Adithya wants to classify the following changes as physical or chemical. Can you help him?
1. Melting of ice (P)
2. Ripening of fruits
3. Rusting of iron (P)
4. Spoilage of food
5. Burning of wood (ch)
6. Bursting crackers
7. Burning of camphor (ch)
| Physical Changes | Chemical Changes |
|---|---|
| | |
Answer (2)
The changes can be classified as follows: Melting of ice is a physical change, while ripening of fruits, rusting of iron, spoilage of food, burning of wood, bursting crackers, and burning of camphor are chemical changes. Understanding the differences helps in accurately categorizing these changes.
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To help Adithya classify the changes, we need to understand the difference between physical and chemical changes.
A physical change is a change in which no new substances are formed. These changes are usually reversible. Examples include changes in state, like melting or freezing, where the substance itself remains the same and simply changes form.
A chemical change involves a chemical reaction where new substances with different properties are formed. These changes are usually irreversible under normal conditions. Signs of a chemical change may include a change in color, production of gas, or formation of a precipitate.
Let's classify each change:
Melting of ice: This is a physical change. When ice melts, it changes from solid to liquid water, but the substance, H₂O, remains the same.
Ripening of fruits: This is a chemical change. As fruits ripen, complex chemical reactions occur, changing the fruit's color, texture, and taste as new substances are formed.
Rusting of iron: This is a chemical change. When iron rusts, it reacts with oxygen in the presence of water to form a new substance called iron oxide.
Spoilage of food: This is a chemical change. Spoilage involves complex chemical reactions that produce new, often harmful substances, such as bacteria or molds.
Burning of wood: This is a chemical change. Burning involves a chemical reaction with oxygen that transforms wood into ash, carbon dioxide, and water vapor, forming new substances.
Bursting crackers: This is a chemical change. When crackers burst, they undergo rapid chemical reactions producing light, sound, and gaseous products.
Burning of camphor: This is a chemical change. Camphor, when burned, undergoes a chemical reaction that transforms it into new gases and ash.
Physical Changes:
Melting of ice
Chemical Changes: 2. Ripening of fruits 3. Rusting of iron 4. Spoilage of food 5. Burning of wood 6. Bursting crackers 7. Burning of camphor
