question about an experiment?
613069
1.  There is no process going on in beaker A.\n2.  The process in beaker B is endothermic, as it consumes heat from the surroundings.\n3.  He's studying the heat of solution of sodium nitrate.\n4.  It's negative, as it's an exothermic process (the heat of the system is lower than it was to start, as heat was given off to the surroundings).
171064
Is this a lab exercise?
292071
What class was this in? What grade level? What text were you using?  I may be able to help you if I know the context in which the question was raised. I have a feeling that I am not getting all the information you had. Please tell me and maybe I can help. I am an old chemist and microbiologist.
268188
Yes. I think so... I think my cousin just did that experiment not too long ago. I guess it's because of the sugar in it or something.
562274
Diffusion of a Dye in Hot and Cold Water\n\nPurpose:  The purpose of this experiment is to demonstrate the principle of diffusion.  Diffusion is the net movement of particles (atoms, ions, or molecules) from an area of greater concentration to areas of lesser concentration.\n\nMaterials and Methods:  For this experiment, the student will require a projector, two petri dishes, two 150 ml beakers, hot plate, potassium permanganate (purple dye), and a spatula.  Obtain about 50 ml of cold water in one beaker and about 50 ml or boiling water in the other.  Place the petri dishes on the projector and add cold water to one dish and boiling water to the other.  Allow the water in the dishes to become still.  Using the spatula, add a crystal of potassium permanganate to the center of each dish\n\nExperiment:  Observe the experiment for several minutes and note what happens to the purple dye in each petri dish.\n\nConclusion:  Do you observe diffusion in each?\n\nHow does the rate of diffusion differ? \n\nWhy is there a greater rate of diffusion in one
745178
What is known comes from experiment.
311582
the correct answer should be # 2 because the main point of the experiment is that "the same steps don't always produce the same results"
269782
That's what they say.  I haven't seen it work in action yet.  Most of those who have set something free, it didn't come back.  I'm running my own experiment, so maybe I'll have an answer for you then.
707097
an experiment is used to test a hypothesis.  \nhypothesis: i think that if i drop my pencil, it will stop when it hits the ground.\nexperiment: drop your pencil.\n\nif it stops when it hits the ground, you have proven your hypothesis.  if it goes through the ground, you had better find some wings fast, becuase the you are about to fall a very long way, or else you are dreaming ;)
78938
Try this link :)\nhttp://www.scienceproject.com/
468283
Depends on the quantity of ice in the water, time you measure it at, etc. All depends on the precise details of the experiment.
977052
You need a variable in any experiment to compare results. Perhaps you could use cold (ice) water in one container, warm in another and hot or boiling in another. You can then make your prediction on which will dissolve first and have an experiment that will verify whether you have made an accurate prediction.
568503
the Michelson-Morley experiment\n\nhttp://en.wikipedia.org/wiki/Michelson-Morley_experiment
99344
If you asked me this same question about 5 yrs ago, I couldve answered without blinking. Now I would have to go back to my notes from when I actually had done the experiment to be of any help. Good Luck
826531
tiny amounts of chemical can stick to differnt things, like stir bar, stir rod, thermometer and if you remove these items before the experiment is over then you remove some chemicals.  Other kinetics events that your not considering. as in pressure, humididtym and so on.  If you used a Ph probe then maybe it wasn't calibrated right or isn't properly maintained
164254
The following really fun and interesting demonstration that is easy to set up:\n-This experiment should be performed outside as it creates quite a mess.  But it's worth it!\n-You will need  roll of Mentos brand mints, and a bottle of soda pop.\n-Roll a piece of paper into a tube, and put the Mentos in it (unless you have a flask/large test tube that the mints will fit in.  Trying to drop the mints in one by one will not work, the whole roll needs to go in nearly at once.\n-Open the soda bottle, line up your roll of paper with the mouth of the bottle, and drop in all of the mints.\n-You'll get a large eruption of soda!  I would suggest the person who drops the mints wear a poncho, or some type of protection against the fountain of soda that will ensue.\nThis website has an explanation of why the reaction occurs the way it does:\nhttp://www.stevespanglerscience.com/experiment/00000109\nIf you are going for something flashier (but much much more dangerous) my chemistry professor used to do the thermite reaction, that was always popular.\nHope this is helpful!  :-)
466083
experiment is replicated. data anaylsis has more got to do with experiments than treatments.