In this video we look at the basics of algebra, focusing on the notation that is used.
In algebra we use symbols to represent numbers. These symbols are called variables. Some reasons for using symbols instead of numbers is that the symbols, or variables, can represent unknown quantities and for showing formulae like the area of a circle.
Instead of writing a X b we remove the multiplication sign and just write ab instead. Two letters next to each other or a number and a letter, means those things are multiplied together.
We use a curly x for the letter because otherwise it looks like a multiplication sign.
Instead of the division sign, in algebra we usually write it as a fraction. Numbers are usually left as fractions rather than as decimals.
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Respiration is the chemical process that supplies the body with energy for all other life processes: growth and repair of cells, muscle contraction, protein synthesis, sending nerve impulses, absorbing molecules in active transport to name just a few.
It happens in ALL living cells, not just anima

An acid is a substance that will dissociate in water to give a proton (or H+ ion) and a conjugate base. An acid is considered to be strong if dissociation nears 100%, and weak if dissociation is usually less than 1%.
In this lesson, we will learn about strong alkalis and weak alkalis.
An alkali

Watch the final part of the 'using moles' videos, to complete your understanding of the chemical calculations topic.
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This video is part of 'Chemistry for All' - a Chemistry Education project by our Charity Fuse Foundation - the organisation behind The Fuse S