Chemistry Physical & Chemical Changes Part 2 (Physical Change) Class 7 VII

TL;DR

This video explains the difference between physical and chemical changes, providing examples of physical changes and how they are reversible.

Transcript

hello friends this video on physical and chemical changes part 2 is brought to you by exam for your calm no more fear from exam now broadly there are two types of changes which we are going to discuss one is a physical change and other one is a chemical change so let's see what is physical change and what is chemical change so we will start our dis... Read More

Key Insights

• 👶 Physical changes involve alterations in the external properties of a substance without forming new chemical substances.
• 🔪 Examples of physical changes include breaking a glass, cutting paper into pieces, and chopping a log of wood.
• 💱 Physical changes are reversible and can be reverted back to the original substance.
• 💦 Mixing substances to form a solution, such as sugar and water or salt and water, is also considered a physical change.
• 👶 Chemical changes result in the formation of new chemical substances and are not reversible.
• 💱 Identifying physical changes can be done by observing changes in size, shape, appearance, or other external properties of a substance.
• 🏑 Understanding the difference between physical and chemical changes is important in various scientific fields, such as chemistry and materials science.

Questions & Answers

Q: What is the difference between physical and chemical changes?

Physical changes involve alterations in the external properties of a substance, such as size and shape, without forming new chemical substances. Chemical changes, on the other hand, result in the formation of new chemical substances.

Q: Can physical changes be reversed?

Yes, most physical changes are reversible. For example, a broken glass can be joined back together, and chopped pieces of wood can be reassembled.

Q: What are some examples of physical changes?

Some examples include cutting paper into pieces, breaking a glass, and melting ice.

Q: How can physical changes be identified?

Physical changes can be identified by observing alterations in the external properties of a substance, such as changes in size, shape, or appearance.

Summary & Key Takeaways

• Physical changes are changes in the external properties of a substance, such as color, shape, and appearance.

• Physical changes are reversible and do not result in the formation of new chemical substances.

• Examples of physical changes include breaking a glass, cutting paper into pieces, and chopping a log of wood.