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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
The inter-molecular space is maximum in
Name the terms for the particles of matter which may or may not have independent existence.
Fill in the blank
Any matter which has a definite _______ but no definite shape is called a _______
The three important metalloids are.............................. and ..........................
Fill in the following blanks with suitable words :
The elements which are sonorous are called ..........................
Name a metal which forms amalgams.
What is meant by (i) elements (ii) compounds, and (iii) mixtures ?Write down the names of two elements, two compounds and two mixtures.
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
Fill in the following blank :
Milk is a .................... solution but vinegar is a .................... solution.
Classify the following into solutions, suspensions and colloids :
Soda-water, Milk, Brine, Blood, Ink, Smoke in air, Chalk water mixture, Milk of Magnesia, Shaving cream, Muddy river water.
When the solid A is added to water, it dissolves with the evolution of a lot of heat and making little explosions to form two products B and C. The properties of products B and C are entirely different from those of solid A as well as water. Moreover, products B and C cannot be reconverted into solid A and water. When another solid D is added to water, it dissolves with the absorption of a little heat to form a product E which cools down. The product E shows the properties of both, solid D as well as water. Moreover, product E can be converted into solid D and water.
(a) What type of change occurs when solid A is dissolved in water ? Why ?
(b) What type of change occurs when solid D is dissolved in water ? Why ?
(c) Name a metal which you think could behave like solid A. Also name the products B and C.
(d) Name the solid D if it is the one which is used in making ordinary dry cells.
(e) Name the process by which D can be recovered from E.
What is the general name of the process by which tea-leaves are separated from prepared tea ?
What difference in the properties of oil and water enable their separation by a separating funnel ?
With the help of a labelled diagram, describe the method of separating ammonium chloride from a mixture of ammonium chloride and common salt. Mention the difference in the properties of ammonium chloride and sodium chloride which has made this separation possible.
Which one of the following scrap metal cannot be separated by magnetic separation ?
What difference in the properties of common salt and sand would enable you to separate a mixture of these two substances ?
Asmita went to buy an earthen pot. There she saw many things kept for sale.
How did she identify what she needed?
A standard sheet of paper is about ______ of atoms thick
Solids possess very high kinetic energy.
Higher the temperature, the higher the kinetic energy of particles.
