All Questions

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0answers
5 views

Reduction of Alkyl halide into alkane

Can we reduced alkyl halide by using Al/Na with base into alkane? RX +Na with NaOH ------------------ RH
0
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0answers
8 views

Ranking basicity from a structure

I just came across this question in my revision. I selected (A) but the correct answer is (D). Could someone explain where I am going wrong? I is least stable --> most reactive --> most basic Cl is ...
0
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0answers
8 views

Electrochemical series Question

Will non-standard conditions (such as 0.25M solutions) change the actual ranking of species in the ECS? Thanks
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0answers
8 views

Molecule with highest no. of different atoms

What's the largest molecule containing highest no. of different elements (atom of each elementoccur not more than once) . The molecule might be unstable but must have been observed. Eg:- HCN satisfies ...
0
votes
0answers
9 views

What is the final volume

A sample containing 2.80 grams of O2 gas has an initial volume of 15.0 mL What is the final volume when 0.500 moles of O2 is added at constant temperature and pressure?
1
vote
1answer
15 views

Rate of change of reaction rate of 0th, 1st, 2nd order reaction?

Does the rate of change of the reaction rate for a 1st order reaction change linearly over time? My teacher says it does, but my textbook seems to contradict this. Could anyone clarify?
0
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0answers
9 views

Pure Hydrogen and Dry Hydrogen Difference

Do pure and dry hydrogen are the same? What does dry hydrogen actually means. And what does pure hydrogen means.
0
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1answer
12 views

Reduction by standard potential

Fe3+ is reduced to Fe2+ by using (A) H2O2 in presence of NaOH (B) Na2O2 in water (C) H2O2 in presence of H2SO4 (D) Na2O2 in presence of H2SO4 How to solve this by standard potential and not cramming?
3
votes
1answer
13 views

How can I prevent my spin-coated silica thin film from cracking when I heat it up?

I am spin-coating a porous silica solution on a glass microscope coverslip, and then heating the resulting thin film to $\pu{350 °C}$, in an attempt to create a thin film of porous silica sol gel. I ...
-1
votes
1answer
21 views

Equilibrium - Pressure Vs. Concentration [on hold]

Does increasing the pressure increase the concentration of reactants as well? If: $$\ce{A(g) + B(g)<=>C(g) + D(g)}$$ Assuming all reactants and products are gases. According to Le Chatelier'...
-4
votes
1answer
22 views

What is the molecular weight of Tris(ethylenediamine)cobalt(III) iodide pentahydrate?

What is the molecular weight of Tris(ethylenediamine)cobalt(III) iodide pentahydrate ? The chem formula is: (Co(en)3(I)3*5(H2O) According to my calculation, it is: 928.77 g/mol. But I am ...
0
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0answers
9 views

Fuel Cell Water Waste [on hold]

What is the quality of the water produced by a Proton-exchange membrane fuel cell?
-2
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0answers
17 views

Determining the name of the gas given Liters of gas and mass of balloon? [on hold]

How would I answer this? I keep getting stuck! A red balloon holds 2.45L of gas. The following data were collected at 25°c and 760mmHg: mass of empty balloon = 3.00g, mass if balloon and gas = 3....
-1
votes
0answers
14 views

Transition metals and color

Which one of the following transition metal oxides is NOT colored? a) CuO b) FeO c) TiO2 d) Mn2O3 answer is c. book explains that Ti in TiO2 has no d electrons, which otherwise can undergo energy ...
0
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0answers
17 views

why is methane gas solubility in water higher than carbon monoxide solubility in water?

The above graph depicts solubility in water at various temps. If we are dissolving in polar water, why is methane more soluble than a polar molecule like carbon monoxide?
-2
votes
0answers
18 views

What is the major product in the given reaction?? I cannot figure out why d is the answer?please help me out [on hold]

I cannot figure out how the hell d is answer According to me b must be the answer due to +i effect.
-1
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0answers
10 views

does nikel manganese cobalt have electron share in li-ion batteries [on hold]

does nickel manganese cobalt have an electron share to the lithium ion inter calated, in the production of 4 volt potential NMC batteries
-1
votes
0answers
29 views

Radius with Bohr model

$$r_n = \left(\frac{h^2}{4\pi^2me^2}\right)\times\frac{n^2}{Z} $$ Would I be able to calculate the radius of sodium ion ($\ce{Na+}$) with the help of the above Bohr atomic model formula?
-1
votes
1answer
30 views

How does a change in the surface area of the electrodes affect the voltage produced by a galvanic cell?

I did a lab where I increased the surface area of the electrodes in a galvanic cell, that resulted in an increase in voltage. However, I have been reading and that is not supposed to happen. I am a ...
7
votes
2answers
465 views

What is the smallest molar volume? [on hold]

I wondered how small a volume a mole of material could occupy, so I started with carbon, which would need 12 grams. That's 60 carats, and there happens to be a famous 60 carat diamond. If my density/...
-2
votes
1answer
17 views

Why does lithium have high reduction potential values? [on hold]

I read about this somewhere that low wellies a reduction potential means it’s more reducing nature. Since it’s known that lithium is a strong reducing agent how can with him have high reduction ...
-1
votes
0answers
21 views

Linear Equation for an Overall Third-Order Reversible Reaction

For the reaction: aA <--> bB With reaction order (m) with respect to substance A; m = 2 (forward reaction) and reaction order (n) with respect to substance B; n = 1 (backwards ...
-1
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0answers
11 views

FUNCTIONALIZATION WITH FERULIC ACID [on hold]

I am going to fuctionalize my two different surfaces with ferulic acid. One of the surfaces has OH groups and another surface has COOH groups. Can Ferulic acid covalently attache to these surfaces?
2
votes
1answer
39 views

Unusual oxidation states of alkali metals

When going through list of oxidation states on Wikipedia I encounterd there that sodium, potassium, rubidium and caesium exhibit oxidation states of -1, but not lithium, even though its ...
-2
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0answers
15 views

Universal Gas Equation + Stoichiometry [on hold]

Could someone please solve the following questions for me? Use the universal gas equation to calculate the volume of the greenhouse gas, $\ce{CO2}$ (measured at $\pu{25°C}$ and $\pu{101.3 kPa}$), ...
0
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0answers
11 views

Can i apply resin & hardner on cement toy? [on hold]

This is ganesh from india, as i need to make an water fountains of height 4 feet in which i made with thermocol (i.e) styrofoam and i carved to fountain shape and i initially coated with white cement ...
-1
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0answers
17 views

Are iodoalkanes non polar given that the electronegativity difference between carbon and iodine is negligible?

According to my understanding, the electronegativity difference between two compounds must be somewhere between 0.4 and 2 to be considered polar, greater than 2 to be ionic and lesser than 0.4 to be ...
0
votes
1answer
36 views

Electrosynthesis of HCl?

I was attempting to synthesize hydrochloric acid and it seems to have formed another form of chlorinated acid. The smell is more of chlorine and is extremely powerful. I got some on my jeans and it ...
0
votes
1answer
48 views

How is preparing a buffer possible?

I understand the concept of an equilibrium buffer solution, however I am a bit hung on how creating it doesn't shift the weak acid equilibrium. $$\ce{CH3COOH + H2O <=> CH3COO- + H3O+}$$ $$ K_\...
0
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0answers
23 views

Theoretical Calculations for Potential Generated in Salt Water Battery

I am using a $\pu{1.5 M}~\ce{KCl}$ solution as electrolyte and copper and aluminium electrodes but no salt bridge. So basically there is only one beaker with the two electrodes in it with the $\pu{1.5 ...
-1
votes
0answers
11 views

Is my mechanism for the reaction, where FabH catalyzes it in fatty acid biosynthesis, complete and correct?

I need to write a mechanism for the following reaction. In this reaction, FabH is the protein that catalyzes the reaction in fatty acid biosynthesis. The beta keto carboxylic acid decarboxylates to ...
-2
votes
1answer
16 views

If internuclear axis is z-axis then HOMO orbital of CO is [on hold]

I have solve this ques. , my answer is 'sigma2pz' but answer in book given is N.B.M.O(Non bonding molecular orbital . Please explain me this concept.
-2
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0answers
19 views

Hydrogen and oxygen gas are hydrophilic or hydrophobic? [duplicate]

My friend told me oxygen gas is hydrophobic, hydrogen gas is hydrophilic gas, is this true? How to explain it?
0
votes
1answer
35 views

Differences between ¹³C-decoupled NMR experiment vs a ¹³C-coupled

How does the acquisition time changes between $\ce{^{13}C}$–decoupled NMR experiment vs a $\ce{^{13}C}$–coupled? Would the acquisition time be longer if a decoupling of the protons (H) is carried out?...
-2
votes
0answers
15 views

Concentration of NO2 [on hold]

The signal from a chemiluminescene analyser for NO is proportional to the concentrations. The instrument gave a signal of 135uA for an air sample that was passed over a thermal converter and 49uA with ...
-1
votes
1answer
29 views
0
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1answer
45 views

Melting Point of Pure Gold [on hold]

The melting point of gold was changed from 1063 deg C to 1064 deg C in an ASTM procedure that uses the melting point of gold as the end point for a test. Did the melting point change somehow or was ...
1
vote
0answers
47 views

Know if a molecule is viable with Python [on hold]

I'm working with python and I'd like to know if someone knows a python module which is able to check if a molecule is chemically viable (valence, connectivity constraints ...), or not. I know there is ...
-1
votes
0answers
8 views

How to calculate the mass of products or reactants [on hold]

What mass of sodium chloride is produced when 10.6g of sodium carbonate is reacted with excess hydrochloric acid? Very stuck with this one...
0
votes
1answer
36 views

what the solution of this problem, negative absorbance values in UV-vis spectrum

In my project, I take the UV-visible spectrum of reaction between pyridinium chlorochromate and N-acetylcysteine. In some wavelengths, the absorbance value is negative for example it is (-0.006, -0....
1
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1answer
27 views

Mechanism for Bial's test

In biochemistry laboratory, it's common for undergraduate students to perform identification of carbohydrates and its functional groups. Bial's test, a method to check if any pentose is present, is ...
0
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0answers
13 views

Electro Osmosis Questions [on hold]

I am thinking about using electro osmosis to move some salt water from one side of a membrane to another like in the diagram below. I don't really know much about the subject and I have a few ...
-1
votes
0answers
23 views

Atoms releasing energy [on hold]

How does an atom release energy? When the electrons in an atom goes from one shell to another then light is released. How is energy released?
-1
votes
1answer
29 views

Nomenclature of an organic compound with benzene and double bonds

How would the following compound be named? Attemp of solution I believe is 4-phenyl-1,2-pentadiene
-1
votes
1answer
28 views

Alternative solvents for TLC [on hold]

If you were tasked with performing TLC, but the lab that you were working in was out of hexanes and ethyl acetate, suggest two alternative solvents that could be used. Indicate which of the solvents ...
-1
votes
0answers
20 views

Degradation of Avibactam and Tazobactam Due To Gamma Radiation [on hold]

Based on their molecular structure, which chemical is more prone to degrade when exposed to gamma radiation... Avibactam or Tazobactam? A link to the structures is below.
2
votes
1answer
37 views

Why does camphor sublimate?

I was doing a laboratory experiment the other day and they asked us to heat a beaker that contained camphor and to cover it with a watch glass with ice on it. I understand the crystallization ...
-2
votes
0answers
12 views

Quantum and Electronic configuration query [on hold]

Write the set of quantum numbers that describes an electron located on the fourth energy level of the d sub-shell and that has a spin-down
0
votes
1answer
55 views

Breaking the first law of thermodynamics? [on hold]

$$\ce{3MnO2 + 4Al -> 3Mn + 2Al2O3 + \text{heat}}$$ Here, by balancing the equation, we are trying to mean that all the atoms in the reactants are present in the products too, but there is extra ...
0
votes
1answer
46 views

E - Z configuration of cyclic substituents [on hold]

The answer is coming out as Z but given is E. I’m not sure where I’m wrong at this point as I moved along one chain at a time and wanted to follow heaviest atom as earliest as possible !

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