Chemistry Definition and 993 Threads

23.7 g of water is in a container of 23.7 L at 298.15 . The vapor pressure of water at this temperature is 23.76 Torr. A) What phases are present? B) At what volume would only the gas phase be present? C) At what volume would only the liquid phase be present? A) I know that only the...

Hello, We are taking atoms lesson in chemistry and we should have a project for this lesson any ideas for a project?

Homework Statement Two balls, one soaked in concentrated HCl and the other in NH4OH are placed at the left and right ends of a 1m long evacuated glass tube, respectively. HCl and ammonia vaporize and travel down the tube, reacting to form a white ring where they meet. Where does the ring form...

Homework Statement (see uploaded attachment for picture). I basically have to name this molecule. The Attempt at a Solution I don't know where to start counting for the longest carbon chain and I'm not sure if it's a nonane or octane. If you guys can help it'd be much appreciated

Hello all, This is a homework problem for my CHE345 class. Not sure what to do here, please at least let me know if I'm in the right ballpark. Homework Statement A student decomposes KCLO3 and collects 35.2 cm^3 of O2 over water at 23.0°C. The laboratory barometer reads 751 Torr. The...

Is it just so chemistry is extra confusing to students? I don't understand...

Homework Statement Each of the following salts can be prepared from an acid and a base. Write the balanced molecular equation and the net ionic equation for the preperation of each. indicate states of the reactants and producys . Review solubility rules if neccesary to determine the...

Is it a good idea to take P Chem without taking any chemistry at college level? My high school had a strong chemistry program (we did organic in high school) but I haven't done any Chemistry in college. I am currently taking Quantum Mech 2, and will be taking Thermal Physics and Condensed Matter...

Im taking a 2nd year Chemistry class at my university and I'm struggling. I'm very good a math and physics. How much knowledge of chemistry will you need in physics or a major in physics? I see a lot of sub atomic physics and particles and quantum physics etc.. Will I need to master chemistry?

Homework Statement How many ions are present in 1 formula unit of HI(aq)? HBr(g)? N2S5? Homework Equations These two questions have the same concept, I believe. I went the simple way and thought the answer was 2 for both of them, but apparently that was wrong. Can someone show me how to...

Homework Statement In a universe different from ours, the laws of quantum mechanics are the same as ours with one small change. In this different universe the m ℓ quantum number obeys this rule. mℓ = (-ℓ-1), (-ℓ),..,0,...(ℓ), (ℓ+1) In this different universe, what is the maximum number...

Uh, my program is Biotechnology/biochem (might change it). I can take a "Biophysical chemistry"or a "physical chemistry" mind you, I am strugging to even pas year one physics i hate it and it sucks. So I really want something with not as much math. Does anyone know if biophysicalchem has less...

1. Assume that one mole of H2O(g) condenses to H2O(l) at 1.00atm and 95 Celcius. Calculate q, w, ΔH, ΔS of the system, ΔS of surroundings. BUT I AM NOT ASKING HOW TO CALCULATE THESE VALUES, SEE LAST SENTENCE OF POST. Homework Equations q = nCΔT ΔH = n(Cp)ΔT W = -PΔV ΔS = [q_reversible] / T Cp...

Homework Statement Calculate the molar solubility of Ag2C2O4 (silver oxalate) in a solution that has a fixed H3O+ concentration of 1.0 x 10^-6 M. Homework Equations The Attempt at a Solution I found the pertinent reactions, the charge balance and the mass balance so far, but I...

Homework Statement Find the concentration of Pb2+ in 0.0010 M KI with PbI2. Include activity coefficients in your solubility-product expression. The Ksp of PbI2 is 9.8*10^-9 Homework Equations Ksp= [Pb2+]\gammaPb2+[I-]2\gamma2I- Assume that [I-]=0.0010 M. The ionic strength of 0.0010 M Ki...

the energies of light quanta increase gradually as the color of light changes. Of the following metals, which has the largest energy change: sodium, barium, calcium, strontium, lithium, potassium, and copper (ll) I need this within half an hour :cry: I'm guessing it has something...

I am having difficulties studying for organic chemistry. The concepts don't seem especially difficult, but I am not performing where I want to be at in this class (1st semester organic chemistry). I do fine in math and physics, and even did well in general chemistry, but it seems the skills...

Hi. I'm looking for a good 101 chemistry book (still big in size) for university. The kind of all around book with all the useful formulas, and explanation for how they are used. Another type of book I'm looking for is a good datebook for chemistry, with all the table values such as ΔH ΔS...

How long does it take you to write a prelab or lab report for chemistry lab? And what grades do you usually get for these assignments? I spend like at least 2 hours writing a lab report because I want to get a perfect grade. Also, I spend quite a lot of time on a prelab too, because I'm scared...

Hi, First of all, I don't have much difficulties learning stuff for exams in general. Though, organic chemistry seems to be the hardest subject I ever had. Not because I find it too difficult to understand, it's because of the quantity. I don't really know how to properly prepare for my exam...

Homework Statement The equilibrium concentration of oxygen in fresh water exposed to the atmosphere is given for two temperatures. At 15 degrees celcius equilib [O2]= 630μmol/L at 25 degrees celcius equiln [O2]= 517μmol/L The expression for the equilibrium constant, K, between the oxygen...

I was looking for something like Bloomfield's "How things work" but for chemistry rather than physics. Audience is high school kids in a first chemistry course.

Hi everyone, My major is Chemical Engineering and I'm very indecisive about choosing a minor. My options are math and chemistry. Should I minor in both or just one? I don't know which minor would help me the most when I go out looking for a job in the future? I'm planning to attend Grad...

Can anyone help me with a chemistry ? When 47.5 J of heat are added to 13.2 g of a liquid, its temperature raises by 1.72 degree Celsius. What is the heat capacity of the liquid?

I suppose this is the right place to post this. I have been studying organic chemistry from more than three-four months and i can't even remember the basic reactions. There seems to be so many reactions which i need to memorize. Whenever i sit to do questions on the reactions, i always need to...

A mole of air (80% Nitrogen, and 20% Oxygen by volume) at 298.15K is brought into contact with liquid water which has a vapor pressure of 3168 Pa at this temperature. a) what is the volume of the dry air if the pressure is 1 bar? b) what is the final volume of the air saturated with...

Homework Statement Please look at the attached pic. I don't know how to type all these symbols in. Homework Equations Im not sure how to start The Attempt at a Solution I tried using the cyclic rule but the problem just started getting messier.

Homework Statement The hydrogen electron de-excites from its 3rd excited state, which are the true and false statements for it. 1. It emits radiation giving lines in Lymann, Balmer, Paschen series 2. It emits radiation of only UV and Visible region and not Infrared region 3. It emits radiation...

Homework Statement The following data were obtained for trace elemental zinc in a particular sample of high purity (%Au> 99.99%). The results are given in mg Zn/ kg Au. 15.38, 15.17, 15.33, 14.88, 14.71, 15.42, 15.60, 15.22 Find the zinc content and the uncertainty at 95% confidence...

Homework Statement I've not written a lab report since prep school and I need some critiques (thorough). see attached Homework Equations The Attempt at a Solution

I was wondering as to just how deeply chemistry relies on calculus. I'm great at all my chemistry homework and studies, but calculus is a real struggle for me. Not that it's impossible, just with the resources I have it's incredibly difficult. I worry that in the future, as in when I get to grad...

I attend UC Davis, which doesn't offer Neuroscience as a major. What is the next best alternative if I want to go into cognitive neuroscience? I'm currently majoring in Biochemistry. Is that the best major for Cognitive Neuroscience? If not, what is? According to wikipedia:" Due to its...

I have two questions regarding the first stage of traditional soapmaking, which, according to a bunch of DIY websites, is to make "lye water" out of "hardwood ash". Firstly, the 'pedia article on "wood ash" says that "potassium hydroxide [aka potash lye] can be indirectly made from wood ash...

I am seeking the most challenging and rigorous gen. chem. textbook to learn from. I have it pretty well narrowed to Oxtoby vs. Atkins. Caltech appears to use Oxtoby. Furthermore, the description for the Oxtoby book touts itself as "the most modern, rigorous, and chemically and mathematically...

Homework Statement titration method is more accurate than collection of carbon dioxide over water method to solve stoichiometry equation. Homework Equations what are the 3 reasons? The Attempt at a Solution some carbon dioxide has leak into the air, carbon dioxide is partially...

Homework Statement But-2-ene reacts with bromine in the presence of concentrated aqueous sodium nitrate to give the following compound CH3-C(H)(ONO2)-C(H)(Br)-CH3 Which of the following statement is correct. a.the electrophile is NO2+ b.Only 2,3-dibromobutane is formed. c.Resultant...

So I am a Chemistry major, but am behind on my math (was a Biology major but switched because I decided I would rather minor in Biology so as to avoid the boring plant and evolution/ecology stuff, plus I love Chemistry lol) and so am only taking calculus II this coming semester. My adviser wants...

Homework Statement Solutions of cobalt(II) nitrate and sodium hydroxide are mixed. What are the solubility rules for the hydroxides? and it occurs in a aqueous solution Homework Equations I have no idea how to solve these problems from my chem class lasty year and we will be...

After summer I have to do my physics A2 experiment coursework. I really like working with electricity and looking at what happens at an atomic level, but I fear that what I want too do is more chemistry than physics. I had the idea of look at electrical conductance through a salt solution...

Homework Statement Using the density of ethanol at 24 degrees Celsius how would I find the %/volume? I can find lots of places that have 20 or 25 degrees but I don't know where to find something referring to 24 degrees? Homework Equations The Attempt at a Solution I have to...

I'm solely talking about recent grads in these two fields. The job market for chemists is pretty dismal; I'd imagine it's more true for physicists, is it not? But it seems to me the skills learned under these two degrees are quite similar...I mean any physics BS can work as a labrat and any...

How much overlap is there between physical chemistry and chemical engineering with regards to thermodynamics, kinetics, and transport phenomena? Would it be beneficial for a chemical engineering student to take the physical chemistry courses that deal with these topics? Or would it be redundant...

Hi everyone, I am currently having a dilemma in regards to the next step of my education. I am into my second year of my MSc in inorganic chemistry and would like some advice in regards to different paths I could go after finishing. I've seen a lot of great advice given on this forum so I...

While reading organic chemistry, the textbook said that resonance is something which is found everywhere in chemistry. It applies everywhere in chemistry and so on. However so far the only application I've found of resonance is that the more resonance structures a certain molecule has, the more...

Is there any textbook or any book (introductory, mostly) out there that combines the teaching of physics, biology, and chemistry phenomenon while appropriately teaching the details for each of the fields as it goes on. Or anything similar?

Hey guys, I've just got an assessment coming up. I just want to double check if I got it right and perhaps people can help me with a question or two. QUESTION 1. Consider the reaction A(s) + 3B(g) = 4C(g), ΔH°=-16.6kJ i) Given Kc = 0.00570, calculate Kp at 198°C. ii) Given p(B) = 0.10atm...

Hello everyone, just joined the forum. I need some solid advice about choosing my career path, I've read some of the previous posts on the topic, but would greatly appreciate any further help! I'm 18 years old, at the end of high school. I love and enjoy both Physics and Chemistry, and work...

Hello, I am planning to major in chemistry and I just wanted to know if a lot of the material is, or requires, mathematics. I love math and I would say I am pretty good at it. It would be my second choice for a major. However, I heard that chemistry is not really a mathematical science, more...

Homework Statement Write the ground state electron configuration of Mn2+. Homework Equations N/A The Attempt at a Solution Well I thought that since it had the 2+ superscript and manganese is a metal, it must have lost two electrons. Manganese has an atomic number of 25 and...

how oxidation or reduction potential a measure of oxidizing or reducing power,it just observed that higher r.p or o.p higher oxidizing power or reducing power,or it has well sounded explanation