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[Music] hi and welcome back to three science lessons Co you K by the end of this video you should be able to balance chemical equations lots of students think this topics tricky but Ill show you a method that always works before I start Im going to recap whats meant by a chemical formula as that will help us later this shows the formula of the compound sodium carbonate remember that capital letters tell us that we have an element so you can see that weve got three elements in this compound weve got sodium carbon and oxygen so lets look at the number of atoms of each element the little two on the right of the sodium tells us that weve got two atoms of sodium theres no little number on the right of the carbon so that means weve got one atom of carbon finally the small three on the right of the oxygen tells us that weve got two silly opt-ins of oxygen now this brings us to one of the most important rules in chemistry you are never allowed to change the small numbers and a chemi