SN2.

Chemistry Tools | 9 min read

Study Tips

How to Draw Lewis Structures

A reliable electron-counting workflow for skeletons, octets, lone pairs, and formal charge.

Chemistry Tools | 8 min read

Physical Chemistry

Gibbs Free Energy Explained

What delta G means, how spontaneity works, and how enthalpy and entropy compete.

Chemistry Tools | 8 min read

Solutions

Molarity Formula Guide

How to use M = n/V, convert volume, prepare solutions, and avoid common concentration errors.

Chemistry Tools | 10 min read

Reference

Periodic Trends Explained

Atomic radius, ionization energy, electronegativity, and how to reason across the periodic table.

Chemistry Tools | 9 min read

Acid-Base

pH and pOH for Acids and Bases

A practical guide to pH, pOH, hydrogen ion concentration, and hydroxide ion concentration.

Chemistry Tools | 8 min read

Stoichiometry

Limiting Reagent Step by Step

How to identify the limiting reactant, excess reactant, theoretical yield, and leftover amount.

Chemistry Tools | 10 min read

Physical Chemistry

Ideal Gas Law Units

How to use PV = nRT without unit mistakes in pressure, volume, temperature, and gas constant.

Chemistry Tools | 8 min read

Spectroscopy

NMR Chemical Shift Basics

How shielding, electronegative atoms, pi systems, integration, and splitting help interpret proton NMR.

Chemistry Tools | 9 min read

Lab Methods

Recrystallization Solvent Choice

How to choose a recrystallization solvent and troubleshoot oiling out, poor recovery, and impure crystals.

Chemistry Tools | 10 min read