Kids nail in salt water experiment not doing anything.  Why?
350950
Unfortunately, I don't really have much information on this subject.  However, a galvanized nail (Galvanized is a protective layer around the outside of the screw to prevent rusting, or basic contact with the 'elements.') probably is the reason that the experiment is failed.  When will they start producing specific projects for these kids!?  Geesh.
679991
It is the drying of the salt. Try spreading a thin layer of Vaseline over the annoying spots before heading in to the water.
750811
Your question makes no sense.\nIf I understand correctly you are making artificial sea water by making a solution of KCl, HNO3,Hg(+2), then you are adding Pb(+2) and Cd(+2) to known concentrations... measuring potential (what method?) and you want to determine the concentration of...what? You know the concentrations of all species (unless a reaction is taking place)
752801
Check out the projects on this website\nhttp://scienceclub.org/kidproj1.html
857117
Run a borax bead test...for info see:\nhttp://en.wikipedia/wiki/borax_bead_test\n\nOr, iron ppts out as its hydroxide...a flocculent ppt... in basic soln, while sodium does not. Dissolve some in water and slowly add NaOH soln, watching for ppt.  This is only good if you are CERTAIN that spl contains only Fe or Na.
708632
Let them set out in the sun and see if either leaves a residue.  If a residue is left, then it is a mixture.  Something like salt would be left as a residue.
1071764
it would travel the same 2 inches that separate the prongs on the stun-baton. salty water is perfect conductor of electricity.\n\nif you want to achieve the effect of lightning striking the ocean, you would have to find a way to stick only one prong of stun-baton into the water.\n\nif you want to get some fish, you can stick two electodes into the water like 10 yeards apart, and connect them to a better source of electricity (like welding arc generator). But then again, TNT is easier.
184534
Grab a penny and a dropper. Cant think of whats its called but it is like a n eye dropper. You can use an eye dropper but you'll have to only use that one for ur expiriments will have to have the same conditions. Anyway insert the liquid of choice into the dropper and one at a time slowly begin to drop drops of the liqiud onto the center of the penny. Because of the water surface tension it will for a little dome over the penny. record your results for when the water surface tension breaks. switch between liqiuds. Go on from there. Hope it helps you out
773978
Yes.....apply an electric current to salt water...I think this is the actual commercial method.
253095
Did you try boiling water?
738402
Attach a bare wire to each terminal and dip the ends of both in salty water. Bubbles will form near the wires as the electricity breaks the water and salt molecules into their constituent gaseous elements. \n\nBy the way, with salty water you will get hydrogen and chlorine, but not oxygen. The salt is needed to make the water conduct electricity, but it also prevents you from getting oxygen gas from the water. You can do this experiment without the salt, but you will need WAY more than 9 volts. In that case you would get oxygen.
676507
because sea water has a salt concentration in it, and it is corrosive, similar to an acid but not as destructive. and saltwater will kill plant life harming the surrounding enviroment. they do but they also have salt water filters on the firboats to help bring the salt concentration down.
61365
yes it does, and if you want to show off and try something cool, pour salt water into a beaker or glass, then pour fresh water on top of it, then place an egg in. It will "flink"
399666
Because they cant breathe in water. Drop one in a bucket of water and see how long it is before it dies.
1051025
The question is too open. What experiment are you talking about? If you google science supplies you might find out, although since it's homework most people won't just give you an answer.
147233
, you can´t make seawater with regular salt because of the contents but if you want to make a equivilant it would be 2/4 cups of salt and 2 cups of water\n \nHere are some other facts for your sister to use in her writen report of the project.\nSeawater has one of the most stable constitutions, varying only in a few places in its 77% coverage of the earth's surface. This factor makes keeping marines more difficult than freshwater species as the fish involved have little tolerance to changing conditions - they never encounter any - but, advantageously it means that all marine fish will be at home in one common type of water. \n\nExcept for those few aquarists who have access to natural tropical seawater, the majority of marine fishkeepers have to rely on preparing their own synthetic variety using commercially-available salt mixes.\n\n \nTo make sure the water is mixed to the correct conditions, test the 'strength' of the mix by measuring the Specific Gravity (S.G) of a sample. \nIn Nature, this approximates to 35 ppt (parts per thousand) or, in practical terms 35 grams of salt per litre of water, approximately S.G of 1.025; in this example, the S.G of the sample reads 1.024 which is satisfactory for a reef tank but could be lower (1.021-1.023) for a 'fish only' collection.\nIt is important to measure the S.G. when the water is at the correct temperature (75oF) and thankfully most hydrometers offered at the aquatic outlets are calibrated at this value. \n\n\n\n\nSynthetic seawater should be mixed in clean plastic containers and aerated for at least 24 hours before use.\n\nOne of the curses of the marine aquarium (not helped either by the intense lighting found on most systems) is unwanted algae; this is further encouraged by phosphates and nitrates found in the water used to make the seawater. \nAlways use a salt-mix that is labelled 'phosphate and nitrate free' and also make sure that water used is also free of these substances too.\n\nSource water can range from absolutely free of anything tapwater (via Reverse Osmosis treatment), nitrate removed by a Nitragon unit or phosphate removed by using RowaPhos(tm) in a filter.\nAdditionally, clean rainwater can be used.\n\nNitrate levels can be kept to a minimum im the aquarium by the action of use anaerobic de-nitrifying bacterial colonies within Living Rock, and by regular partial water changes. The build up of nitrate can also be minimised by using a protein skimmer to remove organic substances from the water before the nitrite-forming and nitrate-converting bacteria can get their hands on them. \n\nKeep a check on pH and nitrate levels: rising nitrate levels and a falling pH means it's time for a water change. Whilst nitrate levels in a fish-only collection can be allowed to rise, invertebrates appreciate really low levels (zero, preferably
230825
Teach them how to demonstrate centrifugal force by taking a metal coathanger, holding on to the hook and pulling the center of the straight part so it looks like a skinny oval with the hook on the bottom, put your finger in the end of the skinny loop away from the hook and hang the hanger on your finger so the hook is down, then balance a penny on the point of the hook and carefully spin the hanger around in a vertical circle.  The penny will stay balanced on the end of the hook.  Believe it or not, this works and if you practice it it's easy - you can even stop the coat hanger without losing the penny.  Try it!