Diffusion and osmosis

What process causes the dye molecules to spread out in the water?

• diffusion

• osmosis

• active transport

The gummy bears swell up if left in pure water. What causes this?

• Water has gone into the bear by osmosis

• Water has left the bear by osmosis

• Water has gone into the bear by active transport

Diffusion uses energy to happen

• True

• False

Osmosis uses energy to happen

• True

• False

Which is the correct definition for osmosis?

• Diffusion of molecules across a membrane

• Diffusion of water molecules across a semi-permeable membrane from high to low water concentration

• Diffusion of molecules from a high concentration to a low concentration

Diffusion is passive. What does this mean?

• No energy is used to make it happen

• Energy is needed to make it happen

• It needs a small amount of energy to make it work

What does equilibrium mean in terms of diffusion?

• The molecules are spread out evenly

• There is a high concentration of molecules

• There is a low concentration of molecules

The gummy bears shrink if left in salt water. What causes this?

• Water has gone into the bear by osmosis

• Water has left the bear by osmosis

• Water has left the bear by active transport

Tags

NGSS.MS-PS1-2

Why do the gummy bears swell up if left in pure water.

• Water has gone from an area of high concentration outside the bear, to an area of low water concentration inside the bear

• Water has gone from an area of low concentration outside the bear, to an area of high water concentration inside the bear

• Water has left the inside of the bear to go into an area of low concentration