In each of the following multiple-choice questions, place the letter of the correct response in the blank at the left. There is only one correct response for each question.
1.19 d [Algorithmic]In which of the following pairs of chemical formulas do the two members of the pair contain the same number of elements as well as the same number of atoms? a) Hf and HF b) CoCl 2 and COCl 2 c) SO 2 and SO 3 d) NH 4 Cl and BaSO 4
1.31 b In which of the following sequences of elements do all members of the sequence have chemical symbols starting with the same letter? a) sulfur, silicon, sodium b) gold, silver, aluminum c) potassium, phosphorus, lead d) more than one correct response e) no correct response
For each set of elements on the left, choose the appropriate characterization of the set’s chemical symbols from the response list on the right. Responses on the right may be used more than once or need not be used at all.