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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 7

Differentiate between an atom and a molecule.

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प्रश्न

Differentiate between an atom and a molecule.

अंतर स्पष्ट करें
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उत्तर

  Atom    Molecule
1. Atoms are described as the smallest particles of an element that do not exist freely in nature but participate directly in chemical reactions. 1. A molecule consists of bound atoms that exist freely in nature but do not directly participate in chemical combinations.
2. The symbol of an element represents its atom. For example, the symbol H represents a hydrogen atom. 2. The molecular formula represents any substance's molecule. For example, the oxygen molecule is represented as O2.
3. An atom is made up of subatomic particles i.e., electrons, protons, and neutrons. 3. Molecules are made up of two or more atoms, which either be from the same or different elements.
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अध्याय 1: Matter and Its Composition - Exercise

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सेलिना Concise Chemistry [English] Class 7 ICSE
अध्याय 1 Matter and Its Composition
Exercise | Q 6

संबंधित प्रश्न

The inter-molecular space is maximum in


The molecules can move freely anywhere in


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

Bromine and air take about 15 minutes to diffuse completely but bromine diffuses into a vacuum very rapidly. Why is this so?


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.


Name the property which allows metals to be hammered into thin sheets.


What elements do the following compounds contain ?

Sugar, Common salt


Name a metal which is yellow in colour.


One of the following substances is neither a good conductor of electricity nor an insulator. This substance is :


What do you understand by the statement " the solubility of copper sulphate in water at 20°C is 20.7 g" ?


Fill in the following blanks with suitable words :

The gases of air can be separated by fractional distillation of liquid air because they have different..............


State whether true or false. If false, correct the statement.

Oil and water are immiscible with each other.


Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.

Name a non-metal which exists as a liquid at room temperature.


Atoms or groups of atoms having a charge are called ______.


Boiling refers to the process by which a substance changes from the liquid to the gaseous state at its ______ point.


Define the term matter.


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