Lab 4 diffusion and osmosis

Diffusion and Osmosis Virtual Due Sep 29, by 11pm Points 25 Click here for a printable version of these instructions: Lab 1C — There was some discrepancy in this experiment in the 1. Think about putting salt on a slug as you conduct your analysis of osmosis and by the end of the lab you will be able to diagram what is happening to a salted slug.

The solute potential is equal to about a 0.

Since water moves areas of high water potential to areas of low water potential, reactions took place in each part resulting in different conclusions being derived from them. This can be stated because the cores took in water while they were emerged in the distilled water.

Water potential was a key element in each part of the experiment. This shows how the onion cells had high water potential and moved to the area outside the cell with lower water potential. The data decreases consistently until the 1. Define diffusion and osmosis Discuss these processes as they apply to living cells Go to the link below and follow the online instructions to complete the lab.

If the onion cell experiment in part 1E of the lab would have produced correct results, conclusions could have been made. Lab 1D — In this part of the lab, only calculations were made, so no human error probably occurred during this time.

If the solution is hypertonic, the cell will shrivel from lack of water intake. The red blood cells would increase in size because water is moving from the area of higher water potential the distilled water to the area of lower water potential the red blood cells until dynamic equilibrium is reached.

For a plant cell, the ideal solution is a hypotonic solution because the cell takes in water increasing turgor pressure which keeps the cells tightly packed and keep their shape.

Then, after adding water back to the cells, water would have moved back into the cells increasing turgor pressure. In Lab 1B, it can be concluded that sucrose cannot pass over a selectively permeable membrane, but instead water molecules will move across the membrane to the area of lower water potential to reach dynamic equilibrium.

The lab emphasizes that diffusion is a spontaneous process that is driven by the random motion of molecules. This means they had a lower water potential and higher solute potential than the distilled water. Understand importance of diffusion and osmosis in biological organisms Understand reactions of animal and plant cells to various strengths of salt and sugar solutions In the last lab, you learned about biological molecules and their importance in the structure and maintenance of living things.

Osmosis, the movement of water through a selectively permeable membrane is also due to the random movement of the water molecules. If the solution is hypertonic, the cell will plasmolyze and died from lack of water. Lab 1C provided information that helps to conclude that potatoes do contain sucrose molecules.

It is thought that the onion cells would have plasmolyzed due to the addition of NaCl to the cells.

You need to have JavaScript enabled in order to access this site.

In an isotonic solution, the plant cell does not have enough turgor pressure to keep is shape. Lab 1A — The data collected in this lab experiment did not seem to contain any inconsistencies, so therefore no human error is detected.

In plant and animal cells, loss or gain of water can have different effects.

AP Bio Lab 1 - Diffusion & Osmosis

Lab 1B — In this lab experiment, the data seems to be compliant with the data collected by the other lab groups, so no human error was thought to have happened.

Lab 1E — In part 1E, after adding the NaCl solution to the onion cells, the cells should have reduced in size, but no reaction took place. By the end of this investigation you should be able to: This may have occurred in part because the onion itself was already dried out and dehydrated, or while the onion was being looked at through the microscope, the heat from it may have caused the cells to loose water.

In a plant cell, it is ideal to have an isotonic solution. The water potential played an enormous role in each part of this lab. In the living cell, the selectively permeable membrane is the plasma membrane the outer boundary of the cell.Learn diffusion osmosis lab 4 with free interactive flashcards.

Choose from different sets of diffusion osmosis lab 4 flashcards on Quizlet. Lab 1 Osmosis & Diffusion Osmosis Lab Introduction: Cells have kinetic energy.

This causes the molecules of the cell to move around and bump into each other. Diffusion is one result of this molecular movement. Diffusion is the random movement of molecules from an area of higher concentration to areas of lower concentration.

Osmosis. In this experiment, students use artificial cells to study the relationship of surface area and volume. Then they will create models of living cells to explore osmosis and diffusion, and observe osmosis in living cells. investigation 4 DiFFUsion anD osMosis Water moves through membranes by diffusion; this process is called osmosis.

Like solutes, water moves down its concentration gradient. Water moves from areas of Timing and Length of the Lab This investigation requires a minimum of four laboratory periods of about 45 minutes.

Lab 1 Osmosis

Lab 4: Diffusion and Osmosis (Revised Fall ) Lab 4 - Biol - Page 1 of 23 Lab 4. Diffusion and Osmosis in Selectively Permeable Membranes Prelab Assignment Before coming to lab, read carefully the introduction and the procedures for each part of the experiment, and then answer the prelab questions at the end of this lab handout.

LAB 04 – Diffusion and Osmosis Objectives: Describe the physical mechanisms of diffusion and osmosis. Lab 04 Page 4 of 11 Calculate the solute potential of a M NaCl solution at 25°C.

If the concentration of NaCl inside the plant cell is M, which way will the water diffuse if.

LabBench Activity Download
Lab 4 diffusion and osmosis
Rated 0/5 based on 66 review