HW01 Fundamentals of Chemistry
Subject:
Chemistry [1]
marial (apm856) ? H01: Fundamentals ? mccord ? (50960) 1 This print-out should have 16 questions. Multiple-choice questions may continue on the next column or page ? find all choices before answering. 001 10.0 points Which compound has the wrong chemical for- mula? 1. Mg(OH)2 2. (NH4)2SO4 3. CaOH correct 4. Ba3(PO4)2 Explanation: The calcium ion is Ca2+; the hydroxide ion is OH?. Two OH? are needed to balance the charge of each Ca2+, so the formula is Ca(OH)2. The magnesium ion is Mg2+; the hydroxide ion is OH?. Two OH? are needed to balance the charge of each Mg2+, so the formula is Mg(OH)2. The barium ion is Ba2+; the phosphate ion is PO3?4 . Two PO3?4 are needed to balance the charge of every three Ba2+. (This gives a total anion charge of ?6 and a total cation