If you can answer this question I will think you are the master of chemistry but could never do this. This are the toughest question ever, only genius can do this.
1. Why should a chemical equation be always used?
2. How are the elements with variable valency named?
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1.to obey the law of conservation of mass. because matter neither be created nor be destroyed
2)by their properties and mass
2)by their properties and mass
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