it's about a lab we did on osmosis...?
916209
The easiest way to understand osmosis is to think about a bottle of strong perfume.  When you take the lid off the molecules spread out filling the room slowly with smell.  Molecules move from an area of high concentration to an area of low concentration.  (that is your answer, I believe)  Another way to understand it is to drop food coloring into a large bowl of water.  It will slowly spread throughout the bowl.
42026
It is used to contain the chemicals in the lab !!!
196649
Several ways to do this. The first that occurs to me is to have the mammalian cell culture in a sealed chamber and measure the gases via IR spectroscopy in the chamber. The loss of oxygen in the gas of the chamber would be the uptake. Such methods are quite sensitive.
209349
Not a whole lot... but I can see how. Fluid in some plants can be electrolytic.
84704
What equipment?\nWhat experiment?\nWhat error?
242420
Wow, amazingly my roommate's 10 year old did this experiment for his science project a few weeks ago.  If the still water is hot, it doesn't take too long.  I think it was around 30 seconds for the mix to be complete.  If the water is cold, then it takes significantly longer (if you mean complete diffusion, then it would probably take five minutes).  We stopped the timer when we could not see a significant amount of clear water, and it appeared that the dye had spread through most of the water.  I think it was around 3 minutes (maybe a little more).  We used a cup of water and two drops of dye for each test.  We timed hot water and cold water spreading.
852174
Sounds like a typo.  Call the lab that performed the test.
414377
Actually U cannot test da water need in photosynthesis. Because da two rules in all experiments to test da agents of photosynthesis r, That da plant should be destarched\nand Da experiment should be controlled. But in the case of water u cannot control water..
638216
All of these may have an effect on absorbance since they all have the potential to affect the final concentration of the solutions being measured; In (a), you don'y know what might be in the wet stuff in the beaker, so your absorbance might go up.  In (b), because the pipet has not been "wetted" with your solution, you might pick up less than you thought, so your concentration might be lower and give a lower absorbance.  I'll let you figure out (c) for yourself since I can't be sure what you typed!
766824
My daughter did a project where she tested the absorption of various brands of paper towels.  She did an experiment and wrote a paper on what makes paper towels hold liquids.
1164529
Visking tubing is partially permeable.\ncut 2 pices of Visking tubing 12cm long.tie one end of each with cotton.fill "cell A" with sugar solution & "cell B" with water.tie the other end & weigh each "cell".put "cell A" into a beaker of water.put "cell B" into a beaker of sugar solution.after 30 minutes reweigh each "cell".Cell A increases in weight because water has passed into the cell,into the srong solution by osmosis.Cell B decreases in weight because water has passes out of the cell,into the strong solution by osmosis.\nhope that helped-cheers!
869952
Umm...If you're going to ask questions about your lab assignment  here, you should at least make the questions ones that don't need our direct observation of your experiment to answer.\n\nLook at your lab notes (you took notes, right?) and write down in your discussion whether you saw growth on the agar.
552084
I assume this is based on the principle of Osmosis. I would like a bit more data before answering further.
171064
Is this a lab exercise?
354566
The osmolarity property.
111661
there are different levels of purity of water and other solvents. the more pure the solvent is the more expensive.\nfor most introductory labs or where the results aren't critical then walmart quality distilled or deionized water is ok.\nfor other purposes you'd want to use the really good stuff.
158796
I assume you know what osmosis is.\nIt would be nice to end up with enough results to plot a graph (LINE graph) so you will need at least four (more is better) solutions of different concentrations. Sucrose solution is usually used.\nUse a BIG potato so that all your samples are as similar as possible.\nThe easiest way to get uniform samples is to cut cylinders with a cork borer, then cut into 5mm disks.\nPut 10 discs into each solution.\nWeigh 10 discs before they are put in, then CAREFULLY blot them dry and reweigh them next day.\nCalculate the change in mass per gram of potato (you could expect some to gain, some to stay the same and some to lose so you will get some negative values).\nPlot a line graph of 'change in mass per gram of potato' AGAINST 'concentration of solution'.\nNow you must consider what the graph show you.