III. For example: freezing water to make ice. Ans. The ultimate stage of land degradation is irreversible, as the soil becomes sterile and can no longer support the growth of plants. When Ice melts to form water, change occurs In its (a) position (b) colour (c) state (d) composition Answer: (c) state. All changes in the world are one of the two types – Reversible changes and irreversible changes. 2. Bubbles are formed in process 1 while no bubble formation takes place in process 2. The chemical equation for a combustion reaction is:. When this occurs, the environment becomes prone to soil erosion, water becomes scarce, fauna and flora disappear, and natural resources become limited, resulting in conflicts, migration, famine, and poverty. 1. Reversible and Irreversible Changes Involving Same Materials Even the same material can undergo reversible change or irreversible change under different set of conditions. Fuel + O 2 → CO 2 + H 2 O. Combustion occurs whenever a fuel burns. Classify the following changes as reversible or irreversible: (i) the breaking of a glass tumbler (ii) cooking of rice (iii) melting of Wax iv) germination of seeds (v) ploughing of a field vi) stretching of a rubber band. It is reversible change. Both reversible and irreversible processes are initiated when low carbon number (i.e., volatile), water‐soluble organic gases partition to aerosol water or cloud/fog droplets. (a) Irreversible change (b) Reversible change (c) Sawing of a piece of wood (d) Ripening of mango (e) Melting of wax (f) Formation of a sugar solution (vi) No new substance is formed (iv) A new substance is formed (v) Physical change (i) Needs mixing of two substances (ii) Needs heating (iii) Chemical change 2. Question 3. Reversible changes and Irreversible changes. Taste and color will change. 7. in forward and in backward direction so we conclude that this reaction is reversible in nature, and it can be represented as: N 2 (g) +3H 2 (g) 2NH 3 (g) 2) Dehydration of hydrated salt of copper sulphate is also an example of reversible reaction. Process 1 is slow while process 2 is fast. Reversible change: Irreversible change done clear. Ans: 1. Shape and size will change. Question 2. Thus, the burning of an incense stick is an irreversible change. It is an Irreversible change. Folding of Paper and Cutting of Paper Take a sheet of paper and fold it to form a toy aeroplane. A change which can happen backward, that is, can be reversed is called a reversible change. This water again comes back to the earth by precipitation. II. If you keep water in … Now because the reaction is taking place in both the directions i.e. A change which cannot be reversed to form the original substance is known as an irreversible change. 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