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Respiration is a chemical reaction which takes place in living cells. It uses oxygen from the air and glucose from food to release energy to allow our body to function. Carbon dioxide and water are also m...

This is a typical GCSE chemistry question relating to collision theory. Collision theory states that for a reaction to occur, the reactant particles must collide at a sufficient level of energy. To answer...

Rearrange the first equation to give b as the subject.

b = 16 - 6a

Then substitute that equation for b into the second equation.

5a - 2(16 - 6a) = 19

Simplify this equation (re...

Firstly, let's move the x^​3's onto the same side (and preferably keep them positive). Let's add x^​3 to both sides, which means the RHS will now read '2x^​3 - 25' and the LHS will read '103'. Next we wan...

In a carbon dioxide molecule, the central carbon atom is surrounded by two areas of electron density. These are the bonds to the oxygen molecules. These areas of electron density are negatively charged an...