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प्रश्न
Fill in the following blank with suitable words :
The best evidence that the particles of matter are constantly moving comes from the studies of ................. and ...................
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उत्तर
The best evidence of the particles of matter are constantly moving comes from the studies of diffusion and Brownian motion.
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संबंधित प्रश्न
Intermolecular space is maximum in .......... less in ............ and the least in .........
Out of solids, liquids and gases, which one has :
- maximum movement of particles ?
- maximum interparticle attractions ?
- minimum spaces between particles ?
When a crystal of potassium permanganate is placed in a beaker, its purple colour spreads throughout the water. What does this observation tell us about the nature of potassium permanganate and water?
Honey is more viscous than water. Can you suggest why?
Name one element, one compound and one mixture.
“Is malleable and ductile” best describes :
The elements which normally exist in the liquid state are :
Iron powder and sulphur powder were mixed together and divided into two parts A and B. When part A was heated strongly over a burner, then a substance C was formed. The part B was, however, not heated at all. When dilute hydrochloric acid was added to substance C, then gas D was evolved and when dilute hydrochloric acid was added to part B then gas E was evolved.
- What type of substance is B ?
- What type of substance is C ?
- Name the gas (i) D, and (ii) E ?
- State one characteristic property of gas D.
- Write one test to identify gas E.
What happens when the temperature of a saturated sugar solution is increased ?
Define solvent.
What is meant by the concentration of a solution ?
Which one of the following is not a chemical change ?
Which of the following can be called a suspension ?
How will you separate a mixture containing sand and sugar ?
How would you separate iodine from a mixture of iodine and common salt ?
How will you separate water from mustard oil ?
Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.
Name a non-metal which exists as a liquid at room temperature.
The movement of particles in liquids is ______.
The phenomenon of Evaporation takes place at the ______ of a liquid.
Define the term matter.
