Question

Question 1

Which of the statements below is the best hypothesis for the osmosis lab.

If a salt water solution is placed inside of the potato and plain tap water is placed outside of the potato then osmosis will occur and water molecules will move into the potato. And the level of water inside of the potato will rise.

If plain tap water is placed inside of the potato and a solution of salt water is placed outside of the potato then osmosis will occur and water molecules will move into the potato

If the the potato is soaked in salt water then it will gain weight by the water molecules moving into the potato cells. This is not osmosis

I think there should be no net movement of water molecules (osmosis) because the potato cells are already in an isotonic state.

Question 2

Which of the following is a good indicator that osmosis has occurred?

The water level inside of the potato has risen.

The potato is soggy and discolored.

There is no change in the potato or the levels of water.

The water level outside of the potato has decreased because the water evaporated.

Question 3

Which of the following solutions is considered hypotonic? (Points : 3)

The plain tap water

The salt water

The spilled water

The wine you used instead of water

Question 4

A good purpose statement for this lab is: The purpose of this lab experiment is to show that water molecules move from high to low concentration; the water will move by osmosis. (Points : 2)

True

False

Question 5

It is not necessary to take measurements of the water in the potato in this lab, you can see if there is a change (osmosis) just by looking at it. But you would want to collect data for the results in a written lab report.

True

False

Question 6

The graph or chart (results) with the information for this lab should include: beginning and ending data, labels, units and times of measurement if written in a formal lab report.

True

False

Question 7

The conclusion is usually the longest section of a lab report. This is the section where you explain or analyze the results you found.

True

False

Question 8

In your osmosis/potato lab, the plain water is the solvent.

True

False

Question 9

The cell membrane around the potato cells is permeable to water molecules. This explains why the salt does not move into and out of the cells but the water molecules do........... raising (increasing) the water level.

True

False

Question 10

Evidence to support osmosis in this lab might include the water level rising inside of the potato filled with salt water.

True

False

Question 11

In your osmosis/potato lab, the molecules of salt are the solute.

True

False

In 5 sentences or less, how can you relate, compare or contrast what happened to the potato (cells) to what occurs in your own body cells? Your response does not need to be specifically related to just salt (NaCl) molecules. Consider other molecules if you wish.

Question 13.

In your osmosis/potato lab the mixture of the salt and water is the solution.

True

False

Answer 1

1.

If a salt water solution is placed inside of the potato and plain tap water is placed outside of the potato then osmosis will occur and water molecules will move into the potato. And the level of water inside the potato will rise.

This is osmosis as the salt water is the hypertonic solution and when this solution is placed inside the potato and potato is placed in the tap water then water will move through the semipermeable membrane from the high concentration ie tap water to the inside i.e hypertonic solution where water concentration is low.

2. The water level inside of the potato has risen.

due to endosomosis, the water molecules move from outside tap water to inside hypertonic salt solution.

3. The plain tap water

Hypotonic solutions have more water than a cell. Thus Tapwater and pure water are hypotonic.

4. True

water moves from high to low concentration through a semipermeable membrane in osmosis.

5. True

6. True

7. True

8. True

plain water is always the solvent.

9. True

10. True

11. True

and solute never passes through the semipermeable membrane.

13. True

solute + solvent = solution