Which of the following is the easiest to change?
The colour of your hair
The shape of your face
The colour of your eyes
Both A & C
Which of the following is not a reversible change?
Heating of water to steam
Cooking of egg to scrambled eggs
Heating of wax to molten wax
Cooling a cake
Dissolving salt in water is a/an:
Endothermic change
Exothermic change
Both A and B
Chemical combination
When a solid directly turns into gaseous state, it is called:
Sublimation
Condensation
Polymerisation
Melting
We keep food at low temperature in a refrigerator because it:
Saves money
Makes food more tastier
Kills bacteria present in the food
In fashionable to keep the food in the refrigerator
In an endothermic reaction:
Energy is released
Energy is absorbed
Energy is neither released nor absorbed
Energy is not required
The cells used in a wrist watch undergo:
Physical change
Periodic change
Chemical change
None
The making of a ring from gold is a ______ change and making a statue from wood is a _______ change.
Irreversible, reversible
Reversible, irreversible
Irreversible, irreversible
Reversible, reversible
On decreasing temperature, a liquid turns into solid. This is:
Freezing
Melting of ice is an example of:
Exothermic reaction
Endothermic reaction
Chemical decomposition
