1) What would be the correct name for MnO2? – 3 pts
A. Manganese oxide B. Manganese (II) oxide
C. Manganese (IV) oxide
D. Magnesium oxide
Each oxygen has a -2 charge. We have two oxygens
-2(2) = -4
Our metal, Manganese has to balance out this -4 charge and there is only one. So the one manganese has a +4 charge
A Manganese is colored in so it needs a roman numeral
B Manganese charge is wrong
C correct
D Mn is manganese not magnesium
2) What is the correct formula for Mercury (I) bromide? – 2 pts
A. HgBr
B. HgBr2
C. Hg2Br
D. Hg2Br2
Mercury (I) has a +1 charge. Bromide has a -1 charge. Exchanging the numbers (criss-cross) gives you HgBr
A correct
B wrong number of bromine
C wrong number of mercury
D can be simplified
3) What is the correct formula for Platinum (IV) hydride? – 2 pts
A. PtH2
B. PtH4
C. Pt2H
D. Pt4H
Each hydride has a -1 charge. We have four hydrides
-1(4) = -4
Our metal, platinum has to balance out this -4 charge and there is only one. So the one platinum has a +4 charge
4) What would be the correct name for CdS? – 1 pt
A. Cadmium sulfide B. Cadmium (II) sulfide
C. Cadmium sulfide (II)
D. Cadmium sulfur
Sulfide has a -2 charge. Cadmium has to balance out this negative charge and there is only one. Cadmium has to have
a +2 charge and since cadmium is colored in, there will be a roman numeral.
5) What would be the correct formula made from the following ions: Ba2+, Cl1- - 1 pt
A. Ba2Cl2
B. Ba2Cl
C. BaCl
D. BaCl2
Criss-cross
6) What would be the correct name for the compound made from the following ions: Ba2+, Cl1- - 3 pts
A. Barium chloride (II) B. Barium (II) chloride
C. Barium chloride D. Barium chlorine
Barium is not colored in so there are no roman numerals. The ending of the compound has to be - ide
7) What would be the correct formula made from the following ions: Fe2+, O2- - 2 pts
A. FeO
B. FeO2
C. Fe2O
D. OFe
Criss cross gives you
Fe2O2 this simplifies because each of those number can be divided by 2
8) What would be the correct name for the compound made from the following ions: Fe2+, O2- - 2 pts
A. Iron oxide
B. Iron (II) oxide
C. Iron (III) oxide
D. Iron Oxide (III)
Iron is colored in so we need a roman numeral. The charge of iron is +2, so we use the roman numeral for 2 (II)