which of the following are physical changes and which are chemical change making a table from wood, burning wood, breaking of a glass object, ripening of a tomato, rusting of iron?
Answers
Answer:
Physical change --
- breaking of a glass object
- making a table from wood (because only physical property of wood is changed and no new substance is formed. the properties of wood remains the same. )
Chemical change --
- burning wood
- ripening of tomato
- rusting of iron
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Answer: During a physical change, matter's shape or appearance changes, but the substance's composition does not. Contrarily, a chemical change causes the development of at least one new compound with new properties.
Explanation:
Understanding the distinction between chemical and physical changes is crucial. Although there are many evident changes, there are some essential ideas to be aware of.
1. Chemical changes take place at the molecular level when two or more molecules interact. Look for signs that a chemical change has occurred.
Ripening of a tomato: Change cannot be undone.
Rusting of iron: Colour changes and it occurs due to chemical reaction.
Burning wood: Precipitation is formed.
The following signs of a chemical changes include:
- A gas is produced. Liquids can contain bubbles.
- A smell is produced.
- The substance's colour changes.
- Sound is produced.
- The temperature is fluctuating. Either the environment warms up or cools down.
- Light is produced.
- Precipitation forms.
- The change cannot or will not be undone.
2. Physical changes can be caused by forces such as motion, temperature, and pressure. Physical alterations typically relate to modifications to an object's physical state.
Making a table from wood: It is made through force and it can be undone.
Breaking of a glass object: only physical change has occured. It is not changed on its molecular level.
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