🧪 | Unit 1 | Particulate Nature of Matter

Question 1

What is special about b.p. of a

pure substance?

Answer 1

Pure substances have a fixed b.p.

Question 2

What is special about the b.p. of a

mixture?

Answer 2

Mixtures boil over a range of temperatures.

Question 3

Arrangement of solid particles

Answer 3

Regular, fixed

Question 4

Arrangement of liquid particles

Answer 4

Irregular, unfixed

Question 5

Arrangement of gas particles

Answer 5

No arrangement

Question 6

Distance between solid particles

Answer 6

Very closely packed

Question 7

Distance between liquid particles

Answer 7

Particles are loosely packed and still touching

Question 8

Distance between gas particles

Answer 8

Particles are far apart

Question 9

Movement of solid particles

Answer 9

Particles vibrate in fixed positions

Question 10

Movement of liquid particles

Answer 10

Particles slide against each other

Question 11

Movement of gas particles

Answer 11

Particles move quickly in random directions

Question 12

How does melting take place?

Answer 12

∘ at a specific temperature
∘ heat energy is converted into kinetic energy and the particles move faster, causing them to change from solid state to a liquid state