In an endothermic reaction:
Energy is released
Energy is absorbed
Energy is neither released nor absorbed
Energy is not required
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
On decreasing temperature, a liquid turns into solid. This is:
Condensation
Melting
Freezing
Sublimation
A seed growing into a tree is an example of:
Slow physical change
Fast periodic change
Slow natural change
Man made reversible change
Melting of ice is an example of:
Exothermic reaction
Endothermic reaction
Chemical combination
Chemical decomposition
Dissolving salt in water is a/an:
Endothermic change
Exothermic change
Both A and B
Which of the following is a feature of physical change?
It is reversible
It is temporary
No new substance is formed
All of these
Identify the substance that evaporates at room temperature:
Water
Oil
Kerosene
Ammonium chloride
When nitrogen reacts with hydrogen under high temperature and pressure ammonia, which is also a gas is formed. This is an example of:
Physical change
Oxidation
When a solid directly turns into gaseous state, it is called:
Polymerisation
