1)What would happen to its weight if you put an osmometer full of pure water into a beaker full of 15% sucrose? Why? (use solute concentration, water concentration, and ___tonic words in your answer)

2)What would happen to its weight if you put an osmometer full of 15% sucrose into a beaker full of pure water? Why? (use solute concentration, water concentration, and ___tonic words in your answer)

the weight would decrease. the sucrose solution is hypertonic(has less water concentration and more solute concentration) to the water in the osmometer .Sucrose did not move because the membrane pore sizes were too small to allow sucrose to pass through but were big enough for water. There is a net movement of water molecules, by osmosis, from the water inside the osmometer(hypotonic) through to the sucrose solution. This concentration gradient caused water to diffuse through the dialysis tubes making the tubes lose weight.

 the weight would increase. The sucrose solution is hypertonic(has less water concentration and more solute concentration) to the water. it is a more concentrated solution. There is a net movement of water molecules, by osmosis, from the water outside to the sucrose solution inside the osmometer. This makes the liquid level in the osmometer rise. This concentration gradient caused water to diffuse into the dialysis tubes making the tubes gain weight.

A less solute concentrated solution is hypotonic to a more  solute concentrated solution, while two solutions at the same concentration are isotonic.

Step-by-step explanation

Substances can move into and out of cells through the cell membrane. The three main types of movement are diffusion, osmosis and active transport.

1)smaller molecules like water and glucose pass through  the pseudomembrane microscopic holes

2)larger molecules like starch and sucrose cannot pass through pseudomembrane