English

Change is the Law of Nature and Occurs in Our Everyday Life, at All Times and in All Places. Differentiate Between the Following Change with a Suitable Example. Natural and Man-made Change. - Chemistry

Advertisements
Advertisements

Question

Change is the law of nature and occurs in our everyday life, at all times and in all places.
Differentiate between the following change with a suitable example.

Natural and man-made change.

Distinguish Between
Advertisements

Solution

Natural change Man-made change
(i) Changes brought about by – nature. (i) Changes brought about by – man.

(ii) Examples: 

  1. Growth in man and plants
  2. Change in seasons brought about by nature.

(ii) Examples:

  1. Buring of fuels and chemical reactions.
  2. Conversion of iron to steel.
shaalaa.com
  Is there an error in this question or solution?
Chapter 2: Physical and Chemical Changes - Exercise

APPEARS IN

Viraf J. Dalal New Simplified Middle School Chemistry [English] Class 7
Chapter 2 Physical and Chemical Changes
Exercise | Q 1.4

RELATED QUESTIONS

 Write short answer.

Give an example of desirable change which can also be undesirable


State whether the following is physical or chemical changes.

photosynthesis — 


What are man-made changes ?


Separate the following into physical and chemical changes :

Sublimation of a solid, Decomposition of water into hydrogen and oxygen by passing electric current, Formation of clouds, Making a fruit salad from raw fruits, Dissolving carbon dioxide in water


Read the paragraph and note down the various types of changes it mentions.
It was nearing six o'clock in the evening. The sun was setting. A breeze was blowing. Leaves on the tree were shaking. Sahil was sitting in the courtyard, rolling balls of wet soil, and shaping them into various toys. Then he felt hungry and went into the house. Mother made a dough from wheat flour and fried purees. While eating hot purees, his attention was drawn outside the window. It had started raining. There was lightning, too. Sahil was enjoying his dinner in the dim light.


Ammonium chloride is also a sublimable solid. Give a reason why the sublimation of ammonium chloride involves a physical and a chemical change.


Give reasons why – separation of mixtures e.g. iron from a mixture of iron and sulphur is a physical change, but heating a mixture of iron and sulphur is considered a chemical change.


Select the chemical changes from the following list of changes

Rotting of eggs.


Select the chemical changes from the following list of changes

Preparation of carbon dioxide from calcium carbonate & dilute hydrochloric acid.


______ is the Universal Solvent.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×