GRADE 10: CHEMISTRY
TOPIC: IDENTIFYING BASES
Date: Tuesday, April 9th, 2013
PUZZLERS
Created by: Mr. Luoma
ELEMENT OF THE DAY
ELEMENT OF THE DAY

What element was used in trench warfare during
WWI?
ELEMENT OF THE DAY: CHLORINE
Atomic Number: 17
 17 Protons, 17 Electron
 Atomic Weight: 35.45
 Location: Group 17



Diatomic (Cl2)
Forms many
compounds

NaCl (table salt)
ELEMENT OF THE DAY: CHLORINE

Why is Chlorine cool to learn about?

Chlorine has saved more lives than it
has taken
Cheapest, most effective, and least harmful
disinfectant
 Found in common household chemicals
(bleach)
 Used to treat drinking and wastewater
 Used to prevent bacteria and algae in
swimming pools
 No long-lasting environmental effects


Main component of stomach acid

(HCl  hydrochloric acid)
ELEMENT OF THE DAY: CHLORINE

Properties of Chlorine
Stop at 5:03
 http://www.youtube.com/watch?v=BXCfBl4rmh0&NR
=1&feature=fvwp

Identifying Bases
(Page 225)
Bases are compounds that form hydroxide ions OH-(aq) when
dissolved in water. Bases can also be described in the following ways:
• Bases have a bitter taste.
• Bases are slippery to the touch.
• Bases can give serious chemical burns. They are corrosive to skin.
Copyright © 2010 McGraw-Hill Ryerson Ltd.
IDENTIFYING BASES

Teacher Interactive CD

‘Identifying Bases’ Video
Identifying Bases
(Page 225)
As with acids, there are two definitions for bases. The Arrhenius definition considers a
base to be a substance that dissociates in water to produce OH-. The Brønsted base
is defined more broadly as a proton acceptor. As with the definition for a Brønsted
Acid, the Brønsted base is not required to be in solution.
NaOH is found in
plumbing products,
while NaHCO3 is the
key ingredient in
baking soda.
Blank this out
Copyright © 2010 McGraw-Hill Ryerson Ltd.
Naming Bases
(Page 226)
Since many bases are ionic compounds, they follow the same
naming rules. Some bases have common names often found on
consumer products. The rules for naming bases are:
1. The first part of the name is that of the positive ion (cation),
the name of the metal.
2. The second part of the name always identifies the negative
ion (anion), the name of the non-metal. The name of the nonmetal ion always ends with the suffix -ide.
Copyright © 2010 McGraw-Hill Ryerson Ltd.
Naming Bases: Formulas, Names , and Uses
(Page 226)
Copyright © 2010 McGraw-Hill Ryerson Ltd.
Sodium Hydroxide in Industry
(Page 226)
As illustrated by the diagram below, sodium hydroxide (NaOH)
is one of the most important chemicals in industry. The majority
of sodium hydroxide is produced by the chlor-alkali process.
2NaCl(aq) + 2H2O (l)
2NaOH(aq) + Cl2(g)+ H2(g)
Copyright © 2010 McGraw-Hill Ryerson Ltd.
Writing Chemical Formulas for Bases
(Page 227)
The following steps should be followed when writing base formulas.
1. Use the periodic table and/or table of polyatomic ions to identify
the symbols for the cation and anion in the base and their
charges.
2. Add subscripts to balance the charges.
Copyright © 2010 McGraw-Hill Ryerson Ltd.
WRITING NAME & FORMULA FOR BASES
Work on the sheet handed out.
 We will take it up when people are finished.
 Be ready to provide the answers.


If you complete the front side, try to do the other
questions on the back

Naming and formula writing for both acids and bases
LITERACY TEST PREPARATION

Page 261 in Textbook

Multiple Choice






29. b.
30. d.
31. a.
32. a.
33. c.
Written Answer

34. Example: Magnesium is important to daily life,
playing a role in a number of important processes
from body processes to transportation.
SUPPORTING DOCUMENTS

ON Science 10 Textbook

Pages: 225 - 228
HOMEWORK

ON Science 10 Textbook
Pg. 227 #1-2
 Pg. 228 #1-8

HOMEWORK ANSWERS
Pg. 228

1. hydrogen ion and anion of the non-metal

2. Example:
HOMEWORK ANSWERS
Pg. 228



3. an acid
4. produce hydroxide ions when dissolved in
water, taste bitter or feel slippery
5.
a. calcium hydroxide
 b. phosphorous acid
 c. hydrogen fluoride
 d. potassium hydroxide

HOMEWORK ANSWERS
Pg. 228

6.
a. H3PO4
 b. HBr
 c. Mg(OH)2
 d. Al(OH)3


7.
a. HClO3(aq) → H+(aq) + ClO3–(aq), acid
 b. KOH(aq) → K+(aq) + OH–(aq), base

HOMEWORK ANSWERS
Pg. 228

8. Example: Group into either acid (HCl, H2SO4,
and HClO3) or base (NaOH, Ca(OH)2, and LiOH),
since each solution contains either a hydrogen ion
or an oxide ion.
NAMING & FORMULA WRITING FOR ACIDS
& BASES WORKSHEET
Formula  Name
Name  Formula

1) NaOH sodium hydroxide

10) hydrofluoric acid HF

2) H2SO3 sulfurous acid

11) hydroselenic acid H2Se

3) H2S hydrosulfuric acid

12) carbonic acid H2CO3

4) H3PO4 phosphoric acid

13) lithium hydroxide LiOH

5) NH3 ammonia

14) nitrous acid HNO2

6) HCN hydrocyanic acid

7) Ca(OH)2 calcium
hydroxide




8) Fe(OH)3 iron (III)
hydroxide
9) H3P hydrophosphoric
acid


15) cobalt (II) hydroxide
Co(OH)2
16) sulfuric acid H2SO4
17) beryllium hydroxide
Be(OH)2
18) hydrobromic acid HBr