Archive for November, 2009
Question: what acids does a lemon have that cleans pennies well.?
my science experiment is due tomorrow and im not sure why lemon juice cleaned pennies better than the other liquids.pleassse help me
Answer: Mostly citric acid (like all citrus fruits), some ascorbic acid (vitamin C – also like all citrus fruits)
!!!Cleaning Pennies!!! (?REALLY… WITH KETCHUP?)
Question: Introductory to chemistry. Experiment 12 need help?
my lab partner droped the class so i couldnt finish the lab. think you can help?
1.)Which of the 1.0g solutions is saturated?
1.0g NaCl or 1.0g NH4Cl? and what is the evidence?
2.Which of the 2.4g solutions is saturated?
2.4g NaCl or 2.4g NH4Cl? and what is the evidence?
3. which salt is least soluble at the elevated temperature? the temp is just hot water. about 85degrees.
oh there both are being added to 5ml of wate. and then are bathed into boiling hot water while in their test tubes for 5 minutes. then they are cooled with running water for 1 minute.
oh there both are being added to 5ml of water*. and then are bathed into boiling hot water while in their test tubes for 5 minutes. then they are cooled with cold running water for 1 minute.
Answer: I’m sure that the information about solubility of various compounds in water (and at various temperatures) is out there somewhere on the Net. However, we are missing something vital; the volume of water used. The real way to find out is to do the experiment.
However, and I’m guessing; NaCL is less soluble than NH4CL, I think, so the NaCL is more likely to be saturated. In hot water, I’m not sure at all.
To find whether a solution is saturated is simple. Shake the solid in the solvent (water in this case) for quite a while – at least a couple of minutes. If the solution is saturated, there will be some solid left at the bottom – it is extremely unlikely that you will have just enough solid to form a saturated solution.
So the evidence is; if the solution is saturated then there will be some solid left. Sorry, but you’ll have to do the experiment – unless you can find solubility figures, and even then you have to know how much water was given for the experiment. And even then, working it out is much harder than simply doing it.
Grignard Experiment Introductory Video
Question: A good title for a science project?
The question im trying to experiment is: Which diaper absorbs more water?
Answer: I would just make it exactly as you wrote it: “Which Diaper Absorbs More Water?” That’s a fine title.
I think the teacher and the judges will care more about how you did the main part of the project.
Baby Diaper Science