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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 7

What Are Molecules ? - Chemistry

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प्रश्न

What are molecules ?

एका वाक्यात उत्तर

उत्तर

Molecules are made of atoms. Molecules exhibit the properties of that kind of matter and has independent exi stance.

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पाठ 1: Matter and Its Composition - Additional questions

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सेलिना Concise Chemistry [English] Class 7 ICSE
पाठ 1 Matter and Its Composition
Additional questions | Q 7

संबंधित प्रश्‍न

The molecules can move freely anywhere in


What do you mean by the inter-molecular spaces? How do they vary in different states 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?

During respiration, glucose and oxygen enter our body cells and waste products carbon dioxide and water leave the body cells by the process of :


Name one solid, one liquid and one gaseous non-metal.


Classify the following into elements and compounds :

  1. H2O
  2. He
  3. Cl2
  4. CO
  5. Co

Which of the following substances are elements ?

Water, Salt, Mercury, Iron, Marble, Diamond, Wood, Nitrogen, Air, Graphite, Hydrogen, Oxygen, Sugar, Chlorine


Draw a flow-chart for the schematic representation of different types of matter.


Calculate the concentration of a solution which contains 2.5 g of salt dissolved in 50 g of water.


Fill in the following blank :

A colloid is a ..............mixture and its components can be separated by the technique known as ...............


Explain what happens when a beam of light is passed through a colloidal solution.


What is meant by a solution ? Give two examples of solutions.


State whether the following statement are true or false :

Alcohol can be separated from a mixture of alcohol and water by a separating funnel.


Name the process which can be used to recover salt from an aqueous salt solution.


Explain how, impure copper sulphate can be purified by crystallisation.


Which of the following mixture cannot be separated by using water as the solvent ?


Select the correct answer from A, B, C, D & E for the statement given below:

An atom or group of atoms _________ having a resultant charge.


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


The fluidity of solids: ______.


Write a scientific reason.

Lemon sherbat has sweet, sour and salty taste and it can be poured in a glass.


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