What is Chem: Definition and 424 Discussions

Periodicity & Chemical Bonding "Homework Help" General Chem 30. How does ionization energy change as one proceeds a) across the periodic table in a horizontal row b) down the periodic table in a vertical group Give an explantion for each answer. 31. Arrange the following atoms or ions...

As you can tell, not my favorite subject. :grumpy: I was going along fine just tinkering with these things and working them out until I started trying to balance this one: Ca3(PO4) + H2SO4 -> CaSO4 + H3PO4 The coefficients I have tried so far are: 2Ca3(PO4) + 3H2SO4 -> 6CaSO4 + 2H3PO4...

Tomorrow was the day I was going to get a jump start on everybody by drinking all throughout the day instead of just at the end (keep class interesting :wink: ). Tonight I mixed some tequila and lemon juice about half and half inside of a 950mL Gatoride bottle so I could just grab it when...

i have this chem teacher who does NOT teach from the book at all! he just expects us to read the book and understand it completely. so yeah i have a few questions that i can't do! how long would it take a plane, traveling at an average speed of 634km/h, to cover a distance of 3912 km...

A gas stream contains 18.0 mole % hexane and the remainder nitrogen. The stream flows to a condenser, where its temperature is reduced and some of the hexane is liquefied. The hexane mole fraction in the gas stream leaving the condenser is .0500. Liquid hexane condensate is recovered at a...

dear friends.. i am a high skool student.we have to do an investigatory project on bio and chem.. chem - food adulteration bio - cancer chem we have completed te practicals but similar to phy we have to submit 10 - 12 pages of relevant info. in case of bio we have todo on cancer.. but...

Hi, I am sorry if I have posted this thread in the wrong place, but I am looking for good books on Inorganic Chemistry.. I need to build up a good base of this branch of Chemistry coz I am quite weak at it..My organic chemistry is strong though... Actually, I want a book on this topic...

Well i am having problem prepearing this alcohol from bromobenzene and 1-butene please help.This question is from Solomons organic chem.

Just curious (and nervous bc the test is tomorrow) but is the equation sheet given on the multiple choice section or only on the free response part? Thanks for your help!

Gaseous oxides of nitrogen rarely occur as pure substances, but as equilibrium mixtures of them. One of these equilibrium mixtures is nitrogen dioxide and dinitrogen tetroxide. If the density of such a mixture is 2.3 g/l at 74 degrees Celsius and 1.3 atm, calculate the partial pressures of the...

Hello... i am concurantly working on a chemistry project called my "favorite" element... i wanted to do helium because of its akward behavior at near absolute zero but since it doesn't react w/ anything i couldn't use it for my stoichiometry problems:frown: ... well anyways my element that i...

[SOLVED] an AP chem free response (please help!) i have a final tomorrow (yea i was procrasinating) and i have to figure out how to do these practice problems! please help you can! i need to know how to do it ASAP! NH3(aq) + H20(l) <---> NH4+(aq) + OH-(aq) In aqueous solution, ammonia...

Math Rules Chem:) NO_3 What is the molecular formula of this compound if molar mass is 324.06. Math begins: aN + bO = 324.06 N=14, O = 16 14a + 16b = 324.06 N = O/3, O = 3N, a = b/3, b = 3a a = 162.03/32 =~ 5, b =~ 15. N_{5}O_{15}

Hi, I am having a huge problem with chem. i do not know what the heck is going on so can i have some help. Drops of each chemical into test tubes ================================================== =================== ratios Ca:CO test tube1: 0:24 test tube2: 1:5 test tube3: 1:2...

Hi, I am having a huge problem with chem. i do not know what the heck is going on so can i have some help. Drops of each chemical into test tubes ===================================================================== ratios Ca:CO test tube1: 0:24 test tube2: 1:5 test tube3: 1:2...

If a standard 100W light bulb needs 120V to shine, determine how long I could run the light bulb if I used up all the electrons in a copper penny to power it. Assume the penny to have a mass of 5.0g. Hint: think back to the units that make up watts and volts

[SOLVED] A chem problem...help please I don't know how to answer this question. I have to find the number of moles of water in the hydrate BaCL2*H2O. SOwwie i don't now how to make the 2 smaller. The mass of the hydrate is 5g, the Mass of lost water is .7 grams and the anhydrous compound is...

Consider this eq, It is balanced: KCN+HCl=KCl+HCN If a sample of 0.140g of KCN is treated with an excess of HCl, calculate the amount of HCN formed, in grams: I just want to know if I did this right 0.140g KCN/65g KCN = x/27g HCN and I got .058 g Another probem: Ammonium Nitrate...

Some one please check my lab report for me if it sound right (this is the first two section of my lab report). It had to be in third person pt of view, and written in passive voice. Plz give me any suggestions, or background of Cu and I, or wording of the intro. and procedure. They CANNOT be...

Please help me w/ the 2 redox equations. Show me how to assign the oxidation # and how to do it please, especially the 1st problem. The problems are attached. Thank you very much for ur time.

Please help me w/ the 2 redox equations. Show me how to assign the oxidation # and how to do it please, especially the 1st problem. The problems are attached. Thank you very much for ur time.

Someone please give me a good explanation on how to "Balance Oxidation- Reduction Equations." Plz show me the steps and an example of how to do this type of equations. Thanks a lot.

Someone please give me a good explanation on how to "Balance Oxidation- Reduction Equations." Plz show me the steps and an example of how to do this type of equations. Thanks a lot.

In mass spectrometer, the resolution required was defined as M/(delta M), So, it means for two larger M.W. molecules, the resolution required was larger than small M.W. molecules even the delta M was was the same... But why ??! why the instrument should have better resolution to...