5
Question
Match the substances in Column I with their applications given in Column II.
Column 1 Column 2
Crushing of an ice cube
Rust
Making of curd from milk
Physical change
Plants making their food in the presence of sunlight
Chemical change
Color of coating appearing on silver when it is exposed to atmosphere
Photosynthesis
Brown coating appears on iron when it is exposed to air and moisture
Black
Match the substances in Column I with their applications given in Column II.
| Column 1 | Column 2 |
|---|---|
Crushing of an ice cube |
Rust |
Making of curd from milk |
Physical change |
Plants making their food in the presence of sunlight |
Chemical change |
Color of coating appearing on silver when it is exposed to atmosphere |
Photosynthesis |
Brown coating appears on iron when it is exposed to air and moisture |
Black |
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Solution
(A) Crushing of an ice cube - (II) Physical change
- A change in which no new substance is formed is called a physical change. Because only the condition of ice changes, not the chemical formula.
It may also be reversed, which means it can be turned back into ice.
(B) Making of curd from milk - (III) Chemical change
- A change in which a new substance is formed is called a chemical change. Curd setting is a chemical alteration that occurs when a new material (lactic acid) is created. The curd that results has a distinct flavour from the original material. Furthermore, once the curd has been created, milk cannot be extracted from it. It's a change that can't be reversed.
(C) Plants making their food in the presence of sunlight - (IV) Photosynthesis
- Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to create oxygen and energy in the form of sugar.
(D) Color of coating appearing on silver when it is exposed to the atmosphere - (V) Black
- The silver article becomes black after when exposed to air and leaving for time being.
(E) Brown coating appearing on iron when it is exposed to air and moisture - (I) Rust
- Rust is made up of hydrated ferric oxide, which has the chemical formula Fe2O3.xH2O. Rust is the general term for iron oxide, a highly common chemical. Because iron is so easily combined with oxygen, iron oxide, or Fe2O3, is abundant. In fact, pure iron is rare in nature.
COLUMN I COLUMN II (A) Crushing of an ice cube (II) Physical change (B) Making of curd from milk (III) Chemical change (C) Plants making their food in the presence of sunlight (IV) Photosynthesis (D) Color of coating appearing on silver when it is exposed to atmosphere (V) Black (E) Brown coating appears on iron when it is exposed to air and moisture (I) Rust
(A) Crushing of an ice cube - (II) Physical change
- A change in which no new substance is formed is called a physical change. Because only the condition of ice changes, not the chemical formula.
It may also be reversed, which means it can be turned back into ice.
(B) Making of curd from milk - (III) Chemical change
- A change in which a new substance is formed is called a chemical change. Curd setting is a chemical alteration that occurs when a new material (lactic acid) is created. The curd that results has a distinct flavour from the original material. Furthermore, once the curd has been created, milk cannot be extracted from it. It's a change that can't be reversed.
(C) Plants making their food in the presence of sunlight - (IV) Photosynthesis
- Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to create oxygen and energy in the form of sugar.
(D) Color of coating appearing on silver when it is exposed to the atmosphere - (V) Black
- The silver article becomes black after when exposed to air and leaving for time being.
(E) Brown coating appearing on iron when it is exposed to air and moisture - (I) Rust
- Rust is made up of hydrated ferric oxide, which has the chemical formula Fe2O3.xH2O. Rust is the general term for iron oxide, a highly common chemical. Because iron is so easily combined with oxygen, iron oxide, or Fe2O3, is abundant. In fact, pure iron is rare in nature.
| COLUMN I | COLUMN II | ||
|---|---|---|---|
| (A) | Crushing of an ice cube | (II) | Physical change |
| (B) | Making of curd from milk | (III) | Chemical change |
| (C) | Plants making their food in the presence of sunlight | (IV) | Photosynthesis |
| (D) | Color of coating appearing on silver when it is exposed to atmosphere | (V) | Black |
| (E) | Brown coating appears on iron when it is exposed to air and moisture | (I) | Rust |
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