Is chalk in water dangerous?
458904
Well,if CaCO3 + 2H20 = Ca(OH)2 + H2CO3\n\nthen the products of chalk in water are:\n\n(1) Calcium hydroxide (Ca(OH)2) and carbonic acid (H2CO3)\n\nThis is an exothermic reaction: it gives off heat.\n\nFurther reaction between Calcium hydroxide and the carbonic acid produces Calcium bi-carbonate (Ca(HCO3)2) and water (H2O). \n\nCa(OH)2 + 2H2CO3 = Ca(HCO3)2 + 2H2O.\n\nCalcium bicarbonate is baking powder, and it is safe, and even medicinal as an antacid.\n\nThe feasibility or otherwise of the above chemical reactions is now left to chemical thermodynamicists to confirm, while the speed or sluggishness of the reactions is for kineticists to compute.
640579
yes, huge vibrations are deadly, especially sound waves travel faster in water..
161784
The quick answer is yes, it can.  Any dust can damage computers.  Most schools have moved toward removing chalk boards and replacing them with white boards for that very reason, and also to protect people from the effects of the dust.
621241
i wouldn't recommend swimming in nature right now. a lot of debris was blown all over the place, and they're still cleaning it up. you could get hurt badly by something submerged under the water, like metal or a broken board, glass, etc.
803826
Very very dangerous. Potentially fatal.
343568
Its not.  What you see on top of water is hydrocarbon polution.  most really deadly polutants such as hexa valent chromium deposit in the river bed or lake floor and continue to contaminate the water for several years.
158608
Yes, water intoxication is quite deadly. its a condition called hyponatremia.If you consume large amounts of water , blood plasma (the liquid part of blood) increases thereby diluting the salt content of the blood.  At the same time, your body also loses salt by sweating.  Consequently, the amount of electrolytes available to your body tissues decreases over time to a point where that loss interferes with brain, heart, and muscle function!  You have to replace these electrolytes!  They're essential to the normal electro-chemical operation of your nervous system.
1166261
It will always depend on teh source of fresh water.\n\nContmination is a big factor in answering the harmful part of the question.\n\nRunning water is safer but not 100% safe.\n\nAs long as your using a clean and reused drinking bottle you should be fine on that end.
577808
The water in rivers might be unsanitary.
1186501
You must be kidding but anyway  I think you should check this web site www.upstate.edu/poison/kids/billie_cd_script.php - 21k - Cached - Similar pages\nCleaning products can harm you if you eat or drink them,or if you splash them in your eyes or mouth .Drinking windshield washer fluid could kill you. Don't touch! ...
287700
If the tester is beeping then yes it is over the safe limits.  Can you dip the tank and get a sample?  If it is high ph as you indicated then that is somewhat better than acidic.  It should be easier to deal with.  However, if that tank has been sitting for 30 years it should be considered hazardous.  There is no way of telling what time has done to the chemicals in it.
887802
I sure hope this is just a paper exercise and is not going to be actually performed.  Sodium hydride will react very exothermically with water and is extremely hazardous.
570622
baby powder or weight-lifter's/rock climber's chalk should work just fine - my feet get clammy and slip, too . . .
1114670
No basis for this one other than after you eat, your body typically shunts blood to the digestive tract and away from the brain and skeletal muscle.  With physical activity this shunting would be over ridden, POSSIBLY, MAYBE precipitating a cramp.  I have never heard of it actually playing a role in any water accident.
627183
Now thats a weird experiment. Firstly, most of the ingredients in Coke are Inert. But however, since it is carbonated, and has mild levels of disinfecting chemicals, it has a slightly acidic nature. Now when you drop nail filings (which are mostly calcium compunds) there is a chance that they react with the acidic solution. But the least that can happen is a soft neutralisation process and nothing else. So there is no chance that you will fall in coma when you drink such a mixture.
1091960
the chemicals in the paint are horrible, they definitly get u light headed, make sure its aired out etc, too much inhaling can definitly get u sick!
251089
I can't remember the mineral, it is there in my small little brain but I can't find it at the moment. Any way, the mineral is mixed with corn starch and formed into sticks under pressure. The corn starch prevents the powdering that causes chalk dust, but is still soft enough to allow the chalk to write on slate, etc.