Chemistry

I am new to chemistry and this website and while studying the production of sulphuric acid, I came across 'equilibrium reaction'. I also came across 'reversible reaction'. So, I want to know what is the difference between reversible reaction and equilibrium reaction.

Would someone be willing to explain the common indicators for Ph of solutions? For example, does Litmus paper simply indicate QUALITATIVELY that a solution is either above or below 7.0 PH? Or is there some degree of QUANTITATIVE amount of color-change? How is Phenolphthalein paper used? And finally, my Ph-indicating paper changes color immediately, as the liquid proceeds upward through the test paper, but the color returns to original paper color, more or less orange, behind the advancing wetted area, which does change color for a short time, but then returns to orange. The instructions say check color within 30 seconds. Trouble is, within 10 seconds, the whole te…

Hey guys, I am doing a lab right now and I am totally screwed. I need an 8 on this lab or I am going to fail the course!! I've never got more than a 6.7 from my teacher so I really need a hero! We took lemon juice and put NaOH in with it and an indicator that made it go pink after average 4.37 mL of NaOH put in. It is 1.000 M NaOH. Lemon Juice pH reading was 2.40 Tap water pH after 4 x 30 sec. of blowing through it with a straw was 6.12 1) "Write the balanced equation for the neutralization of citric acid using NaOH solution." 2) "What is the stoichiometric ratio between citric acid and NaOH" 3) "Calculate H+ molarity, [H+] in mol/L in the lem…

Hi, I want to know why in an electrolitic proccess of the water, the hydrogen obtained is gas. I have seen liquid hydrogen, but I don´t know if is possible to get liquid hydrogen in a non-pressurized bottle.

give us some interesting/strange/wierd facts about uranium

Can anyone satisfy my curiosity about the way in which certain unstable compounds dissociate? For example, many nitrated compounds "explode" under appropriate circumstances. Are the results of such dissociation for a given compound always the same, or can differing results occur given varying physical conditions such as temperature, pressure, exposure to light energy, etc.?

Just two questions, 1. All different kinds of enzymes have a specific charge, right? 2. When the Isoelectric point of an enzyme is at 0, this is at its optimum for enzyme activity? Thanks

I think it's the wording of the question that has me so hung up on this question... A 200 mL NaOH solution was added to 400 mL of a 2.00 M HNO2 (Ka = 4.5 x 10-4). The pH of the resulting solution was 1.5 units greater than that of the original acid solution. Calculate the molarity of the NaOH solution. Can someone help?

I'm working on a homework problem, and the question is so vague I'm not sure how to answer it. The reaction quotient for a gas phase reaction has a value of 2000. If the number of moles of reactants in the reaction equation is equal to that of the products, which of the following statements is true? a. the reaction must proceed to the left to establish equilibrium b. the reaction must proceed to the right to establish equilibrium c. when the system is at eq., the concentrations of the products will be much larger than the concentrations of the reactants d. the concentrations of the products are generall larger than the concentrations of the reactants, e. none o…

As a Plant Engineer, I learned, the hard way, that fuel suppliers often ship a MIX of liquified butane and propane, selling it as "propane", because butane is sometimes less costly. Overnight temperature plummeted, the plant's boilers shut down, and I found the "propane" had frozen enroute to the building from two 30,000 gallon tanks. The supplier had missed the weather forecast, failed to ship the non-mix (propane only), and we were stuck. Butane "freezes" at a higher temperature than does propane. I wonder if others have encountered such fun? imp

Hi Guys, I was wondering if you get any precipitate from 2ml Lactose 3ml Lactase, and 2ml Benedicts. Lactose should hydrolyse into Glucose + Galactose. Will Benedict's copper(II) ions (Cu2+) get reduced because of the Glucose and precipitate? If yes, about how much of precipitate would I get in terms of milligrams with those kind of values. Also does light affect the speed of oxidation. If yes, would it apply to the chemical reaction that takes place with Bendict's solution and glucose?\\ Thanks

I have been searching for chemical related information on the web. I found http://www.chemicalregister.com, a Chemical Related website very useful. It offers a comprehensive online reference database of suppliers of products and services used in the Chemical Industries. It carries around 9,000 vendors in a copyrighted categorization of 50,000 products. It is an excellent resource for buyers.

Does any one know will NO2 react with silver tableware in an indoor environment?

Help! My Chem. text shows ethylene with it's 2 double bonds between the 2 carbon atoms, and 4 normally bonded hydrogen atoms, and says "ethylene readily combines with 2 atoms of chlorine, forming ethylene dichloride". What's troubling me is that the diagram showing ethylene dichloride has only ONE double bond joining the carbons. Now, is that not di-chloroethane? How does one know, or differentiate between ethylene dichloride which was derived from ethylene, and dichloroethane, which was not? In other words, are ethylene dichloride and dichloroethane the exact SAME COMPOUND? imp

Does anyone know how to make a bubble that bounces? By bubble I mean like the kind you blow, the soapy kind. Possibly something that increases the interior surface tension of the bubble? Glycerine?

ok, you can correct me if im wrong here i go. Household drain cleaner usually has a 90-94% sulfuric acid content, the rest is some water, i dilute the sulfuric acid making it a stronger acid. dilute sulfuric acid reacts with Zinc making one bi-product Hydrogen, so if i was to have a balloon over the zinc, when i pour the dilute sulfuric acid on it, will it not make the balloon fill?

Hi I recently tested out an air/saltwater battery. Without hydrogen peroxide the bulb dosen't light up. When i add hydrogen peroxide the bulb glows. How does it affect the redox reactions? Thank you

Some time ago I heard about Susumu Suzuki, that have been invented a water powered batterie. It seems not be electrolysis. You can find videos on youtube. But, recently I have seen a webpage who sell waterpowered products... Looking at the pictures, it isn´t electrolysis or hidrogen battery... is water battery... Anyone knows any information about it? I have thought to buy one and study how the battery works and replicate it. What do you think about it? http://www.ogormans.co.uk/water_powered.htm

I'm trying to find a search engine that allows me to use superscripts, subscripts, misc. in order to find information about certain formulas. For example, I've tried typing in [math][Cu(NH_{3})_{4}]^{2+}[/math]. I got some information, but I had to shove things around and figure it out. But for a majority of things like that, I can't find a good .gov or .org website to help me out. I don't want to buy tons of books, so I'm wondering if anyone knows of some good, very good, super-duper freaking awesome websites.

Anyone know where I can find the original papers for the Antoine, Rankin, and Nernst equations? (Probably not the Nernst equation you're thinking of.) Equations shown below. Thanks!

I really need help on this lab. it's a gr.12 chemistry lab, i chose the topic of how does the pH affect the rate of catalytic decomposition of H2O2, i'm using KI as the catalyst, and adding HCl or NaOH to change the pH. all we have to do is just the planning part, i need help on explaining why and how the pH of the mixture affect the rate of decomposition of H2O2. i know in order to speed up a reaction, you either have to have more collision of the particles to occur, or to have higher energy so that more of the particles would have sufficient energy for the collision to be successful. so how does the change in pH contribute to either of these? or there's other reason? …

why is salt more effective than sugar in lowering water activity? All the webby kept saying that salt have higher water binding capacity.. but doesn't states why.. I've been searching the net for like an hr. cause a+ binds to 6 H20 and Cl- binds with 5.. and they are ionic bond... that's what i find out only.. but how to compare with sucrose?

It is understood that when measuring pH using a pH electrode the temperature error from the electrode varies based on the Nernst Equation as 0.03pH/10C/unit of pH away from pH7. Now if Ph meter has Automatic Temperature compensation feature installed then shall it read same Ph at all temperaures for the same solution, whereas I have seen it does not, Ph does vary with temperature I am told that ATC takes care upto 0.03Ph/10C/unit of pH away from pH7, above that it is depicted as changed Ph. Thanks

Hi there. I apologise in advance if this question seems stupid and simple, I am very much a novice at this and I couldn't find any site that had the answer I was looking for, or at least not in a manner I could interpret. In regards to electron configuration, I understand that the order of shells and orbitals is in the form 1s 2s 2p 3s 3p 4s 3d 4p etc.. however there is something I don't understand. Take for example the element Krypton. Going by the order of electron configuration it would seem the element should have the configuration of [Ar]4s2 3d10 4p6, yet every site I check it seems to have the form [Ar]3d10 4s2 4p6. I am curious as to why the 3d10 app…

I am having trouble explaining how carbon atoms are counted for the carbon-12 weight standard, could anyone help?