Chem Definition and 424 Threads

I've worked it out and due to offering limitations it will take me 3 more years to do the former, and 2 more years to do the latter. I've already been in university for 2 years. The courses I'd need in order to accomplish both are listed below: For the dual major in physics/math with...

ok, here's a tricky brainteaser, whoever solves it is incredibly smart uhh, actually, it's homework, and it seems pretty basic. Well, here it goes "explain how liquid water can go from 25C/1 atm to 30C/1 atm in a process for which q<0" I was thinking perhaps that since q=mc_p \Delta...

What an awesome site. Well I was wondering, i have a bunch of thermodynamics physical chem related questions to ask, where is the best place to ask them? are any of you good at thermodynamics, are there any experts here? :approve:

technically, I only need one or the other to pick up my chem minor, but I might take both. How valuable would they be to a physics major planning to go to graduate school? I would like to take them both, but would grad schools care all that much? I am honestly not sure where I want to do...

In the expression: ksp = (3.42 x 10^-7) (6.84 x 10^-7)^2 = 1.6 x 10^-19 I don't understand how the final answer is found. Can someone show me a step by step? I'm attempting to understand how to do these types of questions! Any help is greatly appreciated!

Hello all, what is the major difference in these majors? What kind of job would I get with the chem E degree, what kind of job would I get with the chem degree? I am currently leaning more toward the chemical engineering degree, but am not entirely sure.

Hi guys can you please check if this is right...thanks in advance The heat released by the reaction 2C + 2H2 = CH4 is 74.8kJ/mol. Using this information and a table of standard enthalpy of formation values, determine the heat of combustion for the burning of methane to form CO2 and H2O(g)...

Hi guys can you please check if this is right...thanks in advance Given the reaction CO2(g) + H2(g) = H2O(g) + CO(g). If initially there are 2.0 moles of CO2 (g) and 2.0 moles of H2(g) introduced into an empty 1.0L container, at 1800ºC, it is found that at equilibrium there are 0.3 moles of...

chem question...curious?! hi guys i was just wondering that if a solution of a weak acid has a salt of the same acid added to it, what would happen to the pH?? can anyone help me out...thanks in advance

Why do geometric isomers only exist in the alkene family but not in alkanes? What are different ways of increasing the rate of a chemical reaction?

ok my final exam for chem is tomorrow and i need help badly on this practice problem! here it is: 3. When 9.250 kJ of heat is added to 20.0 g of ice at 0.0 degrees Celcius, what is the final temperature of the water? The heat of fusion for water is 335 J/g. I don't know how on Earth to...

Hey guys i need some help. Most of these questions i already know the answer to but i just want to make sure I'm right. My final grade is riding on this 1) If given a chemical equilibrium reaction with the delta H, by comparing the rate of the final reaction, is it possible to find the...

Hello,there are some question about physical chemistry to be asked. :-p 1) The space vehicle,Gemini,started its journey in space with 322kg of liquid fuel, CH3NHNH2. This fuel is oxidised by dinitrogen tetroxide,N2O4,to form nitrogen,carbon dioxide and water.hat is the mass of...

Besides texts by Charles H Corwin and Stephen Zumdahl, what texts are recommended for Introduction or Fundamentals of Chemistry. My texts are at least a couple of decades old. :biggrin:

Hey, I have a question which asks me to provide two examples of how organic chem can be used to improve existing products and therefore provide solutions to newly identified health or environment problems. One example is unleaded gasoline, instead of leaded. What are some others? I've...

What is an "organic functional group" ? What relation does it have towards pH ?

CHEM EQUAtioNS HARD! hi can anybody show me if i am writing these equations right or not thanks Fe3+ + 6H20 -> F2(H20)6 3 + Fe(H20)6 3+ + h20 -> Fe(h20)5(OH) 2+ + H30+ when added HCL Fe(H20)5(OH) 2+ + 4Cl- -> Fe(OH)cl4 2- + 5H20 when added KSCN Fe(OH)cl4 2- + SCN- ->...

It has to do with sig fig. Froom what i know, when performing log in an equation, only the numbers are the decimal point are counted as sig figs. So if i have 0.1 M of acid, to find the ph, it would be : -log(0.1) = 1; since sig figs have to be AFTER the decimal point, is the correct answer 1.0...

A(g) <--- <--- 2B(g) + C(g) When 1.00mol of A is placed in a 4.00L container at temperature t, the concentration of C at equilibrium is 0.050mol/L. What is the equilibrium constant for the reaction at temperature t? Thanks for the help.

For this one, Could someone check my work? 1.What volume of a 15.0mol/L standard solution of hydrochloric acid will be required a make a 450mL of a 2.25mol/L dilution? \frac{15mol/L}{2.25mol/L}=6.67 *I think there is no unit for 6.67 =(6.67)(0.450L)=3L 2.Will it be possible for...

Calucation of ERRORS - CHEM! hi I am doing one of those determining calcium hardness in swimming pool water here just stuck on a few bits 1) how do i convert concentration (mol/L) -> ppm ( parts per milliion) example i am given concentration of calcium = 8.595*10^-4 M how do i get parts...

the question is: What is the pH of 1.50M of NH3? the answer i got was a pH of 4.54.. is that correct?

The ionization of water is an endothermic process. a.)What happens to the value of Kw as water is heated? explain.. b.) What happens to the pH of pure water as the temperature increases? and c.)as the temperature of pure water rises, will the water become mor acidic, more basic or remain...

Lets say you want to find the molar volume of a gas ( H_{2} specifically). So you basically use a Mg ribbon and find the volume of the H_{2} gas in a test tube with the Mg ribbon. The water fizzes and bubbles. I am having trouble finding the volume of H_{2} at STP. I used the formula...

The density of a substance is 1.37 g/cm3. Convert this into kg/m3. Remember that: 1kg = 103 g and 1 m = 102 cm. Express your answer to 1 decimal place (don't include units). what i did is 1.37g = 0.00137 kg 1cm^3 = 1*10^-6 ie (1/(10^3)) 0.00137 / (1*10^-6) = 1370.0 kg/m^3 is that...

When determining molecular shape, how do you know what the lewis structure shape will be? For example CO_{2} is linear and polar (sp hybridization). But about CS_{2} ? Is this also molecularly linear? Thanks :smile:

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...