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Science 10 (4.2) Names and Formulas of Compounds
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(Refer to pp. 184 – 201 of BC Science 10)
Ionic compounds are made up of ____________ and
_______________ ions.
o All of the positive and negative ions organize in a pattern
called an _________ ____________.
o Ionic compounds form from the inside out as solid crystals.
THE CHEMICAL NAME OF IONIC COMPOUNDS
•
Ionic compounds are composed of positive ions and negative
ions.

The chemical name identifies the ______________ in
the compound.

The International Union of Pure and Applied Chemistry
(IUPAC) developed the rules naming compounds.

The chemical name always has ___ parts.
1. 1st part: ______________ ion, which is always a
__________ in a compound containing ____
elements.
2. 2nd part: _____________ ion, which is always a
__________________ in a compound containing
____ elements.
3. non-metal names end in "-____".
Science 10 (4.2) Names and formulas of Compounds
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Try these:
1. AlBr3
_________________________________
2. Li3P
_________________________________
WRITING THE FORMULA OF IONIC COMPOUNDS

contains _____________ to identify each _____.

show relative numbers of _____ in the compound.

shown by a ____________ number set to the
right of the symbol.
Try these:
1. Ca+2 with Cl-1
____________________________
2. potassium nitride
_______________________
MULTIVALENT METALS
Charge
Roman
Numeral
+1
+2
+3
+4
+5

Some transitional metals are multivalent.

multivalent metals: ________________________________
___________________________________________
_____
_________________________________________________________
____

To tell the difference between two ions of the same
+6
multivalent metal, ________________ and use a _________
+7
____________ to show the ion charge.
Try these:
1. lead(IV) oxide
Science 10 (4.2) Names and formulas of Compounds
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2. copper(I) fluoride
_______________________
Try these:
1. PbS
___________________________________
2. SnBr4
_______________________
POLYATOMIC IONS

polyatomic ion:__________________________________
_____________________________________________

carries an ____________________________
so it cannot exist on its own.

Ex. __________________________________
Try these:
1. potassium acetate
___________________________________
2. ammonium hydroxide
_______________________
Try these:
1. NaOH
___________________________________
2. (NH4)2CO3
_______________________
Complete the Practice Problems on pages 187-193 (at least 2 per section)
Science 10 (4.2) Names and formulas of Compounds
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NAMES AND FORMULAS OF COVALENT COMPOUNDS

compounds formed by the ___________ of electrons between
_____-_________ elements.
Formulas are _____ reduced like ionic compound formulas.


The ____________ _______________ of ________
of each element in the molecule is shown by the chemical
formula.

Ex. Hydrogen peroxide = H2O2 not HO

subscripts do not show the smallest whole number ratio;
they show the __________ ______________ of atoms
of each element in the molecule.
NAMING BINARY COVALENT COMPOUNDS

Prefix
binary covalent compound: ___________________________
Number
1
2
3
4
5
6
7
8
Science 10 (4.2) Names and formulas of Compounds
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___________________
9
_______________________
10
_______
___________________
_______________________
_______
•
can have only two atoms or many atoms.
•
prefixes are used in the name to show the number of atoms of
each element.
Rules for Naming Binary Molecular Compounds that DO NOT contain Hydrogen
Example 1:
Example 2:
CO
OCl2
1. Name the first element
in the formula.
2. Name the second
element, changing the
ending to the suffix -ide.
3. Add a prefix to each
name to show the number
Science 10 (4.2) Names and formulas of Compounds
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of atoms of each.
Try these:
1. OF2
_________________________________
2. P4O10
_________________________________
Covalent Compounds Containing Hydrogen

Steps for naming covalent compounds containing hydrogen will
be gone over in Ch. 5

Three compounds known before any standard naming system
was developed are methane, ammonia and water.

Ex.
CH4
methane
NH3
H2O
ammonia
water
WRITING THE FORMULA OF COVALENT COMPOUNDS
Writing Formulas for Two Element Covalen Compounds
Rule
Example 1
Example 2
chlorine
dinitrogen
monofluoride
tetraoxide
1. Identify the first nonmetal and use a subscript to
identify the number of atoms.
2. Identify the second nonScience 10 (4.2) Names and formulas of Compounds
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metal and use a subscript to
identify the number of atoms.
3. Write the formula.
Try these:
1. sulphur dioxide
2. selenium difluoride
______________________
_______________________
**Check p. 196 for helpful tips for naming both ionic and covalent
compounds.
Complete the Practice Problems on page 195 (at least 2 per
section) and p. 197 all
SUMMARY:
Science 10 (4.2) Names and formulas of Compounds
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