Allied solutions

Allied solutions

Grade 8

Physical and Chemical Changes | Exercise

Question 10

Q10) Select the chemical changes from the following list of changes.

(a) Vaporisation of water into water vapour

(b) Boiling of milk

(c) Respiration in mammals

(d) Rotting of eggs

(e) Drying of a fruit

(f) The carbon cycle

(g) Occurrence of lightning

(h) Breaking of glass

(i) Butter turning rancid

(j) Glowing of an electric bulb

(k) Crystallization of salt from its solution

(l) Change of seasons

(m) Preparation of carbon dioxide from calcium carbonate & dilute hydrochloric acid.

Solution:

The following changes are chemical changes:

(c) Respiration in mammals - Inhalation of oxygen and exhaling carbon dioxide, which is irreversible and composition of oxygen changes.

(d) Rotting of eggs - Change in composition of the content of eggs, and it is irreversible.

(g) Occurrence of lightning - Energy is produced in this change.

(i) Butter turning rancid - The composition of butter changes in this change.

(m) Preparation of carbon dioxide from calcium carbonate & dilute hydrochloric acid - The change is permanent and irreversible, and a new substance is formed.

Still have questions? Our expert teachers can help you out

Book a free class now

Want to top your chemistry exam ?

Learn from an expert tutor.

Book a free class now
subject-cta

Question 10

Q10) Select the chemical changes from the following list of changes.

(a) Vaporisation of water into water vapour

(b) Boiling of milk

(c) Respiration in mammals

(d) Rotting of eggs

(e) Drying of a fruit

(f) The carbon cycle

(g) Occurrence of lightning

(h) Breaking of glass

(i) Butter turning rancid

(j) Glowing of an electric bulb

(k) Crystallization of salt from its solution

(l) Change of seasons

(m) Preparation of carbon dioxide from calcium carbonate & dilute hydrochloric acid.

Solution:

The following changes are chemical changes:

(c) Respiration in mammals - Inhalation of oxygen and exhaling carbon dioxide, which is irreversible and composition of oxygen changes.

(d) Rotting of eggs - Change in composition of the content of eggs, and it is irreversible.

(g) Occurrence of lightning - Energy is produced in this change.

(i) Butter turning rancid - The composition of butter changes in this change.

(m) Preparation of carbon dioxide from calcium carbonate & dilute hydrochloric acid - The change is permanent and irreversible, and a new substance is formed.

Still have questions? Our expert teachers can help you out

Book a free class now

Want to top your chemistry exam ?

Learn from an expert tutor.

Book a free class now
subject-cta
linkedin instgram facebook youtube
2020 © Quality Tutorials Pvt Ltd All rights reserved
linkedin instgram facebook youtube