Grade 9

Acids react with

• water to produce bases and salts
• salts to produce bases and water
• neither bases, salts nor water
• bases to produce salts and water

A substance is found to have the following characteristics:

Very bitter taste

Feels slippery to the touch

Produces OH- ions when dissolved in water

In what category would the substance be classified?

• acid

• base

• enzyme

• fatty acid

HCL is...

• an acid

• a base

• a salt

• an ionic compound

Releases hydrogen in an aqueous solution.

• base
• strong base
• acid
• weak base

KOH is ...

• an acid

• a base

• a salt

• an ionic compound

The pH of a solution is 2.0. What is the [OH^-] concentration?

• 1x10^-12M

• 12 M

• 1x10^-2M

• 2 M

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 completely ionizes in solution?

• Weak acids

• Strong acids

• Strong Salts

• Neutral salts

What is an acid?

• a chemical substance that neutralizes alkalis, dissolves some metals, and turns litmus paper red
• Has a pH of 11
• Has a pH of 7

What is a base?

• Has a pH of 3
• Has a pH of 7
• substances that are slippery to the touch; turns red litmus paper blue