When you look at the formula of a compound how can you tell whether it is a molecular compound or an ionic compound?
Which elements in the periodic table have only one possible charge in ionic compounds when they appear as monatomic ions? Use group numbers to identify and write down the charges expected for these ions. For example, Group 1 has elements that all form an ion with a +1 charge.
Why is the formula of a compound made of magnesium ions (Mg2+) and oxide ions (O2–) written as MgO and not Mg2O2?
Explain why you can’t change the subscripts in the
formulas of polyatomic ions like PO43- or NH4+.
When are parentheses necessary in writing the formulas of ionic compounds? Why are they used?
What is the meaning of the roman numerals after the names of some metal elements’ ions? For example, Fe2+ is called iron(II).
When writing the name of an ionic compound containing a metal ion which sometimes has one ionic charge and sometimes has another how do you know which ion name to use? For example, PbCO3 and Pb(CO3)2 are different compounds with different names. What are their names and how did you figure it out?
Give the names of the binary acids: HF, HCl, HBr, HI, H2S.
What are oxyanions? Write the name and formula of all four oxyanions of chlorine.
What are oxyacids? Give the name and formula of the oxyacids of chlorine and the oxyacids based on phosphate, sulfate, and nitrate.
What do the suffixes –ide, –ite, and –ate mean?
Name the following compounds. The compounds may be ionic, molecular, acids, or elements. Decide which category the formula belongs to and name it appropriately.