Chemistry Class 11 chapter 1 Some Basic Concepts of Chemistry

 Chemistry Class 11 chapter 1 Some Basic Concepts of Chemistry 

Chemistry Class 11 chapter 1 Some Basic Concepts of Chemistry 

Chemistry Class 11 chapter 1 Some Basic Concepts of Chemistry 

Chemistry Class 11 chapter 1 Some Basic Concepts of Chemistry 

Topic: -      Matter and its classification


1. What is chemistry?
Chemistry is the branch of science that studies the composition, properties, and interaction of matter.

2. How has chemistry contributed to the nation’s development?
   chemical principles are important in diverse areas such as weather patterns, functioning of the brain,       operation of a computer, chemical industries, manufacturing, fertilizers, alkalis, acids, salts, dyes, polymers, drugs, soaps, detergents, metals, alloys, contribute in a big way to national economy.

3. How can we say that sugar is solid and water is liquid?
    Sugar has close packing of constituent particles, has its own volume and shape, therefore, it can be said to be solid whereas in water the constituent particles are not as closely packed as in solid. It has definite volume but no definite shape. Therefore it is a liquid.

4. Differentiate solids, liquids & gases in terms of volume & shapes.
 

5. How is matter classified at macroscopic level? 

    Macroscopic classification of matter –

      

6. Classify following substances as element, compounds and mixtures – water, tea, silver, steel, carbondioxide and platinum 

7. Name the different methods that can be used for separation of components of a mixture. 

The components of a mixture can be separated by physical methods like handpicking, filtrations, crystallization, distillation etc.

8. Classify following as pure substances and mixtures – Air, glucose, gold, sodium and milk. 

    Pure Substances                              Mixtures

    Glucose                                              Air

    Gold                                                  Milk

    Sodium

9. What is the difference between molecules and compounds? Give examples of each. 

Molecules consist of different atoms or same atoms. e.g. molecule of hydrogen contains two atoms of hydrogen where as molecule of water contain two atoms of hydrogen and one of oxygen. Compound is formed when two or more than two different atoms combine in fire propo e.g. water –rtion carbondioxide, sugar etc. 

10. How can we separate the components of a compound? 

    The constituents of a compound can not be separated by physical methods. They can only be separate by chemical methods.