unit 1A: diffusion and dilution

Question 1

what is diffusion?

Answer 1

is the random movement of substance from an area of high concentration to area lower concetration

Question 2

what is dilution?

Answer 2

adding water to a solution

Question 3

why does diffusion occurs in gases in air and liquid like water?

Answer 3

because their particles can move around and collide with each other randomly

Question 4

what is diffusion affected by ?

Answer 4

• the type of substance
• the tempurature

Question 5

why does subtance diffuse more quickly through gases than through liquid ?

Answer 5

this is because the particle in a gas are more spread out and move faster than the particles in a liquid

Question 6

why the hotter the gas or liquid, the faster diffusion happens ?

Answer 6

this is because the particle have more energy and move faster at higher tempurature

Question 7

why diffusion does not happen at all in solid?

Answer 7

because the particle in a solid can only vibrate on spot, rather than being able to move from place to place

Question 8

(bromine gas and air) what happens when the glass plate is removed?

Answer 8

bromine gass diffuses through the air –> random motion

Question 9

(the diffusion of ammoinia and hydrogen chloride) why white ring of ammonium chloride is formed nearer the hydrogen chloride end of the tube?

Answer 9

because the ammonia particles travelled further.

Question 10

why can ammonia can diffuse at a higher speed ?

Answer 10

because ammonia particle are lighter

Question 11

( adding water to copper solution) why adding more water to a copper solution makes a paler shade of blue ?

Answer 11

becuase the blue particle will now be further apart

Question 12

Hydrogen chloride gas and ammonia gas react together to form a solid compound.

What is the name of this compound?

Answer 12

ammonium chloride