8.6C EXPERIENCE ACID & BASES Lecture Presentations.

TEKS 8.6D

Acids and Bases

KEY IDEAS

• What are acids and bases?
• What are the properties of acids and bases?
• Where do you find acids and bases?

Words to Know

acid
base
corrosive
neutral
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Copyright © Savvas Learning Company LLC. All Rights Reserved. Savvas is not responsible for any modifications made by end users to the content posted in its original format.

What are acids and bases?

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What are acids and bases? continued

An acid is a substance that has a pH below 7 on
the pH scale.

A base is a substance that has a pH greater than 7 on
the pH scale.

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Household Acids and Bases

Identify Match the pH numbers to the liquids.

7

11

3

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water

orange juice

bleach

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Household Acids and Bases Answers

Identify Match the pH numbers to the liquids.

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water

orange juice

bleach

3

7

11

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What are the properties of acids and
bases?

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What are the properties of acids and
bases? continued

Some compounds that are
about pH 7 are not acids or
bases. They are neutral. Acids
and bases are corrosive,
meaning they can break down
some materials. Acids corrode
(break down) some metals and
stones. Bases corrode organic
materials such as fats.

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Properties of Acids

1.

2.

3.

4.

5.

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Properties of Acids Answers

1.

pH under 7

2.

Sour taste

3.

Can burn if touched

4.

Corrodes metal

5.

Turns blue litmus
paper red

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Properties of Bases

1.

2.

3.

4.

5.

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Properties of Bases Answers

1.

pH over 7

2.

Bitter taste

3.

Slippery to touch

4.

Turns red litmus
paper blue

5.

Corrodes organic
material

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Where do you find acids and bases?

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Where do you find acids and bases? continued

Acids and bases are easy to find
in nature. Limestone, a type of
stone, is a base. In some polluted
areas, sulfur enters the air and
mixes with rain, causing acid rain.
Acid rain can corrode stone
statues like this lion.

Plants can contain acids, and the
human digestive system produces
hydrochloric acid. Venoms tend
to be basic.

Acids and bases are also
manufactured for cleaning,
cooking, and other purposes.

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Sorting Acids and Bases

Give Examples Use the examples to complete the table.

Examples

detergents

citrus fruits

crushed limestone

vinegar

drain cleaner

Acids

BasesBases

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Sorting Acids and Bases Answers

Give Examples Use the examples to complete the table.

Examples
Acids

citrus fruits

vinegar

Bases

detergents

crushed limestone

drain cleaner

Multiple Choice

William was conducting a science experiment and found that a certain substance had a pH less than 7. This substance is likely a(n) ______.

• Acid

• Alkaline

• Base

• Buffer

Multiple Choice

David was conducting a science experiment and found a substance with a pH greater than 7. This substance is a(n) _______.

• Base

• Acid

• Buffer

• Water

Multiple Choice

Samuel, Michael, and Henry are in a chemistry lab. Samuel has a strong acid and Michael has an equally strong base. What might happen if they mixed these two substances?

• There would be an explosive chemical reaction.

• The acid Samuel has would destroy the base Michael has.

• The base Michael has would destroy the acid Samuel has.

• They'd wind up with a pH-neutral substance.

Multiple Choice

The pH scale is a range from:

• 1-7
• 0-14
• 1-14
• 1-20

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Exit Ticket

Choose one of the following
activities to compare and
contrast acids and bases.

1.

Draw your own version of the pH scale,
with real-world examples of acids and
bases and captions describing the
properties of each.

2.

Make a T-chart or Venn Diagram to
compare and contrast acids and bases.
Include at least one example of an acid
and base.

Multiple Choice

A(n) ______ is a substance with a pH less than 7

• Acid
• Alkaline
• Base
• Buffer

Multiple Choice

A(n) _______ is a substance with a pH greater than 7.

• Base
• Acid
• Buffer
• Water

Multiple Choice

What is the only substance with a neutral pH of 7?

• Milk
• Orange Juice
• Water
• Blood

Multiple Choice

Which solution releases H+ in solution?

• Base
• Acid
• Buffer
• Water

Multiple Choice

This substance releases OH- into solution

• Acid
• Base
• Neutral

Multiple Choice

A solution with a pH of 3.6 would be...

• Acid
• Base
• Neutral
• Acid and Base

Multiple Choice

A solution with a pH of 8.6 would be...

• Acid
• Base
• Neutral
• Acid and Base

Multiple Choice

Which is most acidic?

• Baking Soda
• Lemon Juice
• Black Coffee
• Milk

Multiple Choice

Tastes Sour

• Acids
• Bases
• Salts
• All

Multiple Choice

Tastes bitter.

• Acids
• Bases
• Salts
• All

Multiple Choice

According to the pH range which substance is more acidic than lemon juice

• Hydrochloric acid
• cabbage
• milk

Multiple Choice

Bleach is a strong base, what is the pH level of bleach?

• 13
• 14
• 1
• 2

Multiple Choice

Feels slippery.

• Acids
• Bases
• All