All Questions

Electron Affinity is defined as the energy change when an electron is gained by an atom

i got this question from my test but i do not know the answer, could someone help me solve this problem please. thank you

I'm trying to increase the pH of the $\ce{AgNO3}$, the only way was using complexation of ammonia and decided to use $\ce{[Cu(NH3)4(H2O)2]^{2+}}$. The only problem is that I don't know if this complex ...

Carbocation stability, organic chemistry knowledge

I am using Sodium dichloro-S-triazinetrione tablets to make sanitizing solutions (approximately 200 ppm available chlorine) and disinfecting solutions (approximately 800 ppm available chlorine). Per ...

Ferrocene will be well known to made members of this site. It consists of two cyclopentadienyl anions sandwiching an iron-II ion. During my first year organic chemistry course (about 40 years ago) I ...

Why is it that when I add yolk (which mostly consists of minerals, vitamins, lipids and proteins) to vinegar and olive oil, it doesn't create a stratification? I'm really confused about this because ...

So, If I have data of intensity of chemical bound signals fixed on every wave length for radiated and non radiated samples, then how can I apply FTIR quantitative method, in order to show how great ...

Example from the Recommendations 2013. Left: Alleged disilazane ; Right: My version Clearer example without obvious flaws in alternative structure. Left: Alleged disilazane ; Right: My version I am ...

I've been interested in infrared and near-infrared camouflage (called multispectral camouflage) for a couple of days now, and I've found a video or two of certain companies that have created fabrics ...

I understand that the mole is an extremely useful way of measuring and understanding atomic quantities. However, I can not find anywhere on the web why is it, that Avogadro's number was chosen as $6....

I have an equation for a reaction to produce hydrogen: $$\ce{CO_{(g)} + H2O_{(g)} <=> CO2_{(g)} + H2_{(g)}}$$ Could you help me to understand why changing the pressure does not affect the ...

What does the value of the pH meter mean when there aren't any hydronium ions in the substance being tested? How does the pH meter show a value which fluctuates as non-aqueous solvents are being ...

In free radical substitution of propane with a halogen (eg- chlorine), how do you know which carbon out of the three ends up with an unpaired electron after fission of C-H bond? This image shows ...

I'm quite new to chemistry and just need to know what type of reaction this is. hydrated copper sulphate [+heat energy] <=> anhydrous copper sulphate + water

I am not a chemistry person at all, so my apologies if my question seems dumb. I am working on the set for a short film and in one of the scenes we would like the main actor to look at a sample of ...

The amount of heat energy required to raise the temperature of 1g of helium at NTP from $T_1 \pu{K}$ to $T_2 \pu{K}$ is? My confusion is, that as the gas is at NTP, therefore, it is an isochoric ...

I notice that generally speaking black bin refuse sacks have a very strong smell. White bin liners have a similar smell though much lighter smell. Green bags which I believe are refereed to as ...

In this question (13) I figured out A,C were wrong and D would be correct choice but I am stuck at finding out products formed in B and also why it would be wrong? Please help.

I am trying to understand the connection between irreducible representations and molecular electronic states. To explain the problem: I found some potential energy curves (PECs) for $\ce{N2+}$ in the ...

I read that the Gibbs free energy of formation of benzene is around $+100 kJ/mol$. Since the Gibbs free energy of formation is positive, benzene is thermodynamically unstable and has a spontaneous ...

Is there any effect on reactants and bond formation due to a reaction going on a adiabatic calorimeter.We know enthalpy of a reaction should be measured at constant temperature but in adiabatic ...

CH3CHO -> CH4 + CO If the required partial pressure of CH4 is given, is it possible to say that CH3CH0 has the same partial pressure because it is a 1:1 ratio?

How many mL of a 0.250M sodium hydroxide solution is needed to neutralize 25.0 mL of a 0.430M sulfuric acid solution? 29.5 mL 43.7 mL 86.0 mL

Here's a problem I'm stuck with - The first step looks like the usual addition of hydroxylamine to the ketone, resulting in two diastereomeric oximes (this is probably what (A) is). Further, in the ...

Which is the theoretical yield (in g) of Ca(OH)2 that can be formed when 3.00 g of calcium are reacted with 8.00 g of water to produce hydrogen gas in the following equation? Ca(s) + 2 H2O(l) → Ca(OH)...

Polar aprotic solvents have a less hindered electronegative atom pointing out, namely oxygen, fluorine, and nitrogen, all of which have lone pairs besides having a partial negative charge. Now, all ...

I have recently read that the number of sterioisomers in a compound having n chiral centres is 2^n. (That is, if no meso form is present) The below question asks for the number of sterioisomers in ...

When studying Kinetic chemistry (and most of the Physical chemistry topics), we often find definitions based upon the mathematical formalism. For example, Order of reaction is often defined as the sum ...

My question is regarding the rarely found(on web) and taught concept of variation. Suppose we have 2 physical quantities A & B which can be measured in their respective units. Since we can ...

in benzene if a EWG is placed then why it is meta directive not para directive since -I effect will be minimum at para position

We recently began covering aromatic electrophillic substitution in my first year organic chemistry course, and we've been discussing the nature of certain functional groups being activating $(\ce{-OH},...

i am finding stoiciometry tougher. i dont understand what is mole concept. How it is related to molar mass, atomic mass unit, gramper mole. Please explain

Say I'm given a mixture of batches of polydisperse polymers. I know the weight $w$, the number average $ \bar M_n$, and the weight average $ \bar M_w$ of each batch that was added to the final mixture....

Ok so I've read that cyclopropane has a higher melting point ~-128°C than propane ~-188°C (Courtesy: Wikipedia). Now I know that cyclopropane is more compact and therefore it's lattice is more stable ...

For the following acids compare the rate of decarboxylation on heating I $\ce{Ph-CO-CH2COOH}$ II $\ce{Ph-CO-COOH}$ III $\ce{CH3-CH2-COOH}$ IV $\ce{HOOC-CH2-COOH}$ I tried this ...

I have a COSY spectrum of a mixture of butanal and butyl bromide and I don't understand why the cross-peaks have various/different splitting on the other sides of the diagonal. I think it may have ...

I had a look at the JCPDS card of BiOCl and saw that there were very small peaks (such as 0.1 percent relative intensity) that I think wouldn't be observed in XRD pattern, they would just blend in ...

I determined the density of a coin, using a ruler with an uncertainty of ± 0,1 cm, and a balance with an uncertainty of ± 2 g. The volume relative error is $$ \dfrac{\Delta V}{V} = 2 \dfrac{\Delta l}...

These are the vibrational modes in BiOCl. I'm trying to account for the each mode, and where in the spectrum you would find such mode. And I found out that at 1400 cm-1 you have asymmetric stretch of ...

I've been having difficulty in this particular question for some time, primarily because I have no idea how the correct option was arrived at: Which of the following is not a planar molecule? (...

is CN--Mg--Br possible?? and can it be used to attach CN- group to alkanes with O= group attched to them already?

Use the data provided to graph the titration curve for 50 mL of a 0.4 M weak acid solution titrated with 0.45 M NaOH solution. From your graph determine the pKa value for this weak acid and report it ...

I want to purchase a siloxane plastic that is permeable to air but not to water. Any suggestions for what I should ask for, or are all waterproof silicon plastics permeable to air? Thanks.

The first line of the Wikipedia article on Organic Chemistry says: "Organic chemistry is a subdiscipline of chemistry that studies the structure, properties and reactions of organic compounds, which ...

There's a rule in determining molecular geometry that says that if the electronegativity of the central atom increases, the bond angle of the molecule increases. Is this is only applicable in the ...

In the following question I need to decide whether the reaction would undergo SN1 reaction or SN2 reaction. I initially thought it would be SN1 since the resulting benzyl carbocation can be ...

why is energy released when a chemical bonds is formed?

If you don't mind me asking about stabilized chlorine dioxide(2% solution). FOR THE INTEREST OF SAFETY AND MAKING SURE PROPER USAGE IS OBSERVED, maximizing efficacy. What is the correct ratio for it ...

Let's say that I have 1 Liter of 100% pure water. A gremlin may or may not have added an unknown amount of an unknown substance and then drained the volume until it returned to 1 Liter. I'm not told ...