the particulate nature of matter

Question 1

brownian motion

Answer 1

random movement of microscopic particles suspended in a fluid

Question 2

solid arrangement of particles

Answer 2

closely packed
arranged in an orderly manner

Question 3

motion of particles solid

Answer 3

vibrate about fixed positions (will not see particles exchanging positions)

Question 4

attractive forces between particles solid

Answer 4

very strong

Question 5

arrangement of particles liquid

Answer 5

less closely packed
arranged in a disorderly manner

Question 6

arrangement of particles gas

Answer 6

very far apart
arranged in a disorderly manner

Question 7

motion of particles liquid

Answer 7

slide over one another

Question 8

motion of particles gas

Answer 8

move rapidly in random directions

Question 9

attractive forces between particles liquid

Answer 9

strong

Question 10

attractive forces between particles gas

Answer 10

very weak

Question 11

observable properties of solids

Answer 11

fixed shape
fixed volume
cannot be compressed
cannot flow

Question 12

observable properties of liquids

Answer 12

no fixed shape
fixed volume
cannot be compressed
can flow

Question 13

observable properties of gases

Answer 13

no fixed shape
no fixed volume
can be compressed
can flow

Question 14

are particles moving in all substances?

Answer 14

yes. so, they all have kinetic energy

Question 15

what happens to the mass of solids when they expand?

Answer 15

during heating, particles in solid only move further apart from one another, thus occupying a greater volume. since the numver of paticles in the solid remains the same, the mass of the solid remains the same

Question 16

what happens to the density of a solid when it expands?

Answer 16

decreases. because volume increases but mass stays the same.

Question 17

evaporation vs boiling

Answer 17

evaporation occurs at the surface of the liquid, occurs at any temperature, no bubbles seen

boiling occurs throughout the liquid, occurs at boiling point, bubbles seen

Question 18

do particles and masses of particles change during change of state?

Answer 18

no