31P3
Question: Atomic number is the________ in the nucleus of an atom.
Answer: protons
Question: How many moles of Mg3P2(s) can be produced from the reaction of 0.570 mol Mg(s) with 9.17E-2 mol P4(s)?
6 Mg(s) + P4(s) → 2 Mg3P2(s)
Answer: 0.183 mol
Question: A compound is found to contain 74.76% by mass F and 25.24% by mass S, with a molecular weight of 254.14. What is the molecular formula for this compound?
Answer: S2F10
Question: Which of the following is the smallest mass
Answer: 2.87E-5 g
Question: Write a balanced chemical equation for the combustion of copper to yield copper(I) oxide.
Answer: 4 Cu(s) + O2(g) —> 2 Cu2O(s)
Question: Which of the following are a pair of isotopes?
Answer: same element- diff number of neutrons
Question: Which of the following compounds are named correctly?
CrCl3, chromium(II) chloride
2. PCl3, phosphorous chloride
3. NF3, nitrogen trifluoride
Answer: 3 only
Question: Identify the ions present in KClO4
Answer: K+ and ClO4-
Question: How many protons, neutrons and electrons are present in one ion of 31P3-?
Answer: protons = 15, neutrons = 16, electrons = 18
Question:
Answer: E