20 amazing fact of Science related to chapter 1 of NCERT class 9th
Answers
Explanation:
not 20 but some are given in the photo I hope,you will like it
Answer:
1 . Everything in this universe is made up of material which scientists have named " matter" .
2 . Matter is made up of particles .
3. Particles of matter are continuously moving , that is kinetic energy .
4 .The forces of attraction between the particles are maximum in solids , intermediate in liquids and minimum in gases .
5. We can difference between solids , liquids and gases .
a . compressibility
b. volume and area
c.shape
d.intermolecular space
e.boiling and freezing point
rigidity
6. Physical properties of matter are classified as solid liquid and gas .
7 . Chemical properties of matter are classified as elements compound and mixtures .
8. A small rain drop contain about 10 to the power 21 .
9 . Solid have fixed shape as the particles attract each other . The force which acts between similar molecules is called cohesive force .
10 . Evaporation is a surface phenomenon.
11 . Evaporation depends on surface temperature humidity .
12 . On increasing the temperature of solid , the kinetic energy also increases .
13 . The process in which solid directly change into gaseous state without going through the liquid state is called sublimation .
14 . Evaporation causes cooling .
15 . Boiling is a bulk phenomenon .
16 . Plasma consists of super energetic and super excited particles .
17. Pressure and temperature are responsible for changing the state of particles .
18 . The heat energy required to change 1 kg of liquid into gas ai atmospheric temperature is called latent heat of vaporization .
19. The heat amount required to change 1 kg of solid into liquid at its melting point is called the latent heat of fusion .
20. The meaning of " latent" is hidden .