5.1 Acids and Alkalis

What is the property that describes the acidity or alkalinity of a substance?

• Biological property

• Physical property

• Chemical property

Which of the following is a characteristic of acids?

• Feels slippery

• Taste sour

• Taste bitter

Which of the following is a characteristic of alkalis?

(Choose more than one answer)

• Feels slippery

• Taste sour

• Taste bitter

Acids and alkalis cannot be detected by indicators.

• True.

• False.

You can make indicators from plants.

• True.

• False.

What is an indicator in chemistry?

• A solution of a dye that changes color in acidic and alkaline solutions.

• A solution of a dye that changes color in a neutral substance only.

• A solution of a dye that changes color in an alkali substance only.

• A solution of a dye that changes color in an acid substance only.

What can be used to make an indicator in a science lab?

• Toothpaste

• Baking soda

• Lemons

• Hibiscus flowers

What is the purpose of using an indicator in an experiment?

• To increase the pH of the solution

• To add color to the solution

• To detect the presence of acids and alkalis

• To neutralize the solution

In which of the following can you find an alkalis?

• Lemons.

• Limes.

• Toothpaste.

• In vomit.

which of the following is considered a neutral substance?

• Lemons.

• Water.

• Toothpaste.

• In vomit.