Diffusion of Gases/Gas Pressure

Question 1

Diffusion

Answer 1

-movement of particles from an area of higher concentration to an area of lower concentration

Question 2

How does diffusion work?

Answer 2

-particles in a gas move randomly in all directions
-go from one place to another

Question 3

Why is it slower to diffuse bromine when air is blocking it?

Answer 3

-the air and bromine molecules are colliding with themselves and eachother
-whereas in a a vaccum, bromine would spread immediately, as in a vaccum there’s no air to collide with

Question 4

Why does nitrogen dioxide diffuse at a much faster rate than bromine?

Answer 4

-bromine molecules are much heavier (they are dragged down)

Question 5

How to compare the rate of diffusion of two different gases?
(e.g. ammonia and hydrochloric acid)

Answer 5

-dip one piece of cotton in ammonia, the other in hydrochloric acid
-put them in a test tube and it should form a white ring where the gases meet
-if the ring is further from one, that one has diffused at a faster rate

Question 6

What is pressure caused by?

Answer 6

-gas or liquid particles colliding with the walls of a container

Question 7

How to increase pressure?

Answer 7

-add more particles into the same container
-reduce the volume of the container
-or increase the temperature