Acids and Alkalis

The most commonly used natural indicator is _______.

Which of the following is NOT an example of an acid?

• Grapefruit juice

• Sour milk

• Window cleaner

• Vinegar

What pH is lemon juice likely to have?

• pH1

• pH5

• pH7

• pH9

In an experiment to find out which liquids are acids or alkalis, the responding variable is the:

• height of the fizz

• amount of liquid

• size of containers

• type of liquid

On a pH scale, neutral substances have a value of _______.

Alkalis turn litmus paper _______, while acids turn litmus paper _______.

The science teacher gave Bre a small amount of clear liquid in a test tube. Bre thinks it is an acid. Which of the following observations would BEST prove Bre's hypothesis? The liquid

• has no effect on blue litmus paper

• turns blue litmus red

• has no effect on red litmus paper

• turns red litmus blue

When tested with both blue and red litmus Bre found that the liquid turned red litmus blue but had no effect on blue litmus. The liquid was most likely to be a/an

• acid

• alkali

• neutral substance

• poison

Baking soda is a/an _______ which turns red litmus blue.

A substance which is neither acid nor alkali is said to be _______.