Acids and bases Practice Regents

Which of the following word pairs correctly completes the sentence below?
_______ are corrosive substances characterized as having a strong smell, a sour taste, and a _______.

• Acids; pH less than 7
• Acids; pH greater than 7
• Bases; pH greater than 7
• Bases; pH less than 7

The esophagus is the tube that connects the mouth to the stomach. Heartburn occurs when some of the stomach juices flow backwards up the esophagus. To help relieve heartburn, a person should take medicine that is

• neutral
• basic
• 
  acidic or basic.
  
• acidic

If an acid is combined with a base of equal strength, the result will most likely be

• a neutral solution.
• a stronger acid.
• impossible to tell without testing the pH.
• a stronger base

Holly has an unknown substance in a beaker. She wants to determine the relative pH of the unknown substance. She places a piece of blue litmus paper into the substance, and the litmus paper stays blue.
The substance in the beaker

• is a base.
• has a neutral pH.
  
• is an acid.
• does not have a pH.

Which of the following is a base?

• orange juice
• water
• vinegar
• dishwashing detergent

Litmus paper can be used to determine the _______ of a substance.

• relative volume
• temperature
• relative pH
• chemical formula

Ammonia has a pH of 12.  Ammonia is __________.

• an acid
• a base
• an element
• a metal

Which statement describes an electrolyte?

• An electrolyte conducts an electric current as a

  solid and dissolves in water.

• An electrolyte conducts an electric current as a

  solid and does not dissolve in water.

• When an electrolyte dissolves in water, the

  resulting solution conducts an electric

  current.

• When an electrolyte dissolves in water, the

  the resulting solution does not conduct an electric

  current.

Which solution is the best conductor of an electric

current?

• 0.001 mole of NaCl dissolved in 1000. mL of

  water

• 0.005 mole of NaCl dissolved in 1000. mL of

  water

• 0.1 mole of NaCl dissolved in 1000. mL of

  water

• 0.05 mole of NaCl dissolved in 1000. mL of

  water

Which substance is an Arrhenius acid?

• H_2

• HCl

• KCl

• NH₃