Science Test - pH Potential of Hydrogen, Balancing Equations,

H+

Hydrogen ion or acid.

OH-

Hydroxide or base ion.

What is an example of a weak acid (pH)

A weak acid has a pH of 6.

What is an example of a weak alkali (pH)

A weak alkali has a pH of 8.

What are H+ and OH- created from?

Both H+ (acids) and OH- (bases) are created from H2O (water).

How is H+ created

H+ is created when a hydrogen atom leaves the H2O molecule and leaves behind an electron.

How is OH- created

OH- is created when the hydrogen atom leaves the H2O molecule and leaves behind an extra electron.

What colour will cabbage pH indicator turn when water is added?

Water will make cabbage pH indicator turn blue.

What colour will cabbage pH indicator turn when vinegar is added?

Vinegar will make cabbage pH indicator turn red.

What colour will cabbage pH indicator turn when baking soda is added?

Baking soda will make cabbage pH indicator turn blue.

What colour will cabbage pH indicator turn when a strong acid is added?

A strong acid will make cabbage pH indicator turn red.

What colour will cabbage pH indicator turn when a strong alkali (base) is added?

A strong alkali (strong base) will make cabbage pH indicator turn yellow.

What colour will cabbage pH indicator turn when a weak alkali (base) is added?

A weak alkali (base) will make cabbage pH indicator turn green.

What colour will cabbage pH indicator turn when a weak acid is added?

A weak acid will make cabbage pH indicator turn purple.

What colour will the cabbage pH indicator turn when vinegar and baking soda is added?

Combining vinegar and baking soda in cabbage pH indicator results in color changes red → blue → purple.

Chemical formula of Hydrogen Peroxide

Hydrogen peroxide is represented by the chemical formula H₂O₂.

What does Hydrogen Peroxide decompose into?

Hydrogen peroxide decomposes into H₂ + O₂.

How does hydrogen peroxide decompose?

Hydrogen peroxide decomposes naturally over time, sped up with light and heat.

What is the yeast in the Elephant toothpaste experiment?

In the Elephant Toothpaste experiment, yeast acts as the catalyst.

Purpose of a Catalyst

The purpose of a catalyst in a chemical reaction is to speed up the reaction time.

Dish soap purpose in experiment

The purpose of dish soap in the hydrogen peroxide experiment is to capture the oxygen.

Why does the container get warm in the Elephant Toothpaste experiment?

The container gets warm because heat is released during the chemical reaction.

pH 1

• Stomach Acid (HCl, Hydrochloric Acid)

• strong acid

• red

pH 2

• Lemon Juice

• strong acid

• reddish-purple

pH 3

• Vinegar

• strong acid

• reddish-purple

pH 4

• Tomato

• weak acid

• purple 

pH 5

• Coffee black

• weak acid

• purplish-blue

pH 6

• Milk

• weak acid

• purplish-blue

pH 7

• Water

• neutral

• blue

pH 8

• Blood

• weak base

• bluish-green

pH 9

• Baking soda

• weak base

• bluish-green

pH 10

• Tums (ant-acid)

• weak base

• green

pH 11

• Ammonia (Windex)

• strong base

• greenish yellow

pH 12

• Soap

• strong base

• greenish yellow

pH 13

• Bleach

• strong base

• greenish yellow

pH 14

• Drain Cleaner (NaOH, Sodium Hydroxide)

• strong base

• yellow