All Questions

Filter by
Sorted by
Tagged with
0
votes
0answers
7 views

Spectrochemical Series

In coordination chemistry, we talk about a spectrochemical series to indicate the strengths of the ligands. Is there any way I can remember this series, maybe based on other trends I'm familiar with, ...
-1
votes
0answers
10 views

Bonding in d10 metals such as Zn

I recently learned about the MO bonding model in metals, where many metal atoms form lots of orbitals close in energy that form bands. However, I can't understand the bonding in d10 metals. It seems ...
-1
votes
0answers
6 views

Relationship of dipole moment with heat

Of the conformers of 1,2-dichloroethane, what will happen to the net dipole moment of the sample when it is heated. My teacher told that when we heat the mixture of conformers of 1,2-dichloroethane, ...
-1
votes
1answer
12 views

Devarda's alloy procedure

Hello dear I have a small question I want to do kjeldahl distillation for a 100 mL sample of water after reduction with devarda's alloy to measure the concentration of nitrate nitrogen... I want to ...
5
votes
1answer
24 views

Rusting in every other bar

I have noticed that, when a structure with bars (such as a gate or a grate) develops rust, this sometimes happens differently across the bars. In particular, it seems that the bars are alternatively ...
-1
votes
0answers
16 views

Entropy change as temperature changes under isobaric conditions

everybody: I have this question that is definitely a challenge for me and I was looking for some help. I did manage to do part a but I'm not sure if it's correct. Part b is even harder for me. I'm not ...
-2
votes
0answers
20 views

Why does taking reactants in stoichiometric ratio result in maximum amount of products?

I came across this example: For obtaining maximum mass of NO2 from a given mass of a mixture of NH3 and O2, the ratio of mass of NH3 and O2 is taken to be in the ratio of their stoichiometric ...
0
votes
0answers
11 views

Detecting impurities in polyethylene glycol 3350

I would like to test samples of polyethylene glycol 3350 ($\ce{H−(O−CH2−CH2)_n−OH}$ with an average molecular weight of 3350, so n is around 75) to determine if there are any impurities and if so the ...
-1
votes
0answers
32 views

Solubility and solubility product

Experimentally, the specific conductance of a saturated $\ce{AgCl}$ is $\pu{3.41e6 S/cm}$ and the water conductance is $\pu{1.61e6 S/cm}$. The molar conductance of $\ce{Ag+}$ and $\ce{Cl-}$ ions are $\...
-1
votes
0answers
27 views

What does elliptical character mean in relation to atomic shells? [closed]

I saw this question but I don't know what I need to do- "Which of the following values of n have the highest elliptical character- 4/3/2/1"
0
votes
0answers
21 views

Is Raoult's law applicable above the boiling point?

I cannot find the answer to this anywhere. But my logic says that as Raoult's law is based on the fact that below boiling point only the particles on surface escape by gaining energy so the vapour ...
-1
votes
0answers
30 views

Determining an inorganic compound that has unpleasant smell

$\ce{H2S}$ smells like rotten eggs, $\ce{Cl2}$ has an odor of a bleach and $\ce{NH3}$ which produced in the following reaction has a smell of household cleaners: $$\ce{NH4Cl + NaOH -> NH3 + NaCl + ...
-3
votes
0answers
29 views

Tried to make calcium acetate out of eggshells and vinegar but I did it wrong. How many ways are there to make the jelly?

I was trying to follow a handful of online tutorials showing how to make a flammable jelly-like substance out of eggshells mixed in vinegar, but I think I did it wrong. I put regular, unboiled ...
0
votes
1answer
46 views

Forcing atoms closer together

Is there a method in chemistry to alter the energy of atomic bonds by forcing atoms closer together in a smaller volume? Similar to how pressure squeezes atoms closer together.
-2
votes
0answers
17 views

50mM in 0.5% of 3ml? [closed]

I want to make cell culture supplement containing 50uM, 100uM, and 200uM of X (molecular weight 346.46) in a final volume of 0.5% DMSO to go into 3ml media. X needs to be dissolved in DMSO or it won't ...
-1
votes
0answers
11 views

2.000 mol of helium is expanded adiabatically and irreversibly at a constant external pressure of 1 atm [closed]

2.000 mol of helium is expanded adiabatically and irreversibly at a constant external pressure of 1 atm from a volume of 5 L and a temperature of 273.15 K to a volume of 25 L. Calculate ∆S, ∆Ssurr, ...
-2
votes
0answers
16 views

Rate of Reaction in Chemical Kinetics [closed]

Why is Rate of Reaction always positive?..I had doubt in the graph of concentration vs time graph of reactant. If we draw a tangent at any point in the exponential decreasing graph of the same the ...
2
votes
0answers
31 views

H NMR signals in 1,4-dichlorobutane spectrum

I have come across H NMR spectrum of 1,4-dichlorobutane and I have noticed that signals there are different to what I would intuitively expect. Instead two triplets there are two multiplets of more ...
-3
votes
0answers
22 views

Term symbol for atomic oxygen

Term symbol for atomic nitrogen: why can't S be -1/2? Term symbol of nitrogen by the method in this link how do i get term symbol of oxygen? No matter how much I do, I can't get the answer
1
vote
1answer
47 views

Do formic acid and phosphorus pentoxide react at room temperature?

If I add phosphorus pentoxide to formic acid at atmospheric pressure and 20°C will they react? At what rate will CO be produced? I have not been able to find a reference discussing this.
-1
votes
0answers
21 views

does acetic anhydride react with ester or aldehyde? and how?

i was asked to complete the reaction in the presence of acetic anhydride and i am not sure with which functional group will it react, ester or aldhyde. and forming what? i completed the first step by ...
-2
votes
0answers
14 views

What are the reasons for nitrogen oxides to be monomeric and nitrogen trioxides and nitrogen peroxides to be dimeric? [closed]

Nitrogen oxides are monomeric whereas nitrogen trioxides and nitrogen peroxides are trimeric. Why?
0
votes
0answers
16 views

Simulation of Pyridin attached to gold atom

I would like to simulate to get the influence of a gold atom on the oscillation modes of pyridine. I have already carried out simulations in which there is a coordinative bond between nitrogen and ...
-2
votes
1answer
24 views

A gas A having vapour density 50, decomposed to produces two gases B and C.After complete decomposition, vapour density of gaseous mixture is ​? [closed]

I approached the question by taking average molecular mass of b and c as 50 .so their vapour density is 25 each.so vapour density of mixture will be 25+25.But the answer is 25!
-1
votes
1answer
20 views

P4(g)+5O2(g) gives P4O10(s) if pressure is increased the equilibrium will shift to products or reactants? or no change?

I know that when pressure is increased the equilibrium should shift to the way where there is less number of moles of gas but here the less number of moles are in solid state so would no change happen ...
-2
votes
1answer
38 views

Why aren't the pi electrons delocalized in cyclopropene?

I was searching on the internet whether cyclopropene is aromatic or not. I found out that the electrons are not delocalized, causing the molecule to be non-planar and so forth, a lot of reasons. But I ...
0
votes
0answers
8 views

API's for Materials Project to get data like atomisation enthalpy ,fusion enthalpy etc

I have been working on designing new materials with specified elastic properties with ML. and I'm in search of data to do the same. I have tried Materials API, but apparently it supports only few ...
-1
votes
0answers
25 views

Is there a way to convert the dissociation constant (Kd) to the Flory Huggins Interaction Parameter (chi) or visa versa?

I'm trying to figure out a way to convert the dissociation constant (Kd, Units: nM) in the form ([A]^x[B]^y)/[AB]into the Flory Huggins interaction parameter (Unitless) but I can't seem to find any ...
-3
votes
0answers
12 views

Can nitrobenzene react with HNO3 in the presence of H2SO4? [closed]

I have a worksheet with reactions that we are supposed to finish and one of them is nitrobenzene plus HNO3 with H2SO4 as the catalyst. He says some of the reactions may result in no reaction and I'm ...
1
vote
2answers
51 views

Raman signal of black matte object

This is the raman spectrum of the black cap: I was expecting it to be Polypropylene but the peaks didn't match in wave numbers. Anyone got idea what kind of plastic has that peaks on the side of 1500?...
-2
votes
0answers
19 views

I we multiplied Equation 3.34 the wave function from the left .Does it make any differer whether we multiplied from the left or the right?of [closed]

Please help me to answer this question...[![enter image description here][1]][1] when I multiple on the right the operate give different functions ,where as in the left it give sandwiches operator ...
-1
votes
0answers
27 views

How to compare the strength of ionic compounds ( ClF3 and SO2)? [closed]

The electronegativity difference between Cl and F,S and O are same , but why is SO2 more ionic than ClF3?
1
vote
0answers
20 views

Reaction of mixed carbonyl compound with ethylene glycol in acidic medium

I Know that there is cyclic ketal or cyclic acetal is formed when carbonyl compound reacts with ethylene glycol. But I am confused here because I am unable to decide what will be the major product ...
0
votes
1answer
50 views

Azimuthal Quantum Number

In the radial equation of hydrogen atom the differential equation is described by But why is l taken to be integer. I know the principal quantum number n correspond to energy levels so that's why it'...
-2
votes
0answers
11 views

How many atoms of sulfur are in 3 moles of sulfur molecules? [closed]

How many atoms? It is correct to say that the answer is 3 * 8 * 6.002 * 10^23?
1
vote
2answers
68 views

Are there any “catalysts” that decrease the rate of reaction [duplicate]

Catalysts are things you can add to a reaction that provide an alternate reaction pathway for the reaction that decreases the overall activation energy of the reaction meaning the reaction is faster ...
0
votes
0answers
32 views

IUPAC nomenclature of cycloalkadienes with substituents and alkenes on the same carbons

Consider the following organic compounds: Compound $(1)$ has two double bonds, which I'll label $C1$ and $C4$ such that the methyl group is attached to $C1$ and thereby assign lowest numbers to all ...
0
votes
2answers
43 views

Is it safe to combine sodium hypochlorite (bleach) sodium triphosphate (TSP) for cleaning?

I've heard this combination can be particularly effective at cleaning biofilms, perhaps because the TSP is a surfacant, allowing bleach to "attack" more layers of the biofilm. However, I'm ...
5
votes
0answers
15 views

Molecular orbital diagram for carbene-metal and carbodiphosphorane-metal interaction

I am interested in understanding how carbenes and carbodiphosphoranes interact differently with a transition metals. I would like to use qualitative molecular orbital theory arguments (with an ...
-2
votes
0answers
12 views

Energy required to break all of the bonds in 94g of NH3? [closed]

So, I'm assuming I'm way off but!... What is the energy required to break all of the bonds in 94g of NH3? If H-N = 388 kJ mol^-1 and I know it's made up of 3 lots of this. So, I've done this = 3 X 388 ...
-1
votes
0answers
14 views

Can the gaseous form of Na2O be considered a superbase comparable to bases such as LiO anion? [closed]

Lithium oxide anion is considered the 4th strongest base known as the conjugate base of lithium hydroxide. Assuming the basicity comes from the O2- ion as the conjugate base of the hydroxide ion, ...
-1
votes
0answers
11 views

Calculate the average atomic mass and identify the element from periodic table [closed]

An element consists of 62.60% of an isotope with mass 186.956 u and 37.40% of an isotope with mass 184.953 u. Calculate the average atomic mass and identify the element from periodic table
-2
votes
0answers
18 views

Acrylonitrile vs Glass-Reinforced nylon base Sediment Filter Housing

Sediment filter housing is made either with the regular Acrylonitrile and a glass-reinforced nylon base housing for warm or hot water. Regular Acrylonitrile looks like this. The glass-reinforced ...
3
votes
2answers
48 views

MO diagram when three orbitals of the same symmetry is allowed to mix

How exactly should we combine three orbitals when we have three orbitals that are of correct symmetry to interact? Take $\ce{H2O}$ for example. $\mathrm{2s},$ $\mathrm{2p}_z$ and the $A_1$ group $(\ce{...
-1
votes
0answers
35 views

internal energy and temperature in a chemical reaction [closed]

Why is the internal energy of a system NOT a function of its temperature if the number of moles of each species changes (i.e. it undergoes a chemical reaction)?
-1
votes
1answer
22 views

Does potential energy of molecules increase or decrease when covalent bonds are formed or broken? [closed]

My sir told me that when bonds are formed or broken , average separation between particles comes closer or decreases when they are broken.I see there is a lot of change in K.E but how is there change ...
0
votes
2answers
41 views

How can we prove the inequality TdS > dU + pdV?

I know that for reversible process $$T\,\mathrm dS = \mathrm dU + p\,\mathrm dV,$$ but since all the terms in the given equation are state variables so the above equation should also be true for ...
-3
votes
0answers
18 views

explain why the boiling temperature of hydrogen fluoride,are much higher than those of similar compounds in the following periods [closed]

Chemistry explain why the boiling temperature of hydrogen fluoride, in ammonia and water are much higher than those of similar compounds in the following periods
3
votes
0answers
18 views

Best way of studying protonation in non-polar solutions with ~100ppm of water present using computational methods?

I am currently looking at the mechanism of the formation of storage deposits in jet fuel. Interestingly, the concentration of acids in the fuel correlates strongly with the total insolubles formed ...
-3
votes
1answer
42 views

chemical equilibrium(le chatelier's principle) [closed]

My doubt is regarding Le-Chatelier's Principle. Let's say we have a reaction $$\ce{A + 2 B <=> C + D}$$ When we increase the total pressure of the reaction, as per Le Chatelier's Principle, the ...

15 30 50 per page
1
2 3 4 5
725