Acids and Bases

Which has a pH below 7?

• Acid
• Base

Which has a pH above 7?

• Acid
• Base

Which has a bitter taste?

• Base
• Acid
• flagella
• cila

Which of the following statements about acids is true?

• They taste sweet.
• They taste sour.
• They have a pH between 8-14.

A solution with a pH of 7 is________

• increasing
• neutral
• decreasing
• apple juice

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

Which food is the most acidic?

• bananas
• lemon juice
• orange juice

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

Tags

NGSS.MS-PS1-2

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 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.