What is an element?

What is a compound?

What is a mixture?

I have a mixture and a compound. They are both made from iron and sulphur, but one of them is magnetic. Which one is it and why?

What does Iron and Chlorine react to make, and what does Magnesium, Chlorine and Oxygen react to make?

Is air a element, compound or mixture?

Is sea water a element, compound or mixture?

Is steel a compound, element, mixture or alloy?

What is Potassium Sulphate made up of?

How can you separate dissolved salt from water?