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प्रश्न
What are molecules ?
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उत्तर
Molecules are made of atoms. Molecules exhibit the properties of that kind of matter and has independent exi stance.
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संबंधित प्रश्न
Match the following
| Column A | Column B | ||
| (a) | Molecules | (i) | Water boils |
| (b) | 100° C | (ii) | Evaporation |
| (c) | 0° C | (iii) | Changes from solid to gas |
| (d) | At all temperatures | (iv) | Matter |
| (e) | Camphor | (v) | Water freezes |
Solids have definite shape and definite volume.
Define the following term of Matter .
Define matter. Give four examples of matter.
What is Brownian motion? Draw a diagram to show the movement of a particle (like a pollen grain during Brownian motion.
Explain why, osmosis can be considered to be a special kind of diffusion. Classify the following into
(i) osmosis, and (ii) diffusion :
- swelling up of a raisin on keeping in water
- spreading of virus on sneezing
- earthworm dying on coming in contact with common salt
- shrinking of grapes kept in thick sugar syrup
- preserving of pickles in salt
- spreading of smell of cake being baked in the kitchen
- aquatic animals using oxygen dissolved in water during respiration
“Is malleable and ductile” best describes :
Which of the following statements are true for pure substances ?
- pure substances contain only one kind of particles
- pure substances may be compounds or mixtures
- pure substances have the same composition throughout
- pure substances can be exemplified by all elements other than nickel
Which of the following is a sol ?
Shaving cream, Milk, Fog, Soap solution, Hairspray
In what respects does a true solution differ from a colloidal solution ?
Name the process by which common salt is purified.
Which technique is used in a washing machine to squeeze out water from wet clothes while drying ?
How is the impurity of iron present in several substances removed in industries ?
How will you separate a mixture of iron filings, chalk powder and common salt ?
How is cream separated from milk ?
Intermolecular space is maximum in ______.
The pressure of gases does not depend on the temperature of the gas and the volume it occupies.
Gases do not diffuse very easily.
Give an example of a molecule.
Define the term matter.
