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प्रश्न
What is meant by a substance?
उत्तर
- A substance is one that is composed of only one type of atom or molecule.
- A substance might be an element or a compound; for example, water has only one type of particle, so it is a material.
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संबंधित प्रश्न
What is a mixture ? Give two example of mixtures.
The ‘sea water’ can be classified as a homogeneous mixture as well as a heterogeneous mixture ? Comment.
Three mixtures A, B and C are obtained by stirring three different solids in water taken in separate beakers. When mixture A is allowed to stand for some time, then its particles settle at the bottom of the beaker. When a beam of light is passed through mixture A in a dark room, the path of light becomes visible when observed from the side of the beaker. When mixture B is allowed to stand for a considerable time, even then its particles do not settle down. Mixture B, however, scatters the beam of light just like mixture A. The particles of mixture C do not settle down on keeping and it also does not scatter a beam of light passing through it.
What are the mixtures like A known as ?
What are the mixtures like B known as ?
What are the mixtures like C known as ?
Name the phenomenon exhibited by A and B which occurs on passing a beam of light through them.
Name one mixture each which is like (i) A (ii) B, and (iii) C.
Name the solvent you would use to separate a mixture of sulphur and carbon.
Name the process you would use to separate a mixture of two miscible liquids (like acetone and water).
Give a reason for the following statement:
Gunpowder is an example of a heterogenous mixture.
While diluting a solution of salt in water, a student by mistake added acetone (boiling point 56°C). What technique can be employed to get back the acetone? Justify your choice.
What would you observe when
an aqueous sugar solution is heated to dryness.
Sucrose (sugar) crystals obtained from sugarcane and beetroot are mixed together. Will it be a pure substance or a mixture? Give reasons for the same.
List out the characteristics of Mixtures.
