Chem Definition and 398 Threads

This is the equation I am supposed to write and balance: The formation of solid iron (III) chloride from its elements. I tried to write it like this- 3Fe + 2Cl = 2FeCl3 But my teacher then asked: How does chlorine exist as an element?What I mean is if I have a container full of chlorine at...

Can someone tell me how to write this equation? Germanium dioxide (GeO2) is heated with carbon to obtain germanium and carbon monoxide.

Hi everyone :smile: I need help to answer these question related to physical chemistry : 1- In reaction Kinetics, what reaction takes place during titration? 2- In reaction kinetics, why do we use a water bath? 3- Why Dicarboxylic acids do not show a clear odd-even effect in pKa...

What is the equation for the heat of formation for propanol?

1. What is the use of deflagrating spoon? 2. What is the difference between copper (II) sulphide and copper (III) sulphide? (I don't understand what the II, III or IV mean) 3. What is the term for the converse of sublimation? thanks

does this make any sense at all ? :cry: I am so stressed out by this, pls someone verify it, its GCSE level... ANALYSIS Apart from propanol, the graph shows the increase of energy output is proportional to the increase of RMM for alcohol. According to the line of best fit, butanol produced...

If we have a HCl molecule, then we know that the electronegativity of hydrogen is greater than that of chlorine. So in an electric field, the chlorine will be partially negative and the hydrogen will be partially positive: H: \delta + Cl: \delta - . Then why would this have a dipole moment...

How do you know whether a group of ions is isoelectronic? Also what does this notation mean: Ca: [Ar]4s^{2} ? Thanks

GA Tech Berkeley UCSD UT Austin UCLA Rose-Hulman. So far I've been admitted to Rose-Hulman and GA Tech. I am still waiting to hear from the rest. I am seriously considering GA Tech at this point. Area is important and that is why I'm ruling out Rose-Hulman at this point. Berkeley is...

What exactly are the trends in the periodic table? Is this right: (a) go more right (ionization energy increases) (b) go more down atomic radius increases What are the trends for second ionization energy, ionic radius, ionization energy? If you are given a electron configuration how do...

1) Calculate the pH at the equivalence point in titrating 0.10 M solution of HBR with 0.08 M NaOH I know how to do the problem if volume amounts are included. I don't know how many liters are used and consequently the number of moles. Should I just invent some volume for one and calculate the...

:::::: CHEM QUESTION - answer fast please thanks a lot :::::::: Hi, this maybe a very stupid question but I have a test coming up tomorrow and I'm not sure of this thing here: Suppose you were given 1 M hydrochloric acid (I assume 1 M to mean a concentration of 1 mol/ L ) Calculate its...

Can someone please explain in detail what the difference is between a chemist and a chemical engineer? I have no idea what I want to do with my future so I am considering all options. I was thinking about applying to grad schools for Chem E, just to see what kind of offers I might get. I was...

Well, did you? If so, why?

hey, im thinking of going into chemical engineering next year at university, and was wondering about the career opportunities available. Is it easy to get a job with a degree in this field? thanks

When I took physics in high school, it was prett fun partly because of the fact that there were better theories and that mainly what we were learnign was ultimately wrong. I'm in honors chemistry now, and the class isn't giving me any trouble, however I would absolutely love it if I could...

I'm really stuck on this question: What will be the final temperature if 50.0 g of steam at 100 degrees celsius is mixed with 600 mL of water at 10.0 degrees celsius? (Answer: 58.3 degrees celsius) So far I've got: heat lost (steam) = heat gained (water) nH + mc(delta)t = mc(delta)t...

How could i (mathematically) show what the concentration of IO3- in the following solution? 15mL of 0.20mol/L IO3- solution 5mL of water

Hi, I have done simple polymerization but none like this. Can you please help me on this question. What would be the structure of the polymer produced by the polymerization of (see attached picture) Draw 3 repeating units. Thanks so much

I am looking to get into Chem Engineering or Materials Science. I will be transferring as a Junior from Community College. I would like to know what schools have good programs with good hands-on training opportunities as well offering a good understanding of theory. I live in Florida currently...

EDTA titration--(Analytical Chem.) A mixture of Mn2+, Mg2+, and Zn2+ was analyzed as follows: The 25.00mL sample was treated with 0.25g of NH3OHCl (hydroxylammonium chloride)--a reducing agent that maintains manganese in the 2+ state. 10 mL of ammonia buffer (pH10) and a few drops of...

Help, I need to know how to do these problems! 1. How many grams of Mg(OH)2 (subscript 2, just in case) will be needed to neutralize 25 mL of stomach acid if stomach acid is 0.10 M HCl? 2 How many mL of a 0.10 NaOH solution are needed to neutralize 15 mL of 0.20 M H3PO4 (subscripts)...

With an aqueous solution containing Cu(I) ions complexed by ammonia, isomer P gave a red precipitate. On vigorous oxidation by aqueous manganate (VII) ions, isomer Q gave only ethanoic acid whereas isomer R gave an unbranched chain, dicarboxylic acid. Write structual formulae for isomers P, Q...

well i have a really simple question about organic chemistry if someone could help me it wil be nice. Q. why is 2-bromocyclohexanal more easily hydrated as compared to cylohexanal. Q. Why are 3 Degree alcohols more basic the 1 degree alcohol. Q. Why we add finely divided platinium in...

Periodicity & Chemical Bonding "Homework Help" General Chem [FONT=Times New Roman]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...

As you can tell, not my favorite subject. 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 so...

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...