Search over 10,000 free study notes

After the balloon has been blown up with air it increased its size by 0.02 g (Final mass - initial mass = mass of the air).We are told that of oxygen takes up 21% of air. Therefore, we need to work out 21...

Sodium chloride is an ionic compound formed by the strong ionic attractions between positively charged sodium ions (which have lost one electron) and negatively charged chloride ions (which have gained an...

When these atoms react together Calcium chloride, CaCl₂, is formed. Calcium atoms have two electrons in their outer shell, which can be determined from the fact they are in group 2 of the perio...

In nature, when 2 elements react, energy is taken in to break bonds and energy is given out to form new bonds. The net change in heat energy during a reaction at constant pressure is called the enthalpy c...

Kekulé's model of benzene is that it has 3 double bonds, in a ring of 6 carbons.
One - Benzene isn't very reactive, so if Kekulé's model were to be correct, there would be 3 double bonds in benzene, ...