Question 11

State whether the following statements are true or false:

(a) When a candle burns, both physical and chemical changes take place.
(b) Anaerobic bacteria digest animal waste and produce biogas.
(c) Ships suffer a lot of damage though they are painted.
(d) Stretching of rubber band is not a physical change.

Open in App

Solution

(a) True, the wax meting is a physical process, while combustion of wax is chemical process,
(b) True
(c) True, salty water of sea causes faster rusting of iron.
(d) False, stretching of rubber band is a physical change

Suggest Corrections

Similar questions

Anaerobic bacteria digest animal wastes and produces biogas (change=A) . The biogas is then burnt as fuel (change=B) . The following stamens pretain to these changes . Choose the correct one :

(a) A is a chemical change (b) B is a chemical change

(d) A and B are physical changes.

Q. State whether the given statement is True or False
When we burn a candle, both physical and chemical changes occur.

Anaerobic bacteria digest animal waste and produce biogas (Change − A).

The biogas is then burnt as fuel (Change − B). The following statements pertain to these changes. Choose the correct one.

(i) Process − A is a chemical change.

(ii) Process − B is a chemical change.

(iii) Both processes A and B are chemical changes.

(iv) None of these processes is a chemical change.

Q. Question 12
Anaerobic bacteria digest animal waste and produce biogas (Change –A). The biogas is then burnt as fuel (Change –B). The following statements pertain to these changes. Choose the correct one.
Which of the above changes is/are chemical change(s)?
(i) Process – A is a chemical change.
(ii) Process – B is a chemical change.
(iii) Both processes A and B are chemical changes.
(iv) None of these processes is a chemical change

Q. Question 5
When a candle burns, both physical and chemical changes take place. Identify these changes. Give another example of a familiar process in which both the chemical and physical changes take place.

Join BYJU'S Learning Program

Explore more

Physical Change

Standard VII Chemistry

Join BYJU'S Learning Program

(a) True, the wax meting is a physical process, while combustion of wax is chemical process, (b) True (c) True, salty water of sea causes faster rusting of iron. (d) False, stretching of rubber band is a physical change

(a) True, the wax meting is a physical process, while combustion of wax is chemical process,
(b) True
(c) True, salty water of sea causes faster rusting of iron.
(d) False, stretching of rubber band is a physical change