Lesson 5: Writing the Formulas and Names of Ionic Compounds
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Writing the Formulas and Names of Ionic Compounds
Objectives:
Write the name of an ionic compound when given the chemical formula of the compound.
Write the chemical formula of an ionic compound when given the name of the compound.
PART 1: Writing Ionic Formulas Practice
Rules for finding the formula for Ionic Compound:
Determine the charge of the metal when it forms an ion.
Determine the charge of the nonmetal when it forms an ion.
Combine the two ions to form an neutral compound. Determine the number of atoms of each element needed to balance positive and negative charges.
WATCH THIS! Watch the video below to understand the basics of writing chemical formulas for ionic compounds.
DIRECTIONS! For questions 1-7, determine the formula for each of the ionic compounds below.
You will not be able to type subscripts so your formulas may look like this P4O6.
Do not use Google! This is a skill that you HAVE to know how to do in order to be successful in AP Chemistry.
Question 1
1.
lithium bromide
Question 2
2.
magnesium oxide
Question 3
3.
calcium nitride
Question 4
4.
aluminum fluoride
Question 5
5.
cesium sulfide
Question 6
6.
strontrium phosphide
Question 7
7.
strontium chloride
The metals in the middle section of the periodic table are called transition metals. These metals can lose various amounts of electrons and therefore can form multiple charges.
Watch the video below to know how to write the formulas of ionic compounds that contain transition metals.
DIRECTIONS!For questions 8-13, determine the formula for each of the ionic compounds below.
You will not be able to type subscripts so your formulas may look like this P4O6.
Do not use Google! This is a skill that you HAVE to know how to do in order to be successful in AP Chemistry.
Question 8
8.
* Remember, prefixes are only used when the compound is covalent.
Question 9
9.
mercury (II) oxide
Question 10
10.
copper (I) chloride
Question 11
11.
nickel (I) oxide
Question 12
12.
lead (IV) sulfide
Question 13
13.
manganese (VIII) oxide
Polyatomic ions are created when a group of atoms that covalently bond together to form a compound. In order for those group of atoms to successfully bond together, electrons either had to be lost or gain which results in a charge forming. Since these compounds have a charge, they form ionic bonds. The list of polyatomic ions below are the ones that will most often be used in class.
Watch the video below to learn how to write chemical formulas for ionic compounds that contain polyatomic ions.
DIRECTIONS! For questions 14-18, determine the formula for each of the ionic compounds below.
You will not be able to type subscripts so your formulas may look like this P4O6.
Do not use Google! This is a skill that you HAVE to know how to do in order to be successful in AP Chemistry.
Question 14
14.
copper (I) hydroxide
Question 15
15.
aluminum nitrate
Question 16
16.
iron (II) phosphate
Question 17
17.
cobalt (II) phosphite
Question 18
18.
ammonium sulfate
Question 19
19.
Draggable item
arrow_right_alt
Corresponding Item
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Part 2: Naming Ionic Compounds Practice
Rules for naming ionic compounds:
1) Write the name of the cation (+ charged ion).
IF the cation is a transition metal (a metal located in the d block) you must include a roman numeral the name to indicated the charge of the metal.
2) Write the name of the anion.
IF the anion is a nonmetal changed the ending of the name to -ide. For example, chlorine becomes chloride.
IF the anion is a polyatomic ion, write the name of the polyatomic as is. Do not change the ending of its name.
Watch the video below to see examples of how to name ionic compounds.
Directions!For questions 20-30, determine the name of each of the ionic compounds below.
Do not use Google! This is a skill that you HAVE to know how to do in order to be successful in AP Chemistry.
Question 20
20.
K2S
Question 21
21.
CuBr2
Question 22
22.
CoN
Question 23
23.
AlP
Question 24
24.
NaNO3
Question 25
25.
BaCl2
Question 26
26.
CaCO3
Question 27
27.
CuSO4
Question 28
28.
Fe2O3
Question 29
29.
Be3N2
Question 30
30.
Draggable item
arrow_right_alt
Corresponding Item
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arrow_right_alt
arrow_right_alt
arrow_right_alt
arrow_right_alt
arrow_right_alt
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What does the roman numeral in the name chromium (III) phosphide represent?
The amount of chromium ions in the compound
The amount of phosphorus ions in the compound
The charge of chromium
The charge of phosphorus
Match the correct ionic compound name to the correct formula. You will also be asked to identify the which formulas are incorrect formula as well.
magnesium carbonate
Cu2O
incorrect formula for copper (II) oxide
CuO
copper (II) oxide
Be3N2
beryillium nitride
Be2N3
incorrect formula for magnesium carbonate
MgCO3
incorrect formula for beryillium nitride
MgC
Match the ionic formula to the correct name. Not all of the names will have a matching formula so choose wisely!