1] anything around us which occupies space and has mass is called matter. for ex: a chair, a basketball, a table, etc

2] i) particles of matter are very small.

ii) They have spaces between them.

iii) they are continuously moving

iv) they attract each other

3] the process of movement of substances from higher concentration to lower concentration is called diffusion.

4] chairs, almonds, cold drinks

5] a temperature at which a substance changes its state from solid to liquid. Melting point of ice is 0°C.

6] the temperature at which liquid starts to turn into water vapour. the Boling point of water is 100°C.

7] the force exerted by gaseous molecules as they collide with the walls of their container is called pressure of gas. there are several units to measure pressure of gas. some of them are pascal(pa), torr, atmosphere and bar.

8] the process by which solid turns into liquid is called melting.

process in which liquid change into solid is called freezing.

the process by which liquid turns into gaseous is called evaporation.

9] 300K-273= 27°C

573k-273= 300°C

10] gaseous state

both liquid and gaseous as it is the Boling point.

11] Evaporation produces cooling as the particles at the surface of the liquid gain energy from the surroundings and change into vapour, thereby producing a cooling effect.

12] There are many small pores in an earthen pot. Through these pores, the water kept inside the pot evaporates. It takes the latent heat required for vaporization from the earthen pot and the remaining water in the earthen pot. Hence water loses heat making the water inside the pot cool.

13]This is because, even though both boiling water and steam are of the same temperature [ 1000c] , the steam contains the extra latent heat of vapourisation. So. steam produces more severe burns.

14] gases: nitrogen, air

Liquid: blood, honey

Solid: steel, chalk

15] i) evaporation and condensation

ii) evaporation

iii) melting

iv) sublimation

HOPE THIS HEPLS!

please Mark me as brainliest.

Verified answer

Answer:

1. A matter is referred to as a substance which has a certain mass and takes up a certain volume in space.For example pen, pencil, toothbrush, water, milk are matters as well as car, bus, bicycle is also a matter.
2. The important characteristics of particles of matter are the following: The particles of matter are very, very small. The particles of matter have space between them. The particles of matter are constantly moving.
3. Diffusion is the process of movement of molecules under a concentration gradient.
4. Chair, air, smell, almonds, cold drink, and smell of perfume
5. Therefore, the boiling point of water and melting point of ice is 100 ° C 373 K and 0 ° C ( 273 K ) respectively. Q.
6. Therefore, the boiling point of water and melting point of ice is 100 ° C 373 K and 0 ° C ( 273 K ) respectively.
7. Gases exert pressure, which is force per unit area. The pressure of a gas may be expressed in the SI unit of pascal or kilopascal, as well as in many other units including torr, atmosphere, and bar.
8. Solids can be transformed into liquids by melting, and liquids can be transformed into solids by freezing. Solids can also change directly into gases through the process of sublimation, and gases can likewise change directly into solids through deposition.
9. To convert it into Celsius from Kelvin then 273 is to be subtracted from the given kelvin scale.......................... (1) 300k= 300-273=27°C.................. (2) 573K=573-273=300°C...
10. between this temperature range i.e between 0°C to 100°C, water exists in liquid state. at 0°C, physical state of water is both liquid and solid. at 100°C, physical state of water is both liquid and gas(vapour). At 100°C- Both liquid and gas.
11. Evaporation Cause Cooling because the particles (atoms and molecules) present at the surface of the liquid surface absorb energy from their surroundings and transform it into vapour, which then causes the cooling effect.
12. The water kept in an earthen pot becomes cool during summer due to evaporation.
13. Steam will produce more severe burns than boiling water because steam has more heat energy than water due to its latent heat of vaporisation.

15. (i) condensation :- water droplets condenses upon dust particles to form clouds. (ii) evaporation :- water in the cloths evaporates to dry up the cloths. (iii) melting . (iv) sublimation :- the naphthalene balls changes from solid state directly to gaseous state , this process is called sublimation.

[tex] \rule{200pt}{2pt}[/tex]

Bro I'm Sorry plz forgive me....