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Questions and Answers
What is the phenomenon exhibited by naphthalene balls at room temperature?
What is the phenomenon exhibited by naphthalene balls at room temperature?
- Melting
- Condensation
- Sublimation (correct)
- Evaporation
Which statement correctly describes the movement of air molecules?
Which statement correctly describes the movement of air molecules?
- Air molecules move slowly with large intermolecular spaces.
- Air molecules move quickly with small intermolecular spaces.
- Air molecules move at a higher speed with large intermolecular spaces. (correct)
- Air molecules move slowly with small intermolecular spaces.
Why can we smell perfumes several meters away?
Why can we smell perfumes several meters away?
- Perfumes contain solid particles that travel far in the air.
- Perfumes are heavy and settle close to the ground.
- Perfumes are light and evaporate quickly into the air. (correct)
- Perfumes become thicker as they spread in the air.
In terms of forces of attraction between particles, arrange the following in increasing order: water, sugar, oxygen.
In terms of forces of attraction between particles, arrange the following in increasing order: water, sugar, oxygen.
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What is the physical state of water at 250°C?
What is the physical state of water at 250°C?
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Why does the temperature remain constant during a change of state?
Why does the temperature remain constant during a change of state?
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How can one liquify atmospheric gases?
How can one liquify atmospheric gases?
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What occurs to the water kept in an earthen pot (matka) during summer?
What occurs to the water kept in an earthen pot (matka) during summer?
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What role does latent heat play in the change of state of matter?
What role does latent heat play in the change of state of matter?
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What effect does increasing pressure have on gases?
What effect does increasing pressure have on gases?
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