Here are the solutions to the questions from the image: 5. ii) Mass number 6. The table below shows the pH of four solutions: P-2.0, Q-12.0, R-7.0, S-5.0. 6. a) Identify the following: i) Strongly aci

Here are the solutions to the questions from the image:

5. ii) Mass number
The mass number refers to the total number of protons and neutrons in the nucleus of an atom.

6. The table below shows the pH of four solutions:

Solution	pH
P	2.0
Q	12.0
R	7.0
S	5.0

6. a) Identify the following:

• i) Strongly acidic solution A strongly acidic solution has a low pH value. $$\boxed{P}$$
• ii) Strongly basic solution A strongly basic solution has a high pH value. $$\boxed{Q}$$
• iii) Neutral solution A neutral solution has a pH of 7. $$\boxed{R}$$

6. b) State ONE use of acids and ONE use of bases in daily life.

• Use of acid: Hydrochloric acid is present in the stomach to aid in the digestion of food.
• Use of base: Sodium hydroxide (caustic soda) is used in the manufacture of soap and detergents.

7. a) Define isotopes.
Isotopes are atoms of the same element that have the same number of protons (atomic number) but different numbers of neutrons, leading to different mass numbers.