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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 7

Name the Terms for the Change of a Solid into Liquid.

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प्रश्न

Name the terms for the change of a solid into liquid.

एक शब्द/वाक्यांश उत्तर
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उत्तर

Melting.

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पाठ 1: Matter and Its Composition - Exercise

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एस.पी. सिंह Concise Chemistry [English] Class 7 ICSE
पाठ 1 Matter and Its Composition
Exercise | Q 12.1

संबंधित प्रश्‍न

The molecules can move freely anywhere in


 Name the terms for the change of vapour into a liquid.


Classify the following into elements, compounds and mixtures:

  1. Sodium
  2. Soil
  3. Sugar solution
  4. Silver
  5. Calcium carbonate
  6. Tin
  7. Silicon
  8. Coal
  9. Air
  10. Soap
  11. Methane
  12. Carbon dioxide
  13. Blood

Explain why air is used to inflate tyres.


Define matter. Give four examples of matter.


When extremely small particles X derived from the anther of a flower were suspended in a liquid Y and observed through a microscope, it was found that the particles X were moving throughout the liquid Y in a very zig-zag way. It was also observed that warmer the liquid Y, faster the particles X moved on its surface.

  1. What could particles X be ?
  2. What do you think liquid Y is ?
  3. What is the zig-zag movement of X known as ?
  4. What is causing the zig-zag movement of particles X ?
  5. Name the scientist who discovered this phenomenon.
  6. What does this experiment tell us about the nature of liquid Y?

What are (i) metals (ii) non-metals, and (iii) metalloids ? Give two examples each of metals, non-metals and metalloids.


Which of the following statements are true for pure substances ?

  1. pure substances contain only one kind of particles
  2. pure substances may be compounds or mixtures
  3. pure substances have the same composition throughout
  4. pure substances can be exemplified by all elements other than nickel

In the following set of substances, one item does not belong to the set. Select this item and explain why it does not belong to the set :

Hydrogen, Oxygen, Steam, Chlorine


State whether colloidal solutions are homogeneous or heterogeneous.


How will you test whether a given solution is a colloidal 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.


Name the process by which common salt is purified.


Name the process by which all the dye can be recovered from black ink.


How will you separate a mixture containing sand and sugar ?


The property which allows the metals to be hammered into their sheets is ______.


The most reactive metal is ______.


Which statement is not correct for a mixture 


Atoms are tiny particles that repel each other when they are squeezed very close.


Gases do not diffuse very easily.


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