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Chemistry
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Lewis electron - dot structure
The Lewis electron-dot model is based on the fact that all atoms combine to give compounds in which each atom or ion achieves the noble gas valence electron configuration of s2p6 (or s2 for hydrogen...
Lewis structure exercises
Practise drawing the Lewis structure of molecules using the exercises below. Select answers to see the correct drawings.
Periodic table quiz
Take this quiz to test your chemistry knowledge of the periodic table
Quantum numbers: the address of an electron
Quantum numbers are used to describe orbitals. This page will explain how to calculate the address of an electron
Quiz - quantum numbers
This Chemistry quiz will test your knowledge of atomic structures, electrons and quantum numbers
Quiz atomic structure
Take this quiz on atoms, their properties and atoms structures. If you need to revise this knowledge, see the atoms page above.
Quiz states of matter
Multiple choice quiz to test your knowledge of the states of matter in chemistry. Take this quiz and if you need revision, see the States of matter page
Solutions
A solution is composed of a solute and a solvent. When we dissolve a solute in a solvent, we can obtain a solution. To prepare a solution a known mass of solute
Solutions and concentrations
Learn what a solute is and how it relates to a solution and a concentration. In chemistry, we discuss solutes, solutions and concentrations to describe different substances. There are also units we...
States of matter
Matter is anything that has mass and occupies space. It includes things that can be seen (all living and non-living, natural and synthetic things) and cannot be seen to the naked eye (e.g. air and...
Stoichiometry
Stoichiometry describes the relationship between relative quantities of reactants and products in a balanced chemical equation.
Strength of acids and bases
What is the difference between a strong and a weak acid? How can you tell the strength of a base?
The Electron - an overview
Electrons are tiny particles that are revolving around the nucleus in circular orbits similar to the solar system. Energy of electron in orbit
The mole - exercises
How many acetaminophen molecules are present in 0.25mol of acetaminophen? From the mole concept and the Avogadro’s number, we know that one mole of acetaminophen contains 6.022×1023 acetaminophen...
The mole as a unit of measurement
In everyday language we say one dozen to describe 12 objects, a decade for ten years, a ream for 500 sheets of paper. In chemistry we use moles.