U1-3-0 - N4 Revision

Question 1

What is a pH scale?

Answer 1

A measure of the hydrogen ion concentration in a solution.

Low pH = high concentration

Question 2

Acidic solutions have pH…

Answer 2

less than 7.

Question 3

Alkaline solutions have pH…

Answer 3

more than 7.

Question 4

Neutral solutions have pH…

Answer 4

equal to 7.

Question 5

Base

Answer 5

A substance which can neutralise an acid

Question 6

Acid

Answer 6

Substance which contains hydrogen ions (H⁺)

Question 7

Alkali

Answer 7

Soluble base

Question 8

Sodium chloride is a salt.

Where does the ‘sodium’ part come from?

Answer 8

Parent base

(sodium oxide, hydroxide or carbonate)

Question 9

Sodium chloride is a salt.

Where does the ‘chloride’ part come from?

Answer 9

Parent acid

(hydrochloric acid)

Question 10

Phosphoric acid makes …. salts.

Answer 10

phosphate

Question 11

Sulfuric acid makes …. salts.

Answer 11

sulfate

Question 12

Colour of universal indicator in acid

Answer 12

Red

(red/orange/yellow)

Question 13

Colour of universal indicator in alkalis

Answer 13

Blue/purple

Question 14

Colour of universal indicator in neutral solutions

Answer 14

Green