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You can tell what are reactants or products if you know the equation for the chemical reaction. If the problem doesn't just straight out give it to you, you can figure it out yourself based on context clues from the problem.
We can use the model equation of aA+bB <=> cC +dD to guide us. I believe chemical equations are written this way. Reactants are on the left( A and B) because they react with each other to create products which are on the right of the equation (C and D). C and D are products and A and B are reactants. If the question does not give you the equation and just a product like ammonia 2NH3 then we would have to figure out the reactants that make ammonia, like N2 + 3H2 <=> 2NH3 we know this because ammonia is composed of Nitrogen and Hydrogen so we just add them together. Hope this helps
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