Acid and Alkali

If indicator paper is red, the pH of the substance being tested is acidic.

• sometimes

• true

• false

• not at all

An acid-alkali __________________ tells us whether we have an acid or a base.

• reaction

• mixture

• indicator

• molecule

What can we use to show us that a chemical reaction is taking place?

• a speedometer

• an indicator

• a bowl of water

• a telescope

You can determine the concentration of acids or alkali in a solution by using

• the pH scale

• a salt

• the periodic table of elements

• a particle accelerator

Soap turns green in red cabbage indicator, so it is considered a(n)

• an acid

• an alkali

• neutral

• strong alkali

If something contains a hydroxide ion, it most likely is considered to be......

• an acid

• an alkali

• neutral

• all of the above

a liquid with a pH 10 is .............

• an acid

• an alkali

• neutral

• all of the above

A substance that changes color when exposed to acid or alkali solutions is called a(n) _____________.

• salt

• indicator

• molecule

• ion

Which item is not an acid?

• mustard

• lemon juice

• sugar

• tomato juice

Why is water considered to be neutral?

• Because the concentration of hydrogen ions is more than the concentration of hydroxide ions

• Because the concentration of hydrogen ions is exactly equal to the concentration of hydroxide ions

• Because the concentration of hydrogen ions is less than the concentration of hydroxide ions

• Because water does not have any hydroxide ions