13 is definately A, athletes dont need salts before competition or untill about 2-3 hours into it and can actually make them sick having too much salt before it.
yea they are all right except i buggered one up 8 i put c had no idea so had a punt didnt really learn the content as i had physics yesterday and chem tomorrow lol
but for someone who did very little study i think that exam was GOOD!