Answers

2016-03-12T09:02:01+05:30
Each substance is then represented by its correct chemical formula. For ionic compounds (such as aluminum sulfate), the subscripts in the formula are determined by charge balancing (two Al3+ are needed to balance three SO4 2- ): Al (s) + H2SO4 (aq)  H2 (g) + Al2(SO4)3 (aq)
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2016-03-12T09:11:31+05:30
Steps involved in writing a chemical equation are:
1. Write the symbols out there formulae of the reactants in the left hand side, with a (+) sign between them.
2. Write the symbols or the formulae of the products on the right hand side, with a (+) sign between them.
3. Put the sign of an arrow (-->) in between the reactant side and the product side.
4. Represent the reactants and the products in their molecular forms [because their atomic forms are usually neither stable not capable of separate existence].

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