In this post, you will find NCERT Science Class 9 Chapter 1 Activity solutions. In Class 9 Science Chapter 1 matter in our surroundings consists of NCERT Activity 1.12 Class 9 Science Explanation with a conclusion.
NCERT Activity 1.12 Class 9 Science Explanation with a conclusion
You are suggested to study
NCERT activity 1.12 class 9 science explanation with a conclusion so that you can
attempt questions based on activity 1.12 class 9 science.
Activity 1.12 Class 9 Science
Take about 150
g of ice in a beaker and suspend a laboratory thermometer so that its bulb is
in contact with the ice.
·
Start heating the beaker on a low flame.
·
Note the temperature when eh ice starts melting.
·
Note the temperature when all ice has converted into water.
·
Record your observation for this conversion of solid to liquid state.
·
Now put a glass rod in the beaker and heat while stirring till the water
starts boiling.
·
Keep a careful eye on the thermometer reading till most of the water has
vaporized.
·
Record your observation for the conversion of water in the liquid state
to the gaseous state.
ObservationActivity 1.12 Class 9 Science
During this
activity, the temperature remains constant till the complete ice has been
melted and again temperature remains constant till the liquid gets vaporized.
ConclusionActivity 1.12 Class 9 Science
After the
observation, we can conclude that –
i.
The temperature remains constant during the inter-conversion of substance or
matter from one state to another.
ii.
Ice starts melting at 0C and the
temperature remains constant(0C) till all the ice gets melted.
iii.
When we heat a solid substance, the kinetic energy of particles
increases, and due to which force of attraction decreases and inter-particle
spaces increase, then the solid is converted into liquid.
iv.
The heat energy is used to overcome the force of attraction between
particles of solid, and the solid gets converted into liquid. The amount of heat energy utilized in breaking the force of attraction between particles of solid is known as ‘ Latent heat of fusion
v.
The temperature at which a liquid boils at one-atmosphere pressure is called the boiling point. The boiling point of water is 100 C. During the boiling of water temperature
remains constant(100C).
vi.
The amount of heat energy is
utilized in breaking the force of attraction between particles of liquid, this
is known as ‘ Latent heat of vaporization.
Question based on the activity 1.12
1. What is the melting point of
ice?
Ans – The melting point of ice is 00℃(273 K).
2. What is the boiling point of
water?
Ans – The boiling point of water is 100℃ (373K).
3. What is the hidden energy called?
Ans –
Latent heat
4. Does temperature remain
constant during the melting of ice?
Ans – Yes, the
temperature remains constant.
5. Does temperature remain
constant during the boiling of water?
Ans - Yes, the
temperature remains constant.
6. Where does the supplied energy
go?
Ans – The supplied
energy is consumed in overcoming the force of attraction between the particles
of matter during the melting and boiling.
Related Topics
1. Activity 1.13 Class 9 Science
2. Activity 1.11 Class 9 Science
