Compound Writing Review Worth 20 Test Points.
Assignment: Where necessary, put in the symbol, the oxidation number/charge, the subscripts, and the
name. For every multiple of 7, you must calculate the molar mass of the compound.
You must be able to know the names of an element given its symbol. This includes the first 18, all of the
alkaline metals, alkaline earths, and the halogens. This also includes Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Se, Ag,
Cd, Sn, Pt, Au, Hg, Pb, and U.
Naming Rule 1: The first element in a compound, the cation (the positive one), keeps its name. Elements
that have negative oxidation numbers/charges have names that end in “ide” when they are in compounds.
They are Carbide, Nitride, Oxide, Fluoride, Phosphide, Sulfide, Chloride, Selenide, Bromide, Telluride,
Iodide, and Astatide. This rule ALWAYS applies.
Naming Rule 2: Metals with more than one positive oxidation number/charge will have the positive
oxidation number/charge given to you. In the name you must add a roman numeral equal to the
oxidation number/charge. For example Co3+. In a compound with Sulfur, Co2S3, its name is Cobalt III
Sulfide.
Naming Rule 3: Non-metals that can have positive oxidation numbers/charges will have the positive
oxidation number/charge given to you. In the name you must add prefixes equal to the subscripts. For
example S6+. In a compound with Fluorine, SF6, its name is Sulfur Hexafluoride. The first element never
uses the prefix mono and carbon never uses a prefix in these kinds of compounds.
Hydrogens added to common polyatomic ions have the charge of +1 and reduce the negative charge of the
ions as follows: H1+ and CO32– = HCO31– Hydrogen Carbonate. H1+ and PO43– = HPO42– Hydrogen
Phosphate. 2 H1+ and PO43– = H2PO41– Dihydrogen Phosphate. H1+ and SO42– = HSO41– Hydrogen
Sulfate.
You need to memorize the polyatomic ions in the chart below, the names, the symbols, and the charge.
Ion Name
Ammonium
Hydronium
Symbol
NH41+
H3O+1
Ion Name
Chromium III
Iron III
Lead III
Symbol
Cr3+
Fe3+
Pb3+
Ion Name
Acetate
Chlorite
Cyanide
Dihydrogen
Phosphate
Hydrogen
Carbonate
1+
Copper I
Cu
Silver
Mercury I
Ag1+
Hg22+
Lead IV
Tin IV
Pb4+
Sn4+
Cadium II
Cd2+
Fluoride
F1–
Chromium II
Cr2+
Chloride
Cl1–
Cobalt II
Copper II
Iron II
Lead II
Co2+
Cu2+
Fe2+
Pb2+
Bromide
Iodide
Br
I–1
1–
Oxide
O2–
Bromate
Chlorate
(Bicarbonate)
Hydrogen
Sulfate
(Bisulfate)
Hydroxide
Hypochlorite
Nitrate
Nitrite
Symbol
CH3COO1–
C2H3O21–
BrO31–
ClO31–
Symbol
CO32–
CrO42–
Cr2O72–
HPO42–
ClO21–
CN1–
H2PO41–
Ion Name
Carbonate
Chromate
Dichromate
Hydrogen
Phosphate
Oxalate
Peroxide
Sulfate
HCO31–
Sulfite
SO32–
Phosphate
Arsenate
PO43–
AsO43–
C2O42–
O22–
SO42–
HSO41–
OH1–
ClO1–
NO31–
NO21–
Manganese II
Mercury II
Nickel II
Tin II
Zinc II
Mn2+
Hg2+
Ni2+
Sn2+
Zn2+
Sulfide
S2–
Nitride
Phosphide
N3–
P3–
Carbide
C4–
ClO41–
Permanganate MnO41–
Perchlorate
I.
For numbers 1-160, use either the given oxidation number/charge or use the table of group numbers and oxidation
numbers to assemble the molecule with subscripts. If the atom does not have an oxidation number, you need to
give it an oxidation number based on the table below. Name the compound. For every 7th problem (bold faced
and
underlined) calculate the molar mass.
II. For numbers 161-256, change the names into symbols. Put in oxidation numbers or charges (polyatomic ions have
charges) and assemble the molecule with subscripts. For every 7th problem (bold faced and underlined)
calculate the molar mass.
1
2
13
14
15
16
17
18
1+
2+
3+
4+
2+
33+
5+
22+
4+
6+
11+
3+
5+
7+
0
Group
Oxidation #
Li
Sn4+
Ba
Al
Ti4+
NH4+
Fe3+
Pb2+
ClO3–1
S
AsO43–
SO32–
N
Br
1
9
17
25
2
10
18
26
3
11
19
27
4
12
20
5
13
6
21
28
BrO3–
ClO2–1
O
33
41
34
49
50
Fe2+
Ag+
Be
Pb4+
Na
Ni3+
Sn2+
Co3+
3+
P
N3+
P5+
C2+
43
51
42
57
NO3
CO3
35
58
–1
2–
59
–1
2–
ClO–1
7
SO42–
29
22
30
15
23
31
8
16
24
32
CH3COO-1
PO43–
P
Cr2O72–
36
44
52
37
45
53
38
46
54
39
47
55
40
48
60
61
62
63
PO43–
64
C2O42–
ClO3–1
SO4
14
2–
56
O22–
OH
CO3
65
66
67
68
69
70
71
72
73
81
89
74
82
90
75
83
76
77
84
92
79
87
95
80
88
96
C2H3O2–1
CrO42–
98
91
NO2–1
85
93
78
86
94
HPO42–
OH–1
CN–1
ClO4–1
MnO4–1
99
100
101
102
103
104
107
115
108
116
109
117
110
118
111
112
113
106
114
119
120
121
122
123
124
125
127
128
F
Cl
S
Te
N
I
129
137
130
138
131
139
132
Se
133
126
Br
140
141
134
142
135
143
136
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
97
105
Cobalt III
Silver (+1)
Antimony (+5)
Sulfur (+4)
Potassium
Nickel II
Tin IV
Chromium VI
Barium
Iron II
Gallium
Zinc (+2)
Nitrite
Chromate
Arsenate
Chlorite
Iodide
Hydrogen
Carbonate
Cyanide
HypoChlorite
161
169
162
170
163
171
164
172
165
166
173
174
167
175
168
176
177
185
178
186
179
180
187
188
181
189
182
190
183
191
184
192
Acetate
Hydroxide
Dihydrogen
Phosphate
Sulfide
Phosphate
Perchlorate
Permanganate
193
194
202
196
204
197
205
198
206
199
207
200
201
195
203
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
Chlorate
Carbonate
Oxide
Sulfate
Phosphate
Nitrate
Peroxide
225
Chloride
226
227
228
229
230
231
232
233
241
234
242
235
236
243
244
237
245
238
246
239
247
240
248
249
250
251
252
253
254
255
256
Oxalate
208