How do rockets work? What chemicals are used and what reactions happens with those chemicals to make a rocket fly?

Chemical rocket engines use a fuel (something to burn) and an oxidiser (something to react with the fuel) ... As the propellant reacts inside a combustion chamber, the chemical reaction produces hot gases. It is the ejection of these rapidly expanding hot gases at high speed from the rocket nozzle that

(I found this on a website called Science Learning. Full credit to them and their work. Check it out for more information)