Chemistry Definition and 993 Threads

Author: Donald McQuarrie Title: Quantum Chemistry Amazon Link: https://www.amazon.com/dp/1891389505/?tag=pfamazon01-20

Author: Jonathan Clayden, Nick Greeves, Stuart Warren Title: Organic Chemistry Amazon Link: https://www.amazon.com/dp/0199270295/?tag=pfamazon01-20 Level: Undergrad

I'm hoping for verification here that I'm not crazy on some very very basic chemistry questions. I've worked 7 problems on a practice test (the real thing is next Tuesday). Only 2 of my answers agree with the answer key. Here are the most dramatic examples. Please tell me I'm not crazy...

Complcated Chemistry Reaction - impossible?? Help :( My notes say: Step 1 is a 221 reaction. If peroxides are used in your version, then the anti-Markovnikov bromide is formed. If your version had only HBr, the the Markovnikov bromide is formeed. Step 2 creates organolithium or Grignard...

Our class doesn't use a textbook and our professor doesn't give out much notes. Just handouts with problems on it. So I wanted a textbook to accompany my studies but don't know which is the best/rigorious general chemistry textbook.

Author: J. D. Lee Title: Concise Inorganic Chemistry Amazon Link: https://www.amazon.com/dp/0632052937/?tag=pfamazon01-20 Prerequisities: Contents:

Homework Statement I have a chemistry teacher who discourages students from asking questions (long story, but he's just not a good teacher). We have an online textbook, which fails to explain a lot when it comes to formulas. One thing I want to understand is what the different letters and...

Homework Statement Chloroethane, reacts with Oxygen according to the equation below: 2C2H3Cl + 5O2 → 4CO2 + 2H2O +2HCl How many moles of CO2 are produced when 3.0 moles of choloroethane and 3 mol of O2 are...

Author: Theodore L. Brown Title: Chemistry: The Central Science Amazon Link: https://www.amazon.com/dp/0130484504/?tag=pfamazon01-20 Prerequisities: Contents:

Author: Peter Atkins Title: Physical Chemistry Amazon Link: https://www.amazon.com/dp/0716735393/?tag=pfamazon01-20 Prerequisities: Contents:

"Guess the Mechanism" help! (Organic Chemistry) Homework Statement After identifying my reactants and products via spectral analysis, I am now tasked with figuring out the mechanism behind converting a diol into a ketone. Homework Equations The Attempt at a Solution The key to this appears...

Author: Robert T. Morrison, Robert N. Boyd Title: Organic Chemistry Amazon Link: https://www.amazon.com/dp/0136436692/?tag=pfamazon01-20 Prerequisities: No prerequisites Contents: User comments: https://www.physicsforums.com/member.php?u=331656: I can't really say much about...

Author: Jerry March, Michael B. Smith Title: March's Advanced Organic Chemistry: Reactions, Mechanisms, and Structure Amazon Link: https://www.amazon.com/dp/0471720917/?tag=pfamazon01-20 Prerequisities: High-School Chemistry Contents: User comments...

Hi, I have an exam tomorrow for atmospheric chemistry and I was just going over some past papers. In one it asks the following question, "What is meant by "Mean Free Path"? How is this relevant to atmospheric chemistry. My answer was as follows "The mean free path is the average distance a...

1. A vessel that contains a gas has two pressure gauges attached to it. One contains liquid mercury, and the other an oi lsuch as dibutyl phthalate. The difference in levels of mercury in the two arms of the mercury gauge is observed to be 9.50 cm.Given density of mercury =13.60 g cm-3...

Why does no temperature change occur while ice is melting? Specifially, when very little ice is left, how does so much water remain at 0 degrees Celcius? Is the energy transfer (of heat) to ice constant? Specifically, does the time range in an exponential manner for different sizes of ice to...

Homework Statement Okay i want to ask 2 questions. Question 1 Hyperstoichiometric compound Al3O has a vibrational energy spacing of 3.08x 10^-21J how many molecules are present in the ground state at 300k and 3000K Question 2 Calirimetric data for protein unfolding yielded following...

Hello, Since I can remember I have always dreamt of having an academic career and research. Theoretically physics seems very interesting to me and has always been my plan of what to pursue. The idea of knowing more about the world and discovering how it works is very enchanting to me. This...

I'm curious what your thoughts are on this program: https://uwaterloo.ca/science/current-undergraduate-students/majors-minors-specializations/medicinal-chemistry-co-op-only It's a new program at Waterloo. It sounds to me to be similar to pharmacology, but I was under the impression that...

I believe that the current chemistry curriculum has had a major increase in biological content in the past 10 years, and that this biological content has replaced valuable mathematical content. It used to be that the core classes of chemistry were, along with the basic math core of calculus...

My wife insists that pasta is not to be cooked with the lid on the pot. I reason that the cooking temperature must be fairly constant at the boiling point of water, so the energy required to cook the pasta can be reduced by putting a lid on the pot and turning the burner down just enough that...

I require some guidance on my career. My school offers a very vague stream sellection in the senior secondary section(Grade 11). I do wish to specialise in Physics or Chemistry as these subjects interest me quite a lot. To do so I must opt for the 'Science with Computer Science Group) at school...

Hi everyone! A couple of questions for you. So, I'm thinking about pursuing a career in chemistry research BUT I also really like physics, so I'm not really sure which to choose... -If I were to get a physics undergrad degree, could I move into chemistry? -If I were to get a chemistry Ph.D...

Homework Statement 50.0 mL sample of 2.0 10–4 M CuNO3 is added to 50.0 mL of 4.0 M NaCN. The formation constant of the complex ion Cu(CN)3 is 1.0 10^9. What is the copper(I) ion concentration in this system at equilibrium? The Attempt at a Solution I did a dilution and got the new...

Homework Statement Basically I'm doing a lab report where we place copper pennies in a solution of salt and vinegar. This should strip the copper oxide off the outside of the pennies, leaving the copper underneath shiny and looking "new". The problem is why we add the salt. Homework...

In a dish with the volume 1 litre we have 0.3 moles of nitrogen, 0.4 moles of hydrogen and 0.1 moles of amoniac. How many moles of hydrogen should we add to the dish so we can double the concentration of the balance for amoniac,if the temperature does not change? So I find the concentrations by...

Kp for the reaction H2+I2--> 2HI is 50.2 is 718 K. The ▲H (enthalpy) on standard conditions is 25 kJ mol^-1 .Use this information to find the enthropy of the reaction on 718 K...so I can findf free Gibbs energy from Kp,(in standard conditions) and therefore the standard enthropy..but how about...

1. A buffer is prepared by mixing a 100.0ml of a 0.100M NH3 solution with a 0.200M solution of NH4Cl and making the total volume up to 1.000L of water. What is the volume of the NH4Cl solution required to achieve a buffer at pH=9.5 Ka of NH4+ = 5.6x10^-10 The textbook tell me that the...

Hey guys, I hope this is the right spot to this. I don't want to get another infraction. I just got recently got out of my first physical chemistry class and am now thinking towards the second one. I'm wondering which book would be the best supplement to read over the break and help me get...

The reaction A+B ->Products is of second order related to A ,and of first order related to B.The reaction occurs on 298 K.When A=0.75 mol L^-1 and B=0,8 mol l^-1 the speed of the consumption of A and B is 0.00347 mol l^-1 min ^-1.What will be the speed of consumption of A and B after these...

Hello, how did chemists of the past know the weight of the elements to build up the periodic table without using new lab tecniques ? Have they transformed all the elements into gases and used Avogadro's law to obtain a relative atomic mass ? And how did they it was an element and not a...

Homework Statement Complete combustion of a 0.0150 mol sample of a hydrocarbon, CxHy, gives 1.680L of CO2 at STP and 0.810g of H2O a) what is the molecular formula b) what is empirical formula Homework Equations pv=nRt The Attempt at a Solution a) mol of co2: n=pv/Rt=1 atm *...

Reacton between the substances is A+B--> 2C where Pa=3 atm,Pb=2 atm.The reaction moves to the right until 70 percent of B has reacted and we have the equilibrum.FFind Pa,Pb,Pc and the constant of equilibrum Pa Pb Pc So in the beginning...

In 3000 K the constant of disintegration in the equilibrum of the reaction Cl2-> ( <-) 2Cl is 0.570 atm.In the equilibrum the reaction weighs 3 miligrams and is contained in a dish with volume 60 mL and the temperature is 3000 K.Find the total pressure. So I used p=n/V*R*T where n=m/M when M...

Hydrogen atoms are generated in an excited state where the electron occupies the 2p orbital. The excited sample of atoms then emits radiation that is directed to an unknown metal. The radiation ejects electrons with kinetic energy 8.77 x 10^-19 J. Given the data in the table below, identify the...

I am having a difficult time with this subject. There are so many things to rote memorize here and that's way too difficult for me to rote learn the things. There are loads of reactions, so many reactions for each group, different types of periodic trends, how one can learn or rather, rote...

Homework Statement How many grams of steam at 100 deg. Celcius would be required to raise the temperature of 35.8 g solid benzene from 5.5 deg Celcius to 45.0 deg Celcius? Assume that heat is only transferred from the steam (not the liquid water) and that the steam/water and benzene are...

Hello, I'm a mechanical engineering student working on my senior design project. It involves the automated correction of an electrolyte's chemistry. That being the pH, conductance, and zinc concentration. One of the tasks is to apply a "transient control analysis". This involves creating...

Hi all, My instructor in my college chemistry class continually refers to cell potentials (as in battery cell potentials) in units of electron-volts. Is there any case in physics or chemistry where this is correct? My understanding is that an electron-volt is generally a unit of energy, but...

Homework Statement 609.5 grams of vanadium (II) oxide, VO, and 832 grams of iron(III) oxide, Fe2O3, react according to the equation, which substance(s) and how many grams of each would be in the tube after the reaction completes? 3 points Homework Equations Equation: 2 VO + 3 Fe2O3 -> 6 FeO...

I read on a website that by washing a precipitate with too much de-ionised water; the precipitate is Peptized and thus some precipitate is lost. I am having a hard time understanding what peptization is? Can somebody please help me understand in simple terms for an A level student?

Hello all! I have been searching for a good inorganic chemistry book. I came across the book Inorganic Chemistry by Khadakov. This book is by MIR Publishers which is the reason i have made this thread. Unfortunately, since this isn't a popular book, i found no reviews and preview for this book...

Homework Statement Consider the heating curve for H2O. a. As heat is added to melt ice, does the the temperature change? Explain what happens to the heat that is added. b. For the same amount of H2O, does it take more to melt ice or vaporize water? Explain why. c. Is the fusion of ice...

A student titrated a .4630g of unknown monoprotic acid with .1060M NaOH. The equivalance point volume is 28.70mL. a) Calculate the number of moles of NaOH used. Im pretty sure I got this one I did .1060 M X .02870L to equal 3.04E-3 mol b)how many equivalents of unknown acid were titrated...

Hi, what's a good program/software for writing chemical equations, redox reactions etc. I find Office Word to be a bit slow for that (or perhaps it's my who is slow at using it :P ), And I'm having a difficult time compiling oxidation numbers on top of the elements. Any chemistry friendly...

Homework Statement Which has the strongest ionic bond? Cs2Se AlN CaI2 Kbr Homework Equations Look at electronegativities The Attempt at a Solution I looked at electronegativities and found the differences. The largest difference was KBr. But apparently, that was wrong. See EN differences...

hi, I have been selected for panel discussion in my university on the event of a Chemistry workshop.i was informed of the subject today and it stated "WOW in chemistry". it has gone over my head and i cannot figure out wat it means . i still wonder if it means the surprising discoveries and...

Hi, I'm no expert and I'm still in high school, but I'm curious about the relationship between physics and chemistry. As far as I know Chemistry is based on atomistic theory, right? Well, I'm wondering does physics support atomistic theory entirely or there are some parts of this theory that are...

Homework Statement The reaction between zinc and hydrochloric acid is carried out as a source of hydrogen gas in the laboratory: Zn(s)+2 HCl(aq)\rightarrow ZnCl_2(aq)+H_2(g) If 325 mL of hydrogen gas is collected over water at 25°C at a total pressure of 748 mm Hg, how many grams of Zn...

1. Homework Statement Okay, I just started working on my unknown in Lab and I got stuck with a liquid. First I determined the boiling point, my professor told me to let this step go for 30 minutes and it plateaued at around 147°C. I did this twice the first time I didn't do it as long and got...