C2.1 - Acids and Alkalis Revision

Substances can be classified into ________, ________, and ________ solutions.

• acidic, alkaline, neutral

• solid, liquid, gas

• metallic, non-metallic, metalloid

• organic, inorganic, synthetic

The pH scale, from 0 to 14, is a measure of the ________ or ________ of a solution.

• acidity, alkalinity

• density, viscosity

• temperature, pressure

• solubility, concentration

Acids and alkalis can be ________ or ________.

• strong, weak

• hot, cold

• solid, liquid

• sweet, sour

Weak acids have a ________ taste and are not harmful to the touch.

• sour

• sweet

• bitter

• salty

The pH scale can be measured using which of the following?

• Litmus

• Universal indicator

• pH probe

• All of the above

A solution with pH 7 is ________.

• neutral

• acidic

• basic

• alkaline

Aqueous solutions of acids have pH values of less than ________.

• 7

• 9

• 12

• 14

Aqueous solutions of alkalis have pH values greater than ________.

• 7

• 5

• 3

• 0

Between pH 8 and pH 14, the higher the pH the stronger the ________.

• alkali

• acid

• salt

• base metal

Between pH 8 and pH 14, the lower the pH the weaker the ________.

• alkali

• acid

• base

• solution