Chemistry

Ok theres a project in my science class at school called the Ice Box project. The goal is to create an icebox (without just buying a cooler) that holds ice in it for 24 hours. I was thinking about using tinfoil and stuff but im lost. Any ideas?

I bought a job lot of glassware and in it was This: http://myweb.tiscali.co.uk/yt2095/experiments/dunno1.jpg http://myweb.tiscali.co.uk/yt2095/experiments/dunno2.jpg http://myweb.tiscali.co.uk/yt2095/experiments/dunno3.jpg anyone have any ideas? it`s marked with 2 lines, 12.5 and 25 and Cm^3 20oC

I'm new here so I hope I posted this to the correct forum. My brother put some iceblock trays in the freezer one night. The next day he was surprised to find this in the tray. How does this occur? The front "stalagmite" contains bubbles, and we were thinking that has something to do with the formation. But I would really like to know the definite reason as to why this happened. Thanks, Dave

Hey! I am doing a titration and I need to find out what the pH is. I need to combine sodium acetate and acetic acid together. What are the products of this reaction... is it water and what else????

Hey! I was wondering what are a couple of buffer systems in our everyday life besides our blood????

hi i am interested in wither or not a cold flame is possable, i concluded that were it possable the flame would have to be endothermic (takes in heat energy from its surroundings) and despite researching through all the books at home at my old school and my colledge i found nothing on the subject, and so i turned to the internet for gidance and all i found was many pages on the quenching of a flame using an endothermic reaction. thank you for any useful input on the matter.

So, I'm in grade 12 chemistry and I am not sure how to do chemical equations. This may seem strange to some, but it is due to not having any prerequisites in chemistry as I have decided I wanted to take it after discovering my affinity for science through Biology. With that said, I am at a great disadvantage and the course is looking very bleak at the moment. Anyways, I understand how to balance equations, but it is obtaining the equation that is difficult for me. Once, I am able to create one I should be able to do everything else. Anyways, here's what I got: Distilled water and Potassium Hydroxide Ionic Equation: H2O(l) + 2KOH(s) → 2H20 + K20 Full Ionic Equation: …

i found this in a website http://woelen.scheikunde.net/science/chem/exps/copper+zinc/index.htmlbut cant figure out how to do it. One question is what is a "spatula full" i tryed googling it but nothing and i dont think they mean a large spatula. Also i did not heat it up to much (dont have a glass beaker yet) but i would say it is 80F ish. Any idias? thanks

ok i can guess that this will be answered in a few seconts . But for years i have tryed electrolysis with water but all i ot was little bubbles. i think it is the source i use. i use a 9 V battery. What voltage and amprage should be ok to get max h2 and o2 production. Thx

the Arrhenius Equation ln K= constant - Delta H/(RT) What is K? Equilibrium constant of pressure or equilibirum constant of concentration? And I sometimes see that it is employed to find the activiation energy, so how things work? Thank you for your attention.

Is the only difference between the two is; experimental error uses significant figures and percentage of error doesn't?

What would happen to the volume and pressure of the gas if it reached absolute zero?

A temperture change of 1 K is equivalent to a change of how many degrees celcuis?

Hi, I am asked to prepare a sample of the gas hydrogen selenide with various matrials and equipment. I have an idea how to go about it but need comfirmation. I also need a description of th experiment, so I need the right scientific jorgan. Please help

Hi, can you show me how to prepare dry hydrogen using the usual apparatus.

i have come across this term many a times but was not able to find out as to what is it. the term is 'half-equation'. is it to do with ionic equation? so can any 1 tell me. thnx

A gas has a density of 2.857 g/l at STP. The pressure is dropped by 20.0 kpa in order to change its density to 2.000 g/l, what must be the new temperature to achieve this lower density. Any suggestions on how to start this problem is needed.

Hi everyone. I am doing a beginner chemistry course from abroad. I am in chile... and so I *think* I have found the right ingredients to complete my lab but my results are not what I expected. *the experiment is REALLY basic.....* Its a kitchen lab, where I was asked to put an steel (iron) nail a galvanized (zinc ) nail a penny and a nickel in vinegar. (and watch the reaction.) (There are no pennies in chile. and the only STEEL nail I could find was STAINLESS steel.) so. I saw the zinc reaction > releasing H2 gas. But the copper pipe, stainless steel nail and nickel (amazingly, I still had a canadian nickel in my purse ) didnt show any signs of re…

In the process called fluorescence, some substances absorb photons of one kind of radiation (e.g. ultraviolet radiation), and give out photons of a different kind (e.g. visible light). When infrared radiation falls on these materials, visible light is not emitted. Why not? (no further information about fluorescence to be included)

When conducting an experiment to test the relationship between the enthalpy changes of different alchols, I came across something which i couldn't explain. Taking propan-1-ol and propan-2-ol as an example, I found that propan-1-ol had a higher enthalpy change. Could someone explain to me why this is so. (the same thing happened for butan-1-ol and butan-2-ol) Although I have no precise knowledge to base my hypothesis on, I would have expected this relationship to be the other way round. Please help.

I'm trying to understand the nomenclature of oxyanions, but I don't understand how I can look at the periodic table and tell which oxyanion has an -ite or -ate suffix. How do I figure it out? Is there some kind of pattern? I don't see much information on the web about this. I have a hunch it has something to do with orbitals, but I'm not sure.

can someone give me two properties that could distinguish an ionic compound from a molecular compound

Would this be two significant figures or three significant figures? The middle marks before the 4 and above the 0 are to represent .5 marks. I got lazy and didn't add in the labels after 4. I'm trying to understand how people use instruments and determine significant figures. After reading my book, I figure it would probably say there are two significant figures: 2.5 But from the looks of it, I would say there are three significant figures: 2.55 I'm certain it's above the 2.5, but I'm not sure about anything between 2.5 and 3.0. Would it be better to say 2.50? I can't determine how people figure out the amount of significant figures when looking…

um, I am new to all this fancy sciency stuff, but I am very eager to learn. So anyway, I have been doing some research and there are some terms i just don't get so, This is going to be my official what the "heck does this word mean?" post so I will post new words regularly. what do(es) the following word(s) mean?: bond axis-???

hi, This is my question; identify the postive charged ion present in an aqueous solution of selenius acid. write a balanced equation for the breakdown of selenius acid in water and deduce the charge on the other ion that is formed. argh.ch