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- 1. Multiple Choice
When a crystal of potassium permanganate is placed in a beaker containing water, its purple colour spreads throughout the water. What do you conclude from this observation about the nature of potassium permanganate and water? What is the first statement of the audio clip?
When we place few crystals of potassium permanganate in a beaker containing water, we get two distinct layers-colourless water at the top and pink colour at the bottom.
After few minutes, pink colour spreads and whole solution turns pink due to diffusion
Since potassium permanganate is a solid substance, it does not possess so much space.
Water molecules due to liquid state, collide with solid particles and intermix due to sufficient space between molecules.
- 2. Multiple Choice
When a crystal of potassium permanganate is placed in a beaker containing water, its purple colour spreads throughout the water. What do you conclude from this observation about the nature of potassium permanganate and water? What is the second statement of the audio clip?
When we place few crystals of potassium permanganate in a beaker containing water, we get two distinct layers-colourless water at the top and pink colour at the bottom.
After few minutes, pink colour spreads and whole solution turns pink due to diffusion
Since potassium permanganate is a solid substance, it does not possess so much space.
Water molecules due to liquid state, collide with solid particles and intermix due to sufficient space between molecules.
- 3. Multiple Choice
When a crystal of potassium permanganate is placed in a beaker containing water, its purple colour spreads throughout the water. What do you conclude from this observation about the nature of potassium permanganate and water? What is the Third statement of the audio clip?
When we place few crystals of potassium permanganate in a beaker containing water, we get two distinct layers-colourless water at the top and pink colour at the bottom.
After few minutes, pink colour spreads and whole solution turns pink due to diffusion
Since potassium permanganate is a solid substance, it does not possess so much space.
Water molecules due to liquid state, collide with solid particles and intermix due to sufficient space between molecules.
- 4. Multiple Choice
When a crystal of potassium permanganate is placed in a beaker containing water, its purple colour spreads throughout the water. What do you conclude from this observation about the nature of potassium permanganate and water? What is the fourth statement of the audio clip?
When we place few crystals of potassium permanganate in a beaker containing water, we get two distinct layers-colourless water at the top and pink colour at the bottom.
After few minutes, pink colour spreads and whole solution turns pink due to diffusion
Since potassium permanganate is a solid substance, it does not possess so much space.
Water molecules due to liquid state, collide with solid particles and intermix due to sufficient space between molecules.
- 5. Multiple Choice
Why do solids have a regular geometrical shape? What is the first statement of the audio clip?
In solids, the particles have highly ordered arrangement
t because the intermolecular forces between the particles are very strong.
Therefore, solids have a regular geometrical shape.
- 6. Multiple Choice
Why do solids have a regular geometrical shape? What is the second statement of the audio clip?
In solids, the particles have highly ordered arrangement
t because the intermolecular forces between the particles are very strong.
Therefore, solids have a regular geometrical shape.
- 7. Multiple Choice
Why do solids have a regular geometrical shape? What is the third statement of the audio clip?
In solids, the particles have highly ordered arrangement
t because the intermolecular forces between the particles are very strong.
Therefore, solids have a regular geometrical shape.
- 8. Multiple Choice
Why are gases compressible but not liquids? What is the first statement of the audio clip?
Gases are compressible because the intermolecular space is very large in gases,
whereas liquids are not compressible because in liquids,
the intermolecular space is less
- 9. Multiple Choice
Why are gases compressible but not liquids? What is the second statement of the audio clip?
Gases are compressible because the intermolecular space is very large in gases,
whereas liquids are not compressible because in liquids,
the intermolecular space is less
- 10. Multiple Choice
Why are gases compressible but not liquids? What is the third statement of the audio clip?
Gases are compressible because the intermolecular space is very large in gases,
whereas liquids are not compressible because in liquids,
the intermolecular space is less
- 11. Multiple Choice
Can a rubber band change its shape on stretching? Is it solid? What is the first statement of the audio clip?
Yes, a rubber band changes shape under force
and regains the same shape when removed.
It breaks by applying excessive force.
Yes, it is a solid.
- 12. Multiple Choice
Can a rubber band change its shape on stretching? Is it solid? What is the second statement of the audio clip?
Yes, a rubber band changes shape under force
and regains the same shape when removed.
It breaks by applying excessive force.
Yes, it is a solid.
- 13. Multiple Choice
Can a rubber band change its shape on stretching? Is it solid? What is the Third statement of the audio clip?
Yes, a rubber band changes shape under force
and regains the same shape when removed.
It breaks by applying excessive force.
Yes, it is a solid.
- 14. Multiple Choice
Can a rubber band change its shape on stretching? Is it solid? What is the Fourth statement of the audio clip?
Yes, a rubber band changes shape under force
and regains the same shape when removed.
It breaks by applying excessive force.
Yes, it is solid.
- 15. Multiple Choice
Why steam at 100°C is better for heating purposes than water at 100°C? What is the first statement of the audio clip?
. Steam at 100°C is better for heating purposes than water at 100°C
because the energy of 1 steam at 100°C is 22.6 × 100 Joule
which is more than that of 1 kg of water at the temperature.
- 16. Multiple Choice
Why steam at 100°C is better for heating purposes than water at 100°C? What is the Second statement of the audio clip?
. Steam at 100°C is better for heating purposes than water at 100°C
because the energy of 1 steam at 100°C is 22.6 × 100 Joule
which is more than that of 1 kg of water at the temperature.
- 17. Multiple Choice
Why steam at 100°C is better for heating purposes than water at 100°C? What is the Third statement of the audio clip?
. Steam at 100°C is better for heating purposes than water at 100°C
because the energy of 1 steam at 100°C is 22.6 × 100 Joule
which is more than that of 1 kg of water at the temperature.
- 18. Multiple Choice
Give ways in which melting points and boiling points can be useful? What is the first statement of the audio clip?
A melting point can be used to get an indication of compound or
elements’ purity. A wide melting point range usually indicates that a substance is impure. If the compound melts over a very narrow range, it can usually be assumed that the compound is relatively pure.
Knowing the melting point of a chemical is very important for its storage & transport.
melting point is often used to predict the partition behavior of a chemical between solid and gas phases. A higher melting point indicates greater intermolecular forces and therefore less vapor pressure.
To identify and singularize the substance
- 19. Multiple Choice
Give ways in which melting points and boiling points can be useful? What is the Second statement of the audio clip?
A melting point can be used to get an indication of compound or
elements’ purity. A wide melting point range usually indicates that a substance is impure. If the compound melts over a very narrow range, it can usually be assumed that the compound is relatively pure.
Knowing the melting point of a chemical is very important for its storage & transport.
melting point is often used to predict the partition behavior of a chemical between solid and gas phases. A higher melting point indicates greater intermolecular forces and therefore less vapor pressure.
To identify and singularize the substance
- 20. Multiple Choice
Give ways in which melting points and boiling points can be useful? What is the Third statement of the audio clip?
A melting point can be used to get an indication of compound or
elements’ purity. A wide melting point range usually indicates that a substance is impure. If the compound melts over a very narrow range, it can usually be assumed that the compound is relatively pure.
Knowing the melting point of a chemical is very important for its storage & transport.
melting point is often used to predict the partition behavior of a chemical between solid and gas phases. A higher melting point indicates greater intermolecular forces and therefore less vapor pressure.
To identify and characterise the substance
- 21. Multiple Choice
Give ways in which melting points and boiling points can be useful? What is the Fourth statement of the audio clip?
A melting point can be used to get an indication of compound or
elements’ purity. A wide melting point range usually indicates that a substance is impure. If the compound melts over a very narrow range, it can usually be assumed that the compound is relatively pure.
Knowing the melting point of a chemical is very important for its storage & transport.
melting point is often used to predict the partition behavior of a chemical between solid and gas phases. A higher melting point indicates greater intermolecular forces and therefore less vapor pressure.
To identify and characterise the substance
- 22. Multiple Choice
Alka was making tea in a kettle. Suddenly she felt intense heat from the puff of steam gushing out of the spout of the kettle. She wondered whether the temperature of the steam was higher than that of the water boiling in the kettle. Comment What is the first inference from the video clip?
The temperature of both boiling water and steam is 100° C,
but steam has more energy because of latent heat of vaporisation.
- 23. Multiple Choice
Alka was making tea in a kettle. Suddenly she felt intense heat from the puff of steam gushing out of the spout of the kettle. She wondered whether the temperature of the steam was higher than that of the water boiling in the kettle. Comment What is the second inference from the video clip?
The temperature of both boiling water and steam is 100° C,
but steam has more energy because of latent heat of vaporisation.
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