Chemical Definition and 1000 Threads

Hi everyone! I basically understand how the materials used in the chemical reaction of a battery work but now I want to know why some batteries have different ratings of voltage. From what I've read, this depends on the materials that are used. What does it mean for some materials to do...

Homework Statement When copper (II) sulfate hydrate, a blue crystalline solid containing embedded water molecules (called a hydrate), is heated in air, it loses the water molecules and the blue solid is transformed to a white anyhydrous (no water) crystal known as copper (II) sulfate.Homework...

For any system where the thermodynamic limit exists, we know that the internal energy U, the entropy σ, the total particle number N and the total volume V are all extensive. Because of this, we know that the Euler relation holds true U = -PV + \tauσ + \muN and that the chemical potential...

I'm about to transfer out of a community college, and so far I got accepted to these two. I'm still waiting on Berkeley, but if I don't get in which of these two would be better if I want to go on to a phd program after undergrad? does it even matter? Thanks.

Hello, So presume we have a system in which a chemical process A + B -> X + Y is happening. We allow it to be a non-equilibrium process (so there will be an entropy production inside the system) but for ease we presume the system is characterized by the usual variables E, V, N_A, ..., N_Y...

Can someone help me understand the concept of chemcial equilbrium. I think I understand in a certain chemical reaction, know matter the amount of reactants or products, the equilibrium constant will remain approximatly the same. I don't fully understand how the equation to solve for the...

hi, can someone help me in understanding the difference between chemical potential and activity? Why it is important to know/determine activities of certain species in material growth? Given that activity is dimensionless quantity, what is it measuring? Also, what is the activity of pure...

Hello. I am trying to choose between studying chemical engineering (MSc) or getting a master's degree as an engineer specializing in math&physics (yes, you can do that in my country). For this I have questions: 1)Are chemical engineers needed in Space agencies? Perhaps working on spacecraft...

I'm only a Junior in High-School, but I know my passion resides in the field of Engineering. I love Trigonometry, Algebra, Chemistry. Whether or not i fail in some areas, and succeed in others, i always come out enjoying a process of learning in those areas. Chemical Engineering in a more...

I've been doing some research on majors and have narrowed my interests down to something involving a mixture of chemistry and math, possibly physics as well. From what I have found Chemical Engineering and Materials Science and Engineering seem to be closest to my ideal mix, though the...

hey guys I'm currently a first year engineering student and am at the point in my undergrad where I need to choose which engineering field i would like to go to. I've narrowed my choices to electrical engineering, material engineering, and chemical engineering. Could you please point of the...

Homework Statement When 1.000 mol PCl5 is intorduced into a 5.000L container @500K, 78.50% of PCl5 dissociates to give equilibrium mixture PCl5, PCl3, Cl2 : PCl5--->PCl3+Cl2 (this eq. is reversible) (a) calculate Kc and Kp (b) if the initial concentrations are [PCl5]=.500M...

hi i was wondering if a carbonate will react with carbonic acid. such as calcium carbonate with carbonic acid: CaCO3+H2CO3CaCO3+CO2+H2O. Thanks for the help!

Hello, I am 25 years old and am returning to school a few years after I received a business degree and working in the upper-management industry. After much debate, I have decided to go back to school and get an engineering degree. I have quite a bit of background in STEM fields from my...

Hello! We know that the sun started with about more than 70% Hydrogen and more than 20% Helium. with other metals consisting the remaining few percent. Now throughout its lifetime, this composition changes, especially with regards to the hydrogen in its core because of nuclear reactions...

Hi everyone Homework Statement I got the three different diagramms (attached below) and I shall find a general chemical equation for all of them. Homework Equations - The Attempt at a Solution I think I know how to do the third one, but I have troubles with the first...

Please don't be bothered by my question, i know it sounds real elementary and it could easily be researched, but after doing so, i haven't been able to find anything on how or why the natural phenomenon of energy release takes place as chemicals react with one another. If you think about it...

Hi everyone; I use usual adhesive tape (like scotch tapes) in one of my project and I want to get rid off the tape and all its remains at latter steps of my work. I want to do it with chemical methods so I used dichloromethane. But it only dissolve the plastic part of the tape but sticky part...

What do you guys think of the Ion Proton 1 developed by a chemical engineer named Jonathan Rothberg? It can supposedly sequence most of a human genome for around $1000 compared to the past where had it costed millions. I don't recall quite clearly, but I think researchers at IBM are...

Hi everybody. I have been thinking about this a while and could not come up with anything. I was wondering if there any chemical energy storage method that would have these properties: 1) it would be easy to produce 2) it would be easy to extract energy from 3) it would not have any carbon...

Homework Statement Show that processes involving rapid chemical reactions are irreversible by considering the combustion of a natural gas (e.g. methane) and air mixture in a rigid container. Homework Equations Q_{in}+W_{e,in}-W_{b}=\Delta U+\Delta KE+ \Delta PE The Attempt at a Solution I...

I have an A.S. in Chemistry and a B.S. in Mathematics and I am considering trying to earn a master's degree in chemical engineer. After working for an analytical lab for six months in sample receipt and prep I have spent a lot of time trying to find ways to improve my career. I understand that...

Are there any major questions yet to be solved in these fields? Also where exactly does thermodynamics, heat fit into physics?Thermal Physics?

Hi everyone, my first post on here. I was hoping someone might have a few words of advice/suggestions. I'm a current sophomore currently pursuing biochemistry/molecular biology. My goal is to work in drug development of some sort, at a biotech company or so. Basically, I like to design and...

2NO + 2H2 --> N2 + 2H2O The concentration of NO is 0.006 M and the concentration for H2 is 0.002M. How can I find the concentration of NO remaining when one-half of the original amount of H2 has been consumed? if you can also show me how it would be done if the reaction was not 1:1, that...

If we use heat and a catalyst to crack water into oxygen and hydrogen, how can the efficiency of the process ever be less than 100%? Every joule that doesn't crack open the bonds and end up in the chemical energy of the products must end up as heat, and then we're back at square one. I'm...

Hi guys I am a student of AP Chemistry. I am trying to understand the effect of temperature on equilibrium. I know that under the change of temperature, the equilibrium will shift to favor the endothermic process if heat is added and vice versa. But employing the Arrhenius Equation, I see a...

Also the chemical involve in the W and iodine. Thx

I’m not very well versed in chemistry so am asking for help. I’m looking for a couple of safe chemicals which combine to react (or dissolve etc.) endothermically. It doesn’t have to be an impressive reaction, it just has to be safe and not produce masses of gas (so that’s carbonate/ bicarbonate...

Copper + NaCl + H20 = >> ? Does anyone have any suggestions on what chemical reaction will occur in above example? Thanks in advance for any suggestions

Hi, wondering if you could help me. I want to find a chemical reaction that would involve: Reactant + Air (or gases present within)----Exothermic----> Harmless gas Any help would be appreciated if you knew of a chemical that I could use to react with air to produce heat and a...

Homework Statement I have a couple of problems here that are all part of one homework problem. A,B,C, and D. I have completed what I believe are the correct answers, but I really don't know for sure. This is an online chemistry class, and it really is not very good. I've watched about 3...

Homework Statement 1) What is the mass of 100% Ethanol? 2) How much ethanol would be expected from 18% glucose solution? 3) What else will be generated? How can we calculate this amount? Given: Fermentation Equation: C6H12O6(aq) + 2C2H5OH(aq) + 2CO2(g) + Heat...

Is this chemical reaction correct? Is such a reaction possible? K4Fe(CN)6• 3H2O + K2CO3 --> 6KCN + CO2 + FeO + 3H2O

We are currently working on a project with flexible PVC wire chop from a metals recycler. with a density of 1.1 -1.35 we are in search of a chemical to raise the specific gravity of 1,200 gallons of water to float the pvc in a separation process. any ideas? thank you

Hi, I am reading about rates of reactions, and I am confused about why we multiply the rate equation of a particular product or reactant by its respective coefficient, only taking the reciprocal of it. Could someone explain to me why this is done? Is it done merely out of convenience?

If I place a glass of white vinegar on the table, and let it make contact with air, Does anyone have any suggestions on what kind of chemical reaction has between air and vinegar? Thanks in advance for any suggestions

a. What do we know about any quantum-physical law, dictating 8 electrons in the outer atomic shell + the other shells' populations, including the 2 electrons in the innermost. Any physical theory behind these numbers, or just an empirical reality ? b. How reacting atoms 'choose' between...

Calculate the amounts requested if 3.3 mol of Fe_{2}O_{3} Fe_{2}O_{3}+2Al\rightarrow2Fe+Al_{2}O_{3} a)Find the moles of aluminum needed b)Find the moles of iron formed c)Find the moles of aluminum oxide formed Not sure how to go about solving any of these the book is terrible and...

Hi, I'm from the UK, and I've almost completed my PhD in Chemical Engineering. I'll soon be 25 years old and I've got my sights set on moving to the USA before I get too old. I could use some American advice on the following: 1) How easy will it be to find an employer in the USA willing to...

Hi I'm new on here and a mature student studying geology. We have an assignment (our 5th one) to be in on the 11th jan . I'm in my 1st yr and have not ever studied chemistry unless you count a couple of years around the age of 11 or 12 which was now roughly 28 yrs ago! Anyway I've been trying...

[b]1. Homework Statement [/b] Hi, I am trying to write and balance the chemical equation between calcium bromide and sodium phosphate. Homework Equations The Attempt at a Solution 3 CaBr2 + 2 Na3PO4 ----> 2 CaPO4 + 6NaBr That was the final step in my attempts. How do I balance...

Well I just finished my Chem Final for the semester, and regardless of my performance, the past week I've been studying everything from the foundational concepts to broader theories. At the end of it all, I feel that I have a much better grasp on chemistry, which does not seem as hard as...

Ok, I thought the only two options in existence were Polar and Non-polar... and I'm being asked which ones are CHARGED? What does this mean? Example: NH4+ (ammonium), NO3- (nitrate), N2, O2, H2O Thanks!

Homework Statement At 25 C a catalyzed solution of formic acid produces 44.6 ml of carbon monoxide gas in 30s. a) Calculate the rate of reaction with respect to CO(g) production. Homework Equations Rate = dC / dT The Attempt at a Solution dC should be expressed in mol/L but I...

How can I measure the chemical potential of a gas (not necessarily ideal), using calorimetry alone? I mean, without knowing any equations of state, being able to measure pressure, temperature, volume, and number of particles. Also, I can add a measured amount of heat energy to the gas using a...

I was practicing some balancing chemical equations for a chemistry test, and I noticed this: Cu(NO3)2 (numbers are subscripts.) I've never seen parenthesis in a chemical formula before, no clue what it means. Nothing in my textbooks, and I can't really ask the teacher since the test is...

Recently, I decided that I am going to do a minor in Computer Engineering (whether it's at Canada or here in Colombia). However, I haven't decided my major. If i win the scholarship in Canada, I would have 2 extra years to choose, but if I stay here in Colombia, I have to choose in May...

Homework Statement 2KClO3 → 2KCl + 3O2 How many grams of potassium chloride are produced if 25 g of potassium chlorate decompose Homework Equations The Attempt at a Solution [SIZE="1"]25g * (1 mole KClO3/122.45 g KClO3) *(74.45g/ 1 mole KCl) =15.2 g KCl is this right??

I am working on a project that needs 2 chemicals to react and change colors. The catch is they most likely need to be or come in a powder form, non toxic, and relatively inexpensive. PLEASE HELP!