Week 8 Quiz

Which of the following sentences best describes the pH scale?

• The dilution of helium ions in a substance

• The concentration of hydrogen ions in a substance

• The pressure of hydrogen ions in a substance

• The temperature of a substance containing hydrogen ions.

Which of the following list of properties best describes an acid?

• Bitter taste, corrosive, pH below 7

• Sour taste, corrosive, pH above 7

• Turns blue litmus paper red, corrosive, pH below 7

• Turns blue litmus paper red, corrosive, pH above 7

Which of the following list of properties best describes a base?

• Bitter taste, not reactive with metals, pH below 7

• Sour taste, not reactive with metals, pH above 7

• Turns red litmus paper blue, not reactive with metals, pH below 7

• Turns red litmus paper blue, not reactive with metals, pH above 7

A substance with a pH of 1.9 is classified as:

• Mixture

• Acid

• Base

• Neutral

A lower pH level indicates a:

• Stronger base

• Stronger acid

• Weaker base

• Weaker acid

A higher pH level indicates:

• Stronger base

• Stronger acid

• Weaker base

• Weaker acid

In general terms, a chemical reaction that occurs between an acid and a base is called:

• Homogenous mixture

• Heterogeneous mixture

• Purified solution

• Neutralization

Complete the following chemical reaction: Acid + Base --> _______ + ________

• Water + oxygen

• Water + hydrogen

• Salt + oxygen

• Salt + water

True or False: a neutralization always means that the resulting pH is 7.

• True

• False

A substance with a pH of 7.5 is classified as:

• Mixture

• Acid

• Base

• Neutral