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In the expression of formulas, the products are obtained from the __________;and essence "change partners" – that is plus to __________ and minus to plus.

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Answer: In the expression of formulas, the products are obtained from the REACTANTS; and essence "change partners" - that is plus to MINUS and minus to plus.

While expressing the formula, the products are obtained by reaction of the reactants. The reactants are written on left hand side and products on the right hand side.