Download Nomenclature – Compounds with Metals of Variable Valence

SNC2D - Chemistry
Molecular Compounds
Covalent or Molecular compounds form when two non-metals combine.
Molecular compounds have properties that distinguish them from non-metals.

Solubility in water – __________ are soluble in water, but most are _______.

Melting and boiling point – the forces holding the molecules together are quite ________– they
have ________ melting and boiling points

Conducitivity – molecular compounds do not form ________. Therefore they ____________
conduct electricity when dissolved in water.
Systemic Names (Prefix System)
Prefix
mono
di
tri
tetra
penta
hexa
hepta
octa
nona
Deca
Number
Writing
Formulas:
Examples:
1. Write the symbol of each element in the same order as in the name.
2. The prefix of each element indicates the number of atoms in the
formula, so the formula needs a subscript that matches the prefix (no
prefix means a subscript of 1). Do not cross-over any numbers.
dinitrogen pentoxide
carbon dioxide
___________________________
____________________________
Writing Names:
1. Given the formula, write the name of each element in the same order.
2. Use the subscripts to determine the prefix for each element in the
name. If there is no subscript, use the prefix “mono” (“mono” can be left
off of the first element).
Examples:
PCl5
NF3
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SNC2D - Chemistry
Practice I. Write the correct formulas for the following:
1. nitrogen pentachloride
6. silicon tetrachloride
2. silicon tetrabromide
7. carbon monoxide
3. arsenic trioxide
8. diarsenic trisulfide
4. carbon disulfide
9. phosphorus hexafluoride
5. carbon tetrachloride
10. dihydrogen monoxide
Practice II. Write 2 names for the following, using IUPAC and prefix rules
1. AsI3
6. SiBr4
2. CCl4
7. N2S3
3. NH3
8. SiO2
9. PF3
4. CS
10. CCl4
5. P2S5
PUTTING IT ALL TOGETHER
Names and Formulae
1.
Write the formula for each of the following compounds.
a. calcium fluoride
_______________
k. potassium sulphate
____________
b. carbon disulfide
_______________
l.
_______________
c. nitrogen triodide
_______________
m. aluminum hydroxide ______________
d. sodium phosphide
_______________
n. fluorine gas
_______________
e. dichlorine monoxide
_______________
o. silicon dioxide
_______________
f. iron (III) carbonate
_______________
p. calcium hydroxide _______________
barium nitride
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SNC2D - Chemistry
g. copper (II) sulfate
2.
_______________
q. nitrogen gas
_____________
h. diphosphorus pentasulphide __________
r. copper (I) nitrate
_______________
i. tin (IV) chloride
_______________
s.
sulphur trioxide
_______________
j. magnesium chlorate
_______________
t.
barium oxide
_______________
Write the names for the following compounds.
a. CCl4 _____________________________
k. NaNO3 __________________________
b. Mg(ClO3)2 ________________________
l. PCl5 ____________________________
c. PBr3 _____________________________
m. PF3 ____________________________
d. H2 gas ____________________________
n. Sn(OH)2 _________________________
e. PbS2 _____________________________
o. FeCl2 ___________________________
f. Al2(CO3)3 _________________________
p. N2O
g. Na2SO4 _________________________
q. CuClO3 ___________________________
h. Na2O ____________________________
r. Li3PO4 __________________________
i. Al2(SO4)3 __________________________
s. SnO ____________________________
j. H2SO4 (aq) __________________________
t. OF2 ___________________________
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