Labelling units in the exam

[sin0001]

Are the examiners going to take marks off if we don't include units for everything, like when we are using the pv=nrt equation, do we have to write the units of every variable (such as litres, kPa or Kelvin), and when we are finding the mass of something, do we have to say blah blah mols x blah gmol-1  ?

[vea]

You don't have to show units for every step of the working out, just make sure that you include them for final answers.