Chemistry

I am a GCSE student and I don't understand Electrolysis, I need to know this for my exam! Help would be much apperciated! Thanks

Hi, I'm currently in the process of designing a product. It needs to work like invisible ink, but instead of reacting to UV light, I need it to show up when exposed to a normal bright light source. For instance if this clear ink was used on a bottle, text would appear when in it is taken out of its packaging and exposed to a normal bright light source. However,it would need to be removal by perhaps a special type of wipe/remover or other quicker alternative methods. Any comments or suggestions would be greatly appreciated. Thanks

Not sure if have written this is right place, but does anybody know why stronger gels are more brittle? I have read this fact in many places but no explanation for it!! Any help would be soo appreciated

Hi. A liquid crystal display has indium? transparent traces that make the electric contact to the circuitry and enter the glass sandwich to turn on the segments, and a couple of the traces seem interrupted. Is there some simple easy-to-find liquid that I can apply with a (nail painting) brush to those traces to restore electrical path, and stay conductive after drying? Does not need to be transparent, the available silver inks to do the work are more expensive than the item to be repaired, and I would use a 0.01% of the bottle. Not worth it. Thanks, Miguel.

So, I've got an electric ice cream maker. Love it. The ability to make your own combinations far exceeds anything offered by Ben & Jerrys (IMO). Just mix the ingredients, pop them into the chiller bowl, and turn it on. 20 minutes later, homeade ice cream. I can also make slushes out of juice, or frozen margaritas and daquiris in it, which totally rocks, but I've been working on my ice cream recipes. Simple vanilla is still a top player, but I've also done well with chocolate chip mint, and I experimented with a chocolate cinnamon swirl with hot chili powder that came out nicely (although the girlfriend didn't much care for spicy in her chocolate like I do). …

:confused:I'm not quite sure whether this is the right place to pose such a question, however I'm rather interested, but what common methods of analysis, are available to test the chemical composition of various stones. So far, I've come up with acid testing, which can be used to identify the presence of carbonates and sulfides. Density, streak- test, and the like could be used as well, however they are not so conclusive and concrete, rather, formulating a guideline. Any help? I was thinking of using this type of data to contrast the chemical features and composition of soil and bedrock, and contrast it to the flora within it. I know I've mentioned some methods for s…

I am new to the field, so have been trying to find out about Earth's reduction potential. I couldn't. So maybe you know the answers to following questions : Earth reduction potential: - does it have a single one (or maybe it differs depending on a location) - if it does have one, what is it? (in mv) - does it differ in natural pools of water (Rivers, Oceans, lakes)? - anything about natural Earth's reduction potential?

hey all i was listening to my uncle talk about a dive he did off the coast of australia not too long ago. He said in an underwater cave below sea level there was a chimney shaped area which had an air pocket at the top of it. as the divers passed through the cave the expelled air rose up the "chimney" and into the pocket. Having dived in this cave many times over the years, and after speaking to many other older divers, my uncle found that the air level in the cave remained constant. Again, the cave is under sea level. Does this have something to do with pressure and the oxygen re-entering the water?

The difference between the boiling point of methane and chloroform. Methan's boiling point is -164 C and chloroform's boiling point is 62 C. Explain the difference between two boiling points. I do not get this question at all and really need help answering this particular question. Both the CHCL3 and CH4 have the same shape....but how does that affect their boiling points.

Hi I'm currently at university and have a set of results for an experiment which involved polycaprolactone particles treated with sodium hydroxide. Size range 10-30 micrometres. Buffer PBS. I found the zeta potential to be roughly 5mV. But with NaOH treatment and PCL i expected results to be negative. I am so confused, can anyone please help or refer me to where I can get help? Thanks

why are all the metal oxides insoluble in water... and is that the reason why metals generally form hydroxides in water instead of oxides... i.e. 2Li + 2H2O > 2LiOH + H2 not 2Li + 2H2O > 2LiO2 + 2H2 Merged post follows: Consecutive posts mergedah ok i know why hydroxides are more favorable then oxides.. why should a metal, i.e. lithium, have to share its oxygen with another lithium, when it could share it with a hydrogen, which doesnt reduce oxygen's oxidizing power as much, allowing oxygen to be a stronger oxidizer to lithium... forget i posted this post

ok im not going to lie i love the study and experiment with meny menny drugs to experience the effects and deffects of them. And the was this one drug... probably the most amazing experience of my life and it was pure Dextramethanol. DMT. and i was wondering how dose someone extract DMT from substinces such as day quil and night quil.

i am a biologist but i would like to determine the content of cadmium and arsenic in onion bulbs using the AA spectophotometeric method...My main problem is digesting the onion bulbs. i would not mind getting any useful information or procedure. thanks

As many know from experience, single and double displacement reactions, are a common way of synthesising needed, and/ or interesting compounds. In this, a knowledge of the activity series is required, however, I have run into a problem: where on the activity series, would one place ammonia, or rather the ammonium ion? It was is one of few nonmetal cations, and as such, would belong on the metal activity series, but where? Any thoughts?

may be i am asking the foolish ques. but these ques. is really disturbing my hypothalamus . we are all familiar with nuclear reaction . the most familiar one is the one with uranium . it changes to thorium, radon , polonium , radium or.......... depending upon the type of decay either its alpha, beta or any other . now if we take not elemental uranium but its oxide which is widespread then how stiochiometry will be maintained i.e there may be formation of oxides of thorium, radon , polonium , radium or.......... , but from where oxygen comes ????????????:confused::confused::confused::confused::confused::confused::confused::confused::confused:

is there an easy way to extract Mg from Mg(OH)2

1.A 78.6-mL sample of HCl(aq) is diluted to a volume of 500.0 mL. If the concentration of the diluted solution is found to be 0.393 M HCl, what was the concentration of the original solution? 0.0786 L x 0.393 M = 0.500 L X ?M solution is 0.0618 M HCL is that right? 2.Assuming the volumes are additive, what is the [NO3-] in a solution obtained by mixing 174 mL of 2.50 M KNO3, 218 mL of 0.750 M Mg(NO3)2, and 145 mL of H2O? anyone show me how to do this question?

ok, follow my reasoning: hydroxide is more reactive then oxygen proof: calcium oxide reacts with water to form calcium hydroxide iodine is more reactive then hydroxide proof: calcium hydroxide reacts with hydroiodic acid to form calcium iodide and water oxygen is more reactive then iodine proof: hydroiodic acid is oxidized by air to form iodine and water so, wheres the flaw? hydroxide makes a better ion then oxygen, iodine makes a better ion then hydroxide, and oxygen makes a better ion then iodine...

i am building a rocket and would like some help with fuels and oxidizers. i know the standard KNO3 with sugar, but i have managed to find a supplier of KClO3 and i thought this would be better as it releases 3 moles of oxygen per mole when thermally decomposed, a lot better than KNO3's meager 1 to 1 ratio, any thoughts? does anyone know what would be a good fuel to replace sugar providing more energy or gasses but still be safe? i was thinking coal dust but i cant balance the equation as i don't know its molecular formula or work out how much energy per mole would be released. dont be too mean im just a shed scientist!!! also any tips on rocketry would be high…

Reading over an old thread, I found a fact that I haven't really thought of juxtaposing in to my vast array of ideas for synthesis experiments. Knowing that hydrogen is more active a "metal" than copper, could one not perform a displacement reaction forming sulphuric acid, by bubbling hydrogen gas, in a solution of copper sulfate, the result would then be sulfuric acid (as I before mentioned) and a copper precipitate. Would such a process work? In theory yes, but I have several doubts due to practical issues such as hydrogens lightness. Thoughts?

i need some HOCl for an experiment I'm very interested in. Anybody know how I can make this? I can get NaOCl, NaCl, H2O2, MnO2, HCl, NaOH, MgSO4, NaSO4, electricity, and other common materials. And please don't suggest bubbling chlorine through water, it will not work for the experiment I'm doing. Merged post follows: Consecutive posts mergedwould acetic acid(CH3COOH) + bleach(NaOCl) yield sodium acetate(NaCH3CO2) and hypochlorous acid(HOCl) ? if not, does anyone know any similar reactions that would make HOCl? Merged post follows: Consecutive posts mergedahh! these chemistry threads move so slowly... In any case I have concluded that the only wa…

i happen to have a good amount of these disinfecatry tablets which are 33% bromine by weight, as they release HOBr and HOCl in water... anyways, is there any way to extract bromine from HOBr? i have two ideas in mind- one is two electrolyse it- [ce]HOBr -> H^+ + OBr^-[/ce] [ce]2H^+ + 2e^- -> H^2[/ce] [ce]2OBr^- -2e^- -> O^2 + Br^2[/ce] one is too react it with hydrochloric acid- [ce]HOBr + HCl -> H2O + BrCl[/ce] except i don't know what to do with BrCl, although its boiling point is pretty high, 5 degrees celsius, so i could make it liquid basically what i want to achieve is something like this

I'm sorry if this is the wrong section, perhaps it belongs in physics, but how cold is ice + salt + water? I'm wondering because most of the places I look it says like -10 degrees, which seems about right if you use the freezing point depression equation. However, I was easily able to condense a drop of chlorine (I'll get a better picture soon, but here), whose boiling point is -35 degrees celsius, -30f. I used water + ice + a good amount of magnesium sulfate and sodium chloride. I think maybe because I used two different salts, i was able to circumvent the common ion effect... oh, and don't make chlorine.

I know i know don't make a thread if there is already one on it. There are plenty of acid threads all around still i haven't found one single thread on making a acid that can eat through stainless steel, carbon steel carbon fiber wrap Damascus steel .... can a homemade acid eat through any of this stuff? maybe a sulfuric acid or a hydrochloric acid ..

After looking at the Hazardous materials sticky, i realized that a lot of the things people make might actually be illegal. Does anyone know about the legality of these or other chemicals in the U.S. (or other countries)? Assuming they are all used only in good natured experiments... 1.)Chlorine 2.)Bromine 3.)Iodine 4.)Hydrochloric Acid 5.)Sulfuric Acid 6.)Nitric Acid 7.)Ammonium Nitrate 8.)Nitrous Oxide, Nitric Oxide, Nitrogen Dioxide 9.)Non-fluorine interhalogens 10.)Any other materials commonly mentioned here I know for sure most explosives are illegal (i.e. nitroglycerine)... i know drug precursors are watched (i.e. I2)... i'm not sure where th…