A correct formula must:
Correct answer: A. Always conform to the valency rules
- A. Always conform to the valency rules
- B. Always have a subscript of 1 for the first element
- C. Always have a subscript of 2 for the second element
- D. Always be written in alphabetical order of the elements
Explanation
This is the correct answer. A correct chemical formula must always conform to the valency rules. Valency is the combining capacity of an atom, and it determines the number of bonds an atom can form. In a correct formula, the total positive charge must equal the total negative charge, ensuring that the compound is electrically neutral.
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About Fundamental Concepts of Chemistry
Mole calculations connect mass, number of particles and Avogadro's number, while balanced equations provide the mole ratios used in stoichiometry. Questions cover limiting and excess reactants, theoretical yield and percentage yield, including identifying which reactant is consumed first and comparing the actual product with the maximum possible product.
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