Question Text
Question 1 :
State true or false: Condensation of steam is not a chemical change.
Question 2 :
Stretching of rubber band is not a physical change. Is this statement true or false?
Question 3 :
The gas we use in the kitchen is called liquefied petroleum gas (LPG). In the cylinder it exists as a liquid. When it comes out from the cylinder it becomes a gas (Change-A) then it burns (Change-B). The following statements pertain to these changes. Choose the correct one.
Question 4 :
Cutting of a log of wood into pieces is which type of change?
Question 5 :
Grinding of wheat grain changes its size. It is a _____ change.
Question 7 :
Which one is an example of a chemical reaction where sound is produced ?
Question 8 :
Which type of change is beating of aluminium metal to make aluminium foil?
Question 9 :
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust . Is rust different from iron?
Question 11 :
State true or false: Since rusting is possible only in presence of moist air, therefore no rusting occurs on painting.
Question 12 :
State true or false: Formation of manure from leaves is a physical change.
Question 14 :
When a candle burns, both physical and chemical changes take place. Is this statement true or false?