Write P if it describes Physical Change and C if it describes Chemical Change. 1. Hot bottle cracking when placed in cold water. 2. Digesting food 3. Frying chicken 4. Boiling water for soup 5. Rusting of iron 6. Crumpling of paper 7. Rotting meat 8. Burning of wood 9. Rusts 10. Chopping of fruits
Answer (1)
To categorize each change as either a physical change or a chemical change, let's understand the basic definitions:
Physical Change: This is a change where no new substances are formed. These changes are often reversible. Examples include changes in state, shape, or size.
Chemical Change: This involves a transformation that leads to the formation of new substances. These changes are usually irreversible. Signs of a chemical change can include color change, gas production, and temperature change.
Now, let's categorize each scenario:
Hot bottle cracking when placed in cold water: This is a Physical Change (P) . The cracking is due to thermal stress, which does not create new substances.
Digesting food: This is a Chemical Change (C) . The food is broken down into different substances by the digestive process.
Frying chicken: This is a Chemical Change (C) . Cooking alters the chemical composition of the chicken.
Boiling water for soup: This is typically considered a Physical Change (P) . Water changes from liquid to gas, but its chemical structure remains H₂O.
Rusting of iron: This is a Chemical Change (C) . Iron reacts with oxygen to form a new substance, iron oxide (rust).
Crumpling of paper: This is a Physical Change (P) . The paper changes shape, but no new chemical substances are formed.
Rotting meat: This is a Chemical Change (C) . Decomposition involves the formation of new substances.
Burning of wood: This is a Chemical Change (C) . Combustion results in new substances like ash, water vapor, and carbon dioxide.
Rusts: This is a Chemical Change (C) . As with rusting iron, rusting forms new chemical compounds.
Chopping of fruits: This is a Physical Change (P) . The fruit is only being divided into smaller pieces, retaining its chemical identity.
