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Everything posted by person

  1. could you elaborate on the usage of a metal pipe ??
  2. person

    UV Rays

    Well that clear it up a bit thnx for all info and links!!
  3. Can i reduce zinc oxide with carbon powder ?? Well yes it is posible because i googled it but is it actuly posible for amature like myself ?? At what temp would the reaction start ?? Will the reaction give off enough Heat to continue the reaction like thermite eg can i have a mix of ZnO and C powder then just ignite with magnessium ribbon ?? The heat of the reaction will vapourise zinc produced ?? Any catalists that could help?? I am doing this to get zinc as the end product .is there an easier way to reduce ZnO ??? Thanx for any help
  4. person

    UV Rays

    Earlier this week i went on a school tour and i was sitting in direct sunlight for 3 hours on the school bus yet i wasnt sunburnt at all ?? I was wondering if UV radiation can pass through glass ??? If not then why?? Does it pass through water(i have been burnt wile swimming)?? Does infra red radiation pass through water or does it just get absorbed ?? P.S I live in south africa 3 hours of light is more than enough to get seriously burnt even now during winter!!! P.P.S thnx in advance
  5. i have made thermite using Al and Fe2O3 and it worked beautifully but i wonder... Could i use iron chloride as the oxidising agent instead of iron oxide ?? Will this work and if so how will it be different from Fe2O3 ? Will it ignite with the same amount of heat? Will it give off the same amount of energy ? Will the colour be different ? Any dangers (aside from the dangers of the normal method) that i should know about? thnx !! Any help appreciated !!
  6. In Stephen Hawking's "A Brief History of Time" he states that there may(should) be as many as 10 to 26 differant dimentions to space-time but that most are either infinitely small or millionths of an inch in diameter. Will someone please explain this to someone who has no grasp of dimentions past the 4th?
  7. Again, in Stephen Hawking's "A Brief History of Time" he states that he created a mathematical theorem that incorperated "imaginary" numbers to descible the possible expansion of the universe. The differance between "real" and "imaginary" numbers is that when one squares a real number, the result will always be positive(2*2 = 4 and -2*-2 = 4) but with imaginary numbers; the square is always negative. Hawking uses a variable to explain this(eg. "i") (i*i = -1 and 2i * 2i = -4 and so on). Please will someone explain the mathematics behind this.
  8. I know this is a physics question but the answer is mathematical. In Stephen Hawking's "A Brief History of Time" he says that there is an equation that explains how a particle will not look the same if one rotates it 360 degrees but it will look the same if it is rotated 720 degrees. Can anyone explain this equation?
  9. Well Thnx it makes more sence now!!!
  10. Does the "speed of light" change. I just had a thought .I know that sound waves go faster when going through denser objects!! does the speed of light change when going through denser objects??? If yes, what speed do we clasify as 'speed of light'(not the actual speed)when light travels through a vacume???? thnx guys!!
  11. how cold could "supercooled water be ? What is the limit to how cold it could be (before it freezes or something happens to it) ? There are some good videos on u tube of Supercooled water you must check it out if you have tome. Is there a way of making Sodium Acetate ?
  12. Im from South Africa and i went to one of the foctories that do it . Quite an interesting process but they didnt give any proper info > they said it was a company secret but i think the guide just didnt know
  13. can i add Cu salts to gunpowder to make the flames Blue or lithium for red ?? can i make gunpowder with KClO3 minus the sulfur i know
  14. thnx guys i might consider working thing out by myself now
  15. thnx shade !!! so 7.999g O2; V=m/M x Vm V=7.999/31.998 x 22.41 V=5.602 of what unit ???(liter??)
  16. why must there be no sodium present for Pyro ?? does the sodium flood the colour with yellow!!
  17. What formula can i use to determine the volume of gas per x weight ??
  18. ok i have never done this before (because im 15 and a lazy bum that thinks chemistry is awesome) so bare with me and pls correcrt me !! 1 mol H2O2 = (2x 1.0079 amu)hydrogen + (2x 15.999 amu)Oxygen=34.0138 grams therefore for every 34.0138 g H2O2->18.015g H2O+ 15.9988g O2 So for a 50 % conc(by weight???)H2O2 (50%x 18.015)H2O + (50%x 34.0138)H2O2-> 18.015g H2O +(50%x15.9988) 7.9994g O2 therefore(50%) 26.014g H2O2-> 18.015g H2O + 7.9994g O2 I want to check the gas laws Quickly and see if i can work out the volume per mol O2 let me Know if the above is correct !! thnx !!
  19. correct me if im wrong but could he not use a strong acid and then buble the gas through water to remove acidic vapours ??
  20. decomposition with manganese oxide ? what would the rotio of gas be to water at ,say 50% H2O2
  21. thnx alot i have KCl now so i will just make KClO3 and filter that out!!
  22. sorry stupid moment !!! is there a easy way to determine the H2O2 concentration ??
  23. is there a big enough differance in solubility to use "fractional crystalisation" ? and secondly i dont realy have acess to Pb or Au -NO3
  24. how exactly do you evaporate off the water??
  25. i was wondering if there was a way to seporate sodium chlorate i made from the leftover salt by the big melting point difference in the two substances:rolleyes: concidering that; 1) would the chlorate decompose 2) how would i filter the solid out 3) is there a way to stop the chlorate from decomposing Any idea ?????
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