Diffusion and Osmosis

What is diffusion

• When molecules move

• When molecules don't move

• When molecules move from high to low concentration

• When molecules are balanced

Answer explanation

Diffusion is the process where molecules move from an area of high concentration to an area of low concentration, seeking to balance out. This makes 'When molecules move from high to low concentration' the correct choice.

Permeable means?

• Particles can pass through

• things are permanent

• particles concentration levels are different

• particles are stuck

Answer explanation

Permeable refers to a material that allows particles to pass through it. Therefore, the correct choice is 'Particles can pass through', as it accurately describes the meaning of permeable.

Particles will move from an area of high concentration to an area of lower concentration until they reach...

Answer explanation

Particles will move from an area of high concentration to an area of lower concentration until they reach equilibrium, where the concentration is uniform throughout the space.

What word describes when some particles are able to pass through a membrane and other are not

• Diffusion

• Selectively permeable/Semi-permeable

• Equilibrium

Answer explanation

The term 'selectively permeable' or 'semi-permeable' describes a membrane that allows certain particles to pass through while blocking others, making it the correct choice for this question.

In what situation would diffusion happen fastest

• Making chocolate milk from chocolate powder and milk

• Putting a tea bag in a mug of hot water

• Spraying perfume in the changeroom

Answer explanation

Diffusion occurs fastest in hot water because increased temperature raises molecular movement, allowing the tea's flavor compounds to spread more quickly compared to the other options.

How does the body remove Carbon dioxide from cells

• Cells change carbon dioxide into oxygen

• Cells don't remove CO2, they sore it for future use

• Carbon dioxide is dissolved by the nucleus

• Carbon dioxide diffuses out of cells into the bloodstream

Answer explanation

Carbon dioxide diffuses out of cells into the bloodstream due to concentration gradients. This process allows CO2, a waste product of metabolism, to be transported to the lungs for exhalation.

Which of the following molecules travels (easily) across the semi-permeable membrane during osmosis

• Glucose

• Sodium chloride (salt)

• Protein

• Water

Answer explanation

Water is a small, polar molecule that can easily pass through semi-permeable membranes during osmosis, while larger molecules like glucose, sodium chloride, and proteins cannot cross as easily.

Where is there a lower concentration of water? The red are salt particles (can't pass through the membrane) and the blue is water

• Left side

• Right side

Answer explanation

The left side has a lower concentration of water because the red salt particles cannot pass through the membrane, leading to a higher concentration of salt and thus a lower concentration of water compared to the right side.

What is Osmosis

• WHen particles movh

• When water particles move

• process by which water moves across a selectively permeable membrane (from high [ ] to low [ ]) until both sides of the cell have reached equilibrium. 

Answer explanation

Osmosis is the process by which water moves across a selectively permeable membrane from an area of high concentration to an area of low concentration, achieving equilibrium on both sides of the cell.

Semi-permeable means...

• Particles can pass through freely

• Things are permanent

• Some particles can pass through

• Particles concentration levels are different

Answer explanation

Semi-permeable refers to a membrane that allows some particles to pass through while blocking others. This means that not all particles can move freely, making 'Some particles can pass through' the correct choice.