Acid-Base Reactions

At what pH is a solution neutral?

• 0

• 7

• 14

NaOH may be found in drain cleaners and as a component of soaps. Is NaOH an acid or a base?

• Acid

• Base

• Neither (Neutral)

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.

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.

Tags

NGSS.MS-PS1-2

Which of the following is an acid?

• shampoo

• baking soda

• orange juice

• water

The pH of a solution is tested, and it is found to be a basic solution. Of the following choices, what could the pH have been?

• 3

• 9

• 7

• 5

Many cleaning solutions are bases. Which of the following is a property of most bases?

• feels slippery

• white color

• can only be liquid

• tastes sour

When dissolved in water, acids produce:

• bases

• salts

• hydrogen ions

• hydroxide ions

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

Which of the following models best demonstrates a balanced chemical equation?

• F

• G

• H

• J

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following describes a precipitate?

• a liquid forms when a block of metal is heated

• a solid forms when one liquid is poured into another

• a gas forms when a solid is placed in a liquid

• bubbles form when an acid is poured on a rock

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5