A mixture is made from different substances that are not chemically joined.For example powdered iron and powdered sulphur mixed together […]
Category: Chemistry
Free Chemistry online learning lesson notes and videos for Secondary school and High school students. The lesson notes, videos and interactive slideshows are built on curriculum that is designed to meet national and international O’ Level standard for Senior High School or Senior Secondary school students (SS1, SS2, SS3 or SHS1, SH2, SH3) and Grade 9, Grade 10, Grade 11 and Grade 12 students.
Free online lesson notes and videos for the following exam preparations: WAEC, JAMB, Cambridge O’Level, NECO, GCE, British IGSCE, KCSCE, United States and Canada High School Exam preparations, etc.
You can also use the search box to search for any specific lesson or topic.
Categories
Mixtures and Separation Techniques
Categories
Oxidation numbers
OXIDATION NUMBERS It is often useful to follow chemical reactions by looking at changes in the oxidation numbers of the […]
In chemistry, a compound is a substance that results from a combination of two or more different chemical element s, […]
Isotopes Definition: Isotopes are atoms with the same number of protons, but differing numbers of neutrons. Isotopes are different forms […]
Atoms are the basic units of matter and the defining structure of elements. Atoms are made up of three particles: […]
Categories
Molecules and Atomicity
MOLECULES AND ATOMICITY A molecule is the smallest particle in a chemical element or compound that has the chemical properties […]
Element Definition: A chemical element is a substance that cannot be broken down by chemical means. Elements are defined by […]
Categories
Changes in state of matter
A material will change from one state or phase to another at specific combinations of temperature and surrounding pressure. Typically, […]
In our daily life, we come across many objects, the knowledge about which can be gained by one or more […]