S3_UT#4

What is the pH range of an acid?

• 4-6

• 1-7

• 1-6

• 8-14

What would happen to blue litmus paper if it came into contact with an acid?

• It would turn red

• It would turn green

• It would stay blue

• It would turn pink

Which of the following pH values would be the weakest acid?

• 1

• 3

• 5

• 6

Which of the following chemical formulas is NOT an acid?

• HBr

• HF

• HCl

• LiOH

Which of the following statements is correct?

• Blue litmus paper turns red when placed in a base.
• Red litmus paper turns blue when placed in a base.
• Blue litmus paper stays blue when placed in an acid.
• Red litmus paper stays red when placed in a base.

What would be considered the weakest base? 

• 8
• 14
• 7

• 11

Pure water has a pH of 7. Pure water _______.

• is a base
• is a neutral substance
• could be either an acid or a base
• is an acid

The atomic number ALWAYS tells you what?

• number of electrons

• number of protons

• number of neutrons

• sum of electrons and protons in an atom.

In the modern periodic table elements are arranged by:

• atomic mass
• atomic number
• valence electrons
• number of isotopes

Atoms of elements that are in the same group have the same number of

• protons.

• neutrons.

• valence electrons.

• protons and neutrons.