Chemistry Definition and 993 Threads

I want to use small molecular - preferably CNT - "antennas" to produce THz signals to monitor activity in biological systems. After some googling, I've been reading things like "absorption spectra", "energy bands", "spectroscopy", as well as a bunch of antenna-science related jargon... I need...

Hi all, I have a question about this exercise: Which is the best option of pH for electrophoresis separation of two peptides with isoelectric points of 10.3 and 7 respectively? The given options of pH are 3,8 or 10. I've thought that if pH is more than 7, then, there will be positive charge...

To sum up the current biggest stress of my life into a question: do you recommend that I stay in a biology/chemistry-based research program or pursue proof-based math courses? I am a freshman physics major at a good research university. I was invited into a very difficult program for "future...

Homework Statement You may have noticed that water sometimes drips from the exhaust of a car as it is running. Is this evidence that there is at least a small amount of water originally present in the gasoline? Homework Equations not sure if there is one. The Attempt at a Solution I'm not...

How electron revolves around orbitals? Is the velocity uniform or accelerated?

I am an eleventh class student from India. Good in chemistry.

Homework Statement The spectrum shows the series 3p - nd, n = 4 - 7 in Na as well as the resonance line 3s - 3p, with the experimental vacuum wavelengths in Å.Calculate the quantum defect for the nd ##^2D## n = 4-7 terms. Estimate, as accurately as possible, the wavelength for 3p - 8d. The...

Chemistry World (a magazine published by the UK Royal Society of Chemistry) is reporting that YouTube seems to indiscriminately be taking chemistry videos off of the site and banning the creators of those videos...

Basically, the F block is a series in the periodic table that consist of elements that are artificially synthesized. My question is, why were these elements synthesized? What was the need of synthesizing such elements?

Homework Statement The ratio of KMnO4 to I2 is given by 2 MnO4 - + 16 H+ + 10 I - ⇌ 2 Mn2+ + 5 I2 + 8 H2O the ratio is 2:5 - The ratio of I2 to S2O3 2- is given by 1 I2 + 2 S2O32- ⇌ 2 I-+ S4O5 2- the ratio is 1:2 therefore n(S2O3 2- ) = n(MnO4 - ) x 5 Homework Equations Why the mole of...

I need to make the design of car floatation devices. In my case, the airbag/raft is for floating the car in case of floods. I am considering to use Sodium Azide, just like in car airbags, but it inflates very fast and shrinks in a short time. Is there any other chemical reaction that can produce...

Homework Statement Calculate E cell for the following reaction at 25deg celcius 3 CU(s) + 2 MnO4-(aq) + 8 H+(aq) →2 MnO2(s) + 3 CU^2+(aq) + 4 H2O(l) Given: [CU^2+] = 0.010M, [MnO4-] = 2.0M, [H+] = 1.0M I’ve posted a picture of my work, if someone could just let me know if I answered the...

Homework Statement 2 IO3−(aq) + 6 H+(aq) + 10 I−(aq) →6 I2(s) + 6 H2O(l) I didn’t want to re-type all of this up but I uploaded of picture of my work for this problem. I was just wondering if I completed it correctly and if not if someone could guide me in the right direction. Thank you!

I was wondering if I should retake this course for a better grade. I got numerous responses from the colleges I am interested in for grad school. Probably will be taking Advanced Organic Chemistry as an advanced elective. If they have other courses that are offered like instrumental analysis I...

Hello, Looking for some guidance for my son. He will be a senior in high school in the fall and will be applying to university programs in Ontario, Canada. He is leaning towards studying chemistry and/or physics. We (his parents) absolutely want him to follow his passions, but of course are...

I am enrolled at the University of Waterloo's Honours Physics Program with a specialization in Applied Physics. In the future I would like to either work as a physicist conducting research or work on developing energy sources like nuclear or solar power. My main options would include a minor in...

As a chemistry major I have to take one advance elective. Unfortunately it’s very difficult to tell which courses will be offered in that semester. I’m hoping inorganic chemistry 2 is offered. Because the last couple of semesters it seems advance organic chemistry was offered. The problem with...

Homework Statement What is the common ion effect? I've been searching online for quite a while but none of the answers already out there seems to clear things up for me... Homework Equations N/A The Attempt at a Solution N/A

Homework Statement >For a solution that contains 0.10 M HCN and 0.10 M NaCN, which statement is false? A) This is an example of the common ion effect. B) The [H+] is larger than it would be if only the HCN was in solution. C) the [H+] is equal to $K_a$ D) Addition of more NaCN will shift...

Hi there, TL/DR - I have a community college job with a sufficient salary. Should I be happy with that + freetime or should I try to get a job which really uses my PhD? If I go with happy freetime option, are any of the projects I propose interesting AND feasible? If I am too lazy to follow...

I have found some odd Nucleation points that appear inside of the top area of a bottle of Diet Pepsi (the area right near the cap as shown in pictures below). The nucleation sites appear either as soon as you open the bottle, or after the first drink (I will test this once more and see exactly...

I never took either in high school. I have almost no science background. However I finished calc 3 and linear algebra and currently taking differential equations in a local community college. The chemistry class is high school-level. The physics class requires calculus 2. The school offers...

If atom are invisible then how can one say that atoms are made up of electrons nucleus and quasi particles.

What is the best possible way to learn all the reactions in organic chemistry, where should one start, what are the fundamental topics to be covered and remembered all throughout for building up a great strong base in this part of chemistry?

I'm currently doing a project that involves beer-lambert's law and am confused as to what it actually calculates. So far, my intuition goes as follows: The molar extinction coefficient is for the solvent at a specific concentration and wavelength. In this case, it is blood. And if you have to...

Homework Statement Homework EquationsThe Attempt at a Solution C=C double bonds means that it is not an Alkane because an Alkane is saturated hydrocarbon. So the answer should be from A, B or C.

Homework Statement Using the heats of fusion and vaporization for water, calculate the change in enthalpy for the sublimation of water: H2O(s) --> H2O(g Using the delta H value given in Exercise 24 and the number of hydrogen bonds formed to each water molecule, estimate what portion of the...

Homework Statement Hello ! I've to do a presentation about hydrodistillation. I've already done an experiment in class to extract essential oil of lavender with hydrodistillation. So, for this presentation I would like to do something original. By original I mean things that you're not used to...

Say I dissolve NaOH in water - a very exothermic reaction. Does it matter if I dissolve it in water that is at room temperature or at a different temperature? Will changing the initial temperature of the water affect the dH of the reaction (hence affect the change in temperature at the end of...

Hi guys, i'm a computer scientist with no background in Chemistry and I'm very interested in the field of Physical Chemistry. Do you think i can directly start to study a Physical Chemistry book ? If yes, do you have some books to suggest ?

Is there a reaction of which the product is the catalyst for that same reaction?

Should I take high school physics when I struggled (but wasn't a total flop) in my chemistry class? Hello, I am a high school student in a rigorous high school environment, and I really needed some insight. I took a chemistry course, and the little math stuff that was required in chemistry was...

I tried looking for my unknown (209.70 g/mol) online and couldn't find it. The closest I found were H4O7V2(217.907 g/mol) and HCl2I(198.819 g/mol), but I know I am correct to a 2.7% accuracy. What other lists can I use to solve this?

<< Thread moved from a technical forum, so no HH Template is shown >> Our teacher gave us a lab, and we have to write a procedure on how to test the electrical conductivity of multiple substances. However, on the materials, all that was written was "electrical conductivity tester", which I'm...

Hi everyone, I am a 10th grade student studying in India( would be in 11th in 2 months)I am not very good at chemistry. I have difficulty understanding the concepts. Although I don't have any doubts, I just don't feel confident. Also, my teacher is not very good. Whenever I would ask him...

My question concerns the resultant particles of a co precipitation reaction. What effects occur when you accelerate/decelerate a co precipitation reaction? What are optimal conditions (speed, etc.) for this process? I am interested primarily in the effects on the resultant powder. Thank you.

If you were able to make a substance change colour, or turn from a solid to a liquid, would that be magic? Andrew Szydlo leads us through a world of magical molecules and enchanting elements in this Ri event from Wednesday 23 April 2014.

I have uvex stealth anti-fog chemistry goggles, and in lab the lenses build up with dew. It becomes so bad that I can't see and I have to regularly exit the lab every 15 minutes to wipe them off. I sweat when in the lab, so I'm not sure if that's why . There's no fog, just pure dew drop...

After carrying out reflux and distillation to produce ethyl ethanoate (ethyl acetate) I measured the boiling point and I got 71 degrees Celsius whereas the true value is 77.1 degrees Celsius. Impurities increase the Boiling point (BP) as well as concentration. However my calculates BP is lower...

I'm not a physicist nor an academic, however, the world around me fascinates me. I was watching YouTube and came across an explanation of Bose Einstein condensate, and thought with less space between atoms that would potentially be a better target for creating new elements. So my question is...

Hello everyone, This is my first post and I would like to briefly introduce myself and my situation. I'm 27 years old and a high school drop out, former drug addict, and three time college drop out. I have severe ADHD and insecurities which have made academia too difficult for me to pursue. I...

I'm looking for work published discussing the relationship between von Neumann entropy as well as entanglement with regard to chemical reactivity in the ultracold temperature scales. An article published under the title "Ultracold chemistry and its reaction kinematics" discussed this...

Homework Statement A 529 g piece of copper tubing is heated to 89.5°C and placed in an insulated vessel containing 159 g of water at 22.8°C. Assuming no loss of water and a heat capacity for the vessel of 10.0 J/°C, what is the final temperature of the system [c of copper = 0.387 J/g · K]...

Hi all, I'm new to this site and have seen related discussions, so here goes. I haven't done research before, but I really would like to get into an REU this summer and I am applying to many. I would like constructive criticism on the rough draft of my personal statement please. Thanks in...

Homework Statement You add 1500 cal of heat to a cup of water at 22.5ºC. The water has a mass of 500.0g. What is the final temperature of the water? Homework Equations Q=mcΔT The Attempt at a Solution so i tried solving it by finding the energy of the water Q=(500g)(1.0cal/g)(22.5ºC) Q=11250...

Carbonate leaches are often used in uranium chemistry a way to leach uranium into solution. Thorium dioxide is highly insoluble in everything except hot, concentrated sulphuric acid. Would a carbonate leach work for thorium?

I want some undergraduate level (or postgraduate level will also do) books on physical chemistry. I've got two books: one by Ira Levine and the other by Peter Atkins. But both these books contain only huge amounts of thermodynamics. Other topics are almost not touched upon. I want a book that...

What is the difference between physical chemistry and chemical physics?

Hey guys, I was wondering if algebra based physics will be useful or I will be in a disadvantage? I’m doing a minor in chemsitry and math. So I’m not sure when I will take PCHEM. Probably after partial differential equations I will take it. I’m hoping to take it in fall 2019 or spring 2020.im a...

Homework Statement A tank of constant volume V contains air at an initial density pi. Air is discharged isothermally from the tank at a constant volumetric rate of Q (with SI units of m^3/s). Assuming that the discharged air has the same density as that of the air in the tank, find an...