Advertisements
Advertisements
प्रश्न
Define solvent.
उत्तर
Solvent is a liquid or a medium in which the solute is dissolved.
Example: Water
APPEARS IN
संबंधित प्रश्न
Name the processes involved in two cases.
Fill in the blank :
The state of matter with definite volume and definite shape is called______
All kinds of matter
Bromine and air take about 15 minutes to diffuse completely but bromine diffuses into a vacuum very rapidly. Why is this so?
Which type of elements, metals or non-metals, show the property of brittleness ?
One of the following substances is neither a good conductor of electricity nor an insulator. This substance is :
There are three substances X, Y and Z. The substance X does not have a fixed melting point or boiling point and it still shows the individual properties of its constituents. The substance Y is a pure substance which occurs in nature as such. The substance Y has a fixed melting point and boiling point but it cannot be broken down into simpler substances by any chemical means. The substance Z is also a pure substance whose properties are entirely different from those of its constituents. The substance Z can, however, be divided by electrolysis into two substances which belong to the same class of substances as Y.
- What type of substance could X be ? Name one substance like X.
- What type of substance could Y be ? Name one substance like Y.
- What type of substance could Z be ? Name one substance like Z.
- Which process involves absorption or release of an appreciable amount of energy : formation of substance X or formation of substance Z ?
- Name the three groups into which all the substances like Y are divided on the basis of their properties.
What is the difference between solutions and colloids ?
Which of the following are chemical changes and which physical ? Give reason.
- a glass bottle breaking
- coal burning in air
- making a cake
- wool being knitted into a sweater
How will you separate a mixture of iron filings, chalk powder and common salt ?
Describe a method for separating a mixture of iron filings and sulphur powder other than that by using a magnet.
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.
Naphthalene can be separated from sand :
There are three liquids A, B and C, all having different densities and different boiling points. Liquids A and C are organic in nature whereas liquid B is considered to be inorganic. When liquids A and B are put together in a container, they form a single layer. On the other hand, when, liquids B and C are mixed, they form two separate layers :
(a) Which process will you use to separate a mixture of A and B ?
(b) Which method will you use to separate a mixture of B and C ?
(c) Name the liquids which would behave like (i) A (ii) B and (iii) C.
Write a few lines on the blackboard with a chalk. Now observe the chalk. What changes do you see in the chalk?
Liquids cannot be compressed and they have fixed volume.
Which statement is not correct for a mixture
A teabag placed in a cup of hot water will diffuse into the water.
Solids do not flow.
Define the term matter.