Chemical And Physical Changes Jamb Chemistry Past Questions
Question 1
A difference between chemical and physical change is that in a chemical change
- A. oxygen is consumed
- B. heat is supplied
- C. the reversible process occurs
- D. a new substance is formed
Question 2
The dissolution of common salt in water is a physical change because
- A. the salt can be obtained by crystallization
- B. the salt can be recovered by the evaporation of water
- C. heat is not generated during mixing
- D. the solution will not boil at 100oC
Question 3
Which of the following is an example of a chemical change?
- A. dissolution of salt in water
- B. rusting of iron
- C. melting of ice
- D. separating a mixture by distillation
Question 4
Which of the following are chemical changes?
I. cooking of food
II. digestion of food
III. freezing of water
IV. water is heated up
- A. cooking of food
- B. I and II
- C. I, II, and III
- D. III and IV
- E. all of the above
Question 5
Which of the following is a non-metal that remains liquid at room temperature?
- A. Chlorine
- B. Phosphorus
- C. Bromine
- D. Helium
