Recent questions tagged chemistry

Description : What can cause hot food in the pan (on stove top) explode? See detail.

Last Answer : Water explodes when added to hot oil.

Description : Is Wikipedia wrong about the half life of Gold?

Last Answer : This just means that the various radioisotopes of gold are pretty unstable.

Description : Will borax dissolve in oils?

Last Answer : No, I don’t think so, since it is a sodium (salt) compound.

Description : Hello! I need help with chemistry and FAST PLEASE!

Last Answer : At STP?

Description : Chemistry question? (Gas Laws)

Last Answer : P1V1/T1=P2V2/T2

Description : Is it more likely to get a sunburn under the ozone hole in the South Pole?

Last Answer : Maybe, but who’s going to lay out in a bikini just to find out?

Description : Would you find the cotton on Q-tips as it was when it went in, or would it disintegrate after a very long time?

Last Answer : answer:You mean if some cotton got stuck in the wax inside an ear? It would come out with the wax and/or water from showering etc eventually, unless the wax flow got blocked, in which case it'd be ... more like a drawer than a compost heap, and that it'd tend to get cleared out before it decomposed.

Description : Why can't Mg(OH)2 act as a buffer?

Last Answer : http://www.jiskha.com/display.cgi?id=1427999118

Description : When wood burns, where does all of the physical matter go?

Last Answer : Most of it gets turned into gas. That is the smoke that the fire produces.

Description : Are there harmful elements to humans or pets in glitter?

Last Answer : Everything you want to know about glitter is here. It's probably plastic, but maybe not. Either way don't inhale it. Even the companies selling glitter capsules and suggesting you can shit glitter poo have labels ... be consumed. But that's because we love to sue each other. I bet your cat is fine.

Description : Does the statue of liberty need to be polished? (Details inside )

Last Answer : answer:Yes, they could. Copper (when near oxygen) eventually makes the chemical copper oxide, which has a greenish color. That, and carbon in the atmosphere, eventually turn into copper carbonate. The copper ... statue by exposing raw copper, and finally because it would cost a hell of a lot to do.

Description : How long will the milk remain unspoiled at 20C?

Last Answer : I don’t know what course you are taking, but spoilage is not on a constant rate of temperature and time. All I know is milk goes sour in ½ half day at room temperature. 20 C is room temperature.

Description : What are some soluble compounds of gold?

Last Answer : Gold Chloride is very soluble in water. Gold Sulfate is moderately soluble in water.

Description : Can you help me convert from nanomoles/liter to picograms/liter?

Last Answer : Usually you can just type an equation into google and it solves it, but here is a picogram converter that has what you need.

Description : Can someone possibly explain or summarize the chemistry in this electrolytic cell patent for me (see link in details)

Last Answer : answer:This is a pretty complicated patent, more complicated than could easily be explained/summarized here (at least without writing a volume nearly as long as the patent you've linked). I recall learning about this ... about it I may be able to help, but there's a lot there to just summarize it.

Description : Calculating molarity.... am I doing it right?

Last Answer : answer:I’m sorry, I’m having trouble following your solution with your abbreviations. What do you mean by mg? Milligrams? Moles per gram? Grams per mole? What do you mean by mass wt? Mass weight? What does that mean? Do you mean molecular weight? Sorry, I haven’t done chemistry for a while.

Description : Can anyone easily explain mole metric conversions? I'm not understanding Avargados number in relation to a mole?

Last Answer : another thread on this topic: http://www.fluther.com/73973/can-someone-explain-moles-and-osmoles-to-me/

Description : Several questions about pH...

Last Answer : answer:The wiki provides… pH maybe start from there and then someone can clarify the confusing or non-factual portions where further explanation might help?

Description : Does this chemistry thing really work?

Last Answer : answer:Do be careful. We don’t want you blowing up or blowing off any important bits. Can you put it far, far away in the middle of a field and then shoot a flaming arrow into the mixture?

Description : Fellow fluther chemists, and/or machinists, how would you solve this?

Last Answer : answer:Depending on how sharp the curves are in the tube you might be able to get the rest of the blockage out with a power drill and the proper bit and speed using a flexible shaft attachment similar to ... want to tape some heavy guage wire to it so you have more control. Anyway, just a thought.

Description : What is the unit for reactivity?

Last Answer : answer:http://en.wikipedia.org/wiki/Reactivity_series Do you mean the expression in an equation of the reactivity of an elemental metal? I think you can find it on this page in Wiki.

Description : What is the most amazing looking chemical reaction?

Last Answer : answer:My two chemical reactions are very simple. They have no fancy chemical names, but they have both worked for generations. 1. To place a tablespoon of baking soda into a cup of vinegar and ... of the milk bottle. The preceding was brought to you by the JP Institute of Simple Chemical Reactions

Description : When is carbon-14 dating impractical?

Last Answer : Carbon 14 dating is only useful up to about 60,000 years because of the half-life of C-14. For example it’s useful for archeological sites. It’s not useful for dating dinosaurs.

Description : How is chemistry used in firefighting?

Last Answer : A knowledge of chemistry would certainly be useful when fighting chemical fires and other toxic spills, no?

Description : What's a misconception you've had in Chemistry?

Last Answer : I thought it was hard, but it wasn’t.

Description : How are groups and periods classified in chemistry?

Last Answer : answer:The periodic table rocks. While we do not do homework here I want to encourage you to explore it. Each element has a history and unique properties. This is just one of many awesome sites that can help you appreciate and understand the elements.

Description : Is it true that reactive oxygen species (ROS) have only one electron and that causes them to be unstable and thus try to grab an electron from other molecules?

Last Answer : answer:You're close, but it's not that they have one electron. Usually they need one electron (you can have species that need more, but one is more typical). The Reactive' bit comes from the ... unpaired electron, by the way). However, 7 is the most common and tends to have the higher reactivity.

Description : Who wants to help me on my late chemistry homework?

Last Answer : answer:depends on quality of harvest ridiculously stupid and unsustainable due to necessitating appropriation of croplands or destruction of rainforest. limitations are how much space do we have to grow shit on? not enough already! Brazil, for one. how many plants? you joker.

Description : How do I know what physical states I should use for different organic compounds?

Last Answer : answer:look in the textbook at the states in which the compounds are labelled in example reactions. They are extremely unlikely to be different in an exam. If they are, it will be a A* mark ... will just be mostly intuitive but then, most people never get a feel for organic chemistry hahahah.

Description : What does it mean in chemistry if something is in excess?

Last Answer : There’s enough of that chemical present that the reaction will completely “use up” the other chemical first.

Description : Principle Chemistry Questions?

Last Answer : answer:So what do you think you should do next? (If you were hoping to get the answer I am afraid you are on the wrong site.) So start the process…

Description : Why is the light "chopped" into pulses in AAS?

Last Answer : answer:HCL's require very high voltages to operate (a quick search found 500VDC as typical). Rather than convert household voltage (~120V) to 500V directly via a transformer (which would be ... the 120V potential. More on the step-up circuit here: http://en.wikipedia.org/wiki/Boost_converter

Description : A reaction between the substances A and B has been found to give the following data: 3A + 2B -----> 2C + D?

Last Answer : My reaction is “HUH??”

Description : Can someone explain moles and osmoles to me?

Last Answer : Okay, let's start with something you are familiar with: a dozen. It doesn't matter what the items are, if you have a dozen of something you have twelve. Now let's say you want to make 2 dozen cupcakes. A ... help? (It's late at night, I'm going to reread this in the morning to see if it makes sense)

Description : What is that snowlike substance that occurs in Pepsi when you freeze it?

Last Answer : Snow.

Description : Can the Percent yield be more than 100%? Why?

Last Answer : No, I will not stoop to doing your homework in exchange for lurve.

Description : With hydrocarbons, is chlorine the ONLY atom powerful enough to remove a hydrogen atom from an alkane?

Last Answer : (Disclaimer: I had organic chemistry 10 years ago, so you may want to back this up with some googling) Flourine reacts with alkanes, but it is so reactive it is unpredictable; you don't know ... . It seems like you can get the more powerful acids to react with alkanes under the right conditions.

Description : Brain Teaser: How well do you understand weighted averages?

Last Answer : I think most people do understand weighted averages, they just don't know that they do. Is there any difference between the problem you wrote and this problem?: If 5 students score 10 points on a ... again, I've never understood exactly what a weighted average is. is the answer 3 liters/students?

Description : Properties of Covalent Compound ?

Last Answer : Fluther isn’t in the business of doing your homework.

Description : Reaction of decomposition of hypochlorite?

Last Answer : @Hannah88 Welcome to the collective. The huge absence of answers to your question is because Flutherites don’t like to do people’s homework for them. If you can edit your question to show that you are working on the answer and are perhaps just stuck and needing a pointer that might bring help.

Description : When talking about the periodic table, what are the trends of precipitates as you move down the column of alkaline earth metals?

Last Answer : Homework, eh? :)

Description : If the atomic number of an element increases, then density will increase as well because...?

Last Answer : Not necessarily—(although generally so)—Lead (82) is less dense than Osmium (76) at STP. Mostly because, “it’s complicated” =)

Description : What happens when I treat benzene with chlorine and water?

Last Answer : It creates chlorine gas, which is very toxic. may I ask why you are asking?

Description : Using the electrochemical series, how can I explain why manufacturers coat steel nails with zinc rather than copper?

Last Answer : Because the use of zinc is…......... Nah you do the work , or its called cheating :P

Description : Is KOC(CH3)3 equivalent to KOH as a base in chemical equations?

Last Answer : This depends completely on the equation in question. For instance, both are strong bases, so if that's all you're worried about, yeah, they're about equivalent. But potassium tert-butoxide is way bulkier ... not in others. Those are the big differences that jump out to me, but there may be others.

Description : How many chemicals are there in a marijuana joint and in a cigarette?

Last Answer : I know this doesn’t address the chemical part of the question, but as for your last proposal, they do not produce the same effect. Thereby, I don’t think it would be a good substitute. However, I’m not bashing the idea of it being a legal option…

Description : Why is PbI2 precipitate yellow?

Last Answer : Colors are a fairly complicated subject. Essentially, a molecule or compound will be a particular color due to numerous factors, but it comes down to what colors are absorbed and what colors ... you might!), for instance Colbalt Chloride is blue: http://en.wikipedia.org/wiki/Cobalt%28II%29_chloride

Description : Can you explain the Haber-Bosch nitrogen fixing process?

Last Answer : Here is the most complete description of the reaction that I've found. Yes, ammonia (NH3) is the end result. First, hydrogen is derived from natural gas by another process (described in the ... and hydrogen which allows them to combine with less total energy than they would need to combine directly.

Description : Shouldn't H2O be in liquid state after hydrogen and oxygen react?

Last Answer : Never mind, I figured it out: When hydrogen burns in oxygen it produces water in some form and heat. Now what form would the water take if it were really hot? A gas. Now, what will the water ... phase after the reaction. And most of the water really will condense to the liquid phase as it cools.

Description : What is more reactive, Lead or Hydrogen?

Last Answer : Lead(Pb) . I just asked my chem professor.