Physical and Chemical Changes Class 7

Physical changes can be _______ or _______

Choose the chemical change among the following

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• 
• 
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Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A change is a chemical change when it is accompanied by:

• energy change

• formation of new substances

• change in chemical properties

• all of the above

Tags

NGSS.MS-PS1-2

The shipping industry has to bear huge financial losses because of rusting of ships.The rusting of ships occurs because:

• the body of ship is always in contact with water

• the air around the ship is humid

• presence of salts in sea water speed the process of rusting

• all of the above

Tags

NGSS.HS-ESS2-5

Expansion and contraction of metals is a:

• physical change

• chemical change

• irreversible change

• none of these

Tags

NGSS.MS-PS3-4

Hydrochloric acid is added to a beaker containing a piece of zinc. Zinc chloride is formed and hydrogen gas is released.This is an example of:

• chemical reaction

• physical change

• crystallisation

• none of these

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5