Which of these are examples of diffusion?
i a helium-filled balloon rising in air
ii a hydrogen-filled balloon deflating, due to
gas passing through the skin
iii the smell of perfume from a person
standing on the other side of a room
iv sucking a drink from a bottle, using a straw
v an ice lolly turning liquid when it is left out
of the freezer
vi the tea in the cup changing colour when
you add milk, without stirring
vii a light, coloured gas, spreading down
through a gas jar
viii a blue crystal forming a blue solution, when
it is left sitting in a glass of water
ix spraying paint from a spray can.
Answers
Answer:
iii, iv, vi, vii, viii, ix
Explanation:
Diffusion is the movement of molecules from higher concentration to lower concentration
therefore, the answers
iii) because when perfume in one side of room, only that side has the molecules of perfume there i.e. higher concentration, and other areas are lower concentration
iv) when you suck a drink from a bottle, you are inhaling air in your mouth, this forms some vacuum and therefore to fill the empty space, the drink rushes in
vi) because the colour of milk is different and tea is different. Where there is a lower saturation of tea, the tea molecules move there and vice versa
vii) same as vi
viii) same as vi
ix) when the nozzle is pressed the air in it is forced out. This causes the upper part of the can to have higher concentration of air then in the tube therefore the air tries to the lower concentrated area while pushing on the paint letting it out