# All Questions

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54 views

### Walk Me Through This Problem Please [closed]

1) Calculate the number of grams of Fe that are produced when 57 grams of FeO is reacted with excess aluminum in the following reaction: 2Al(s) + 3FeO(s) -> 3Fe(s) + Al₂O₃(s) 2) Calculate the number ...
22 views

### Formation constant of Eriochrome Black T Complexed with Pb (II)

What is Eriochrome black t’s formation constant when complexed with Pb (II)? If Eriochrome was placed in solution with a metal ion complexed to NH3, would Eriochrome likely replace NH3 via ligand ...
17 views

### stability of cabergoline /dostinex [closed]

How stable is the following molecule, cabergoline? I'm wondering about the potency of expired medication (Dostinex) in which it is the active ingredient.
27 views

### Formal Charges on Split Anions? [closed]

The carbonate anion $\ce{(CO3^2-)}$ Has 3 oxygen atoms with a total formal charge of $-2$. I was taught that formal charges had to be whole numbers. Even so, it appears each oxygen atom has a formal ...
25 views

### Why is L-lysine only sold as L-lysine HCl and not as base (cf. L-arginine)?

Both L-lysine and L-arginine enjoy popularity as supplements, but only the latter is sold either as HCl or as base. Given that L-arginine is even more basic than L-lysine (pH 12.5 vs 10.5), that is ...
49 views

### True muonium energy levels [closed]

In a true muniom(muon-antimuon atom) do the energy levels match with that of the hydrogen's? The core is lighter for about 100 times but the muon is 100 times heavier than the electron so it would ...
17 views

### Assuming what is the freezing point of a solution of dibromobenzene, C6H4Br2, in 0.250 kg of benzene, if the solution boils at 83.5 °C? [closed]

Assuming ideal solution behavior, what is the freezing point of a solution of dibromobenzene, C6H4Br2, in 0.250 kg of benzene, if the solution boils at 83.5 °C? Benzene boiling point: 80.1 C Benzene ...
16 views

### Titration Determination of Ka [closed]

If 20.8 mLs of a 0.10 M solution of NaOH is needed to completely (100%) neutralize 10 mLs of a weak acid solution, how many mLs of the 0.10 M NaOH solution is needed to neutralize 50% of the weak acid ...
7 views

### Stability of cabergoline [closed]

[![cabergoline ][1]][1] How stable is this molecule, the medication cabergoline? Wondering how safe it is past expiration.
14 views

### Titration and Neutralization percentages [closed]

When one adds a 0.10 M NaOH solution to a weak acid solution, a portion of the weak acid solution is neutralized. If 20.8 mL of a 0.10 M solution of NaOH is needed to completely (100%) neutralize 10 ...
61 views

### Finding the pH of a solution

What are the steps we go about in finding the pH of a solution of Strong base and a salt of a Weak base and Strong acid? Here is the question that I've been given Find the pH of a solution made ...
30 views

### Arsenic bound proteins confirmatory test

I want to confirm the presence of arsenic in some protein samples, apart from the marsh test can I use the following method?-- Arsenic is present as arsenic (III) ion in the samples. Hydrogen sulfide ...
157 views

### Why is 3,6-dimethylpiperazine-2,5-dione optically active in spite of having a centre of symmetry?

I learnt in my chemistry class that if a molecule has an element of symmetry (either a plane of symmetry or a centre of symmetry), it will not be chiral and hence will not show optical activity. My ...
56 views

### Is it possible to remove dissolved chlorine from water? [closed]

So recently I was trying to disinfect water by adding bleach to it but accidently I added too much of bleaching powder. So now the water has a very pungent odour. Is it somehow possible to decrease ...
22 views

### How would you describe the energy of solution formation involved in the dissolution of sodium chloride in vinegar?

I have found that the lattice energy of dissolving salt in water is 779 kJ/mol. While 774 kJ/mol is its hydration energy. Subtracting the two values gives a positive number therefore dissolving table ...
30 views

### Will UVC harm smartphone's screen (especially OLED, AMOLED ones)? [closed]

I'm curious if UVC (with wavelength of 260-280nm) can in any way harm smartphones? There are this type of sanitizer products, like 59S S2, which are good for sanitizing small items, including ...
27 views

### Temporary tattoo onto skin [closed]

I'm Martin I printed an image and I want to have it tattooed on my skin In your opinion, what material should I use to transfer the image to my skin? I had already seen a video on the internet about a ...
17 views

### Does choline bitartrate react with hydrochloric acid?

Choline hydroxide is a base and reacts with HCl to form choline chloride salts and water. I am wondering if choline bitartrate can also neutralize HCl. In case it doesn't, is there any other cheap ...
25 views

### Non-toxic organic bases? [closed]

I am trying to find out if there are any non-toxic organic bases that could be given orally on a non-empty stomach to treat acidosis. From my research, histidine and diluted choline hydroxide were the ...
18 views

### Seeing solubility in various cases

[![enter image description here][1]][1] Question is in the image 'match' each option having multiple answers. I have invested a considerable time over this but couldn't solve it. Anyone explaining how ...
14 views

### Steric Inhibition of Resonance effect on Dipole Moment

How does steric inhibition of resonance (S.I.R.) cause dipole moment of the compound to decrease? Dipole moment $\vec{\mu}$ is defined as $q \vec{l}$, where $l$ is the separation between the charges ...
67 views

### How the experimentally determine the elemental composition in fingernails?

I am doing a project in my highschool about analysing C/N and C/S ratio of finger nails of various ages and sexes. Please suggest me a way to do this. I don't know where to start, I know the various ...
38 views

### Why does covalent bonding satisfy atoms?

Having to retake an introductory chemistry course has gotten me thinking. Covalent bonding is where electrons are shared between two atoms that both want more electrons. Let us take $\ce{O2}$ as an ...
35 views

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### Should I relate the number of moles between substances when converting weight units?

Good day! I graduated from an undergrad degree of chemistry almost 3 years ago but I'm frustrated that I fail to reconcile these things: In gravimetric analysis, to get the correct amount for the ...
20 views

### How does actually negative charge travel in phenol from ortho to para to ortho? [duplicate]

When we say negative charge flows from ortho to para position, and electron density at ortho and para is more, where does electron actually stay at ortho and para? Is it at $p_\mathrm{z}$ orbital or ...
22 views

### We know that single bond,double bond structure of benzene doesn't exist then why we use it? [closed]

No explanation needed question is straight forward
30 views

### How to properly model a mechanochemical reaction of barium titanate and copper(II) complexes?

I would like to understand, in terms of chemical kinetics, how I could equate the reaction rate between $\ce{BaTiO3}$ and copper(II) complexes under ultrasound effect. Examples in literature would be ...
17 views

### Phase purity using XRD measurements [closed]

I want to know the XRD values in order to calculate the phase purity values of ABO3 perovskites, Is there a database of known XRD measurements or phase purities?
30 views

### Molecular antibonding orbitals energy

When we heat hydrogen the energy of the molecular orbital of H2(1s) is increased .What happens to the energy of the antibonding molecular energy of hydrogen(1s*)?
33 views

### Which is a better electrolyte for electroplating copper? [closed]

I need to know which is a better electrolyte to use when electroplating copper: copper sulfate or copper nitrate?
39 views

### Solution of a first- and second-order consecutive reaction scheme

I have a compartmental model system X, a simplified version of which, looks like this:  \text{System }x: \enspace \text{STO} \xrightleftharpoons[k_2]{k_1} \text{blood} \xrightarrow[]{k_3} \text{...
36 views

### Chemoselectively dihydroxylate a terminal alkene in the presence of an internal alkene?

The goal is to dihydroxylate the exo alkene, and then convert to a ketone. Any suggestions would be apprecitated to either chemoselectively convert the terminal alkene, or directly convert the ...
14 views

### Chemistry involving lab [closed]

I am having problems finding:: Percent silver in alloy? Mass of copper in copper oxide? Mass of copper in alloy? Percent copper in alloy?
27 views

### How much sodium hydroxide would it take to dissolve one tonne of bauxite? [closed]

Generally speaking what proportion of NaOH would be typically required to dissolve one tonne of crushed bauxite of average purity? Also are varying quantities required for gibbsite, böhmite and ...
39 views

### Why doesn't water wash off the coronavirus alone? [closed]

So the coronavirus has a lipid bilayer where the hydrophilic heads are facing outward. So why can't water just stick to these ends and flush out the virus particles from our hands? Is it because our ...
31 views

### what is the relationship of Salt, White Vinegar and Water to create 1 liter of Hypochlorous Acid [closed]

What is the relationship of Salt, White Vinegar, and Water to create 1 liter of Hypochlorous Acid (for disinfecting and cleaning purposes), and how much time do I have to put it under a 9v battery ...
18 views

### Difference in a array of probability density plots for the electron in its lowest-energy states of Hydrgen atom [closed]

Dynamic Periodic Table If you visit Dynamic Peridic Table, You will notice that for n=4 l=3,2 m=0,0, and n=2,l=1, m=0 there is a difference in the probability density plots for electron in its ...
18 views

### Interpreting phase diagram of mixture of partially-miscible liquid that boils before complete mixing

Source: Atkins' Physical Chemistry, 8th Edition, P.188 This is an example given by the stated reference book. Interpretations on this phase diagram is given. An extract of the interpretations is ...
33 views

### Why does Sodium Bicarb. Reduce Combustion Rate?

In many common solid-propellant model rocket engines, Sodium Bicarbonate, $\ce{NaHCO3}$, is used to predictably regulate/limit the rate of combustion of the fuel. My questions are as follows: What is ...
34 views

### Change in Entropy and Enthalpy found over a temperature range and asked to compute the change in Gibb's Energy

I was given the following question by my tutor: "The variation of enthalpy ($\Delta H$) and entropy ($\Delta S$) in a reaction carried out at constant pressure in the temperature range between 300 ºC ...
26 views

### What is the best way to go about matching proton-NMR spectra to molecules?

I've attatched an example question. I have already solved this one, I'm wondering about what, in your experience, is the most time-efficient way of approaching a question like this one. I can solve ...
I had a question about nonpolar molecules that have symmetrical dipole vectors. Let's take $\ce{CO2}$ as an example. Each of the $\ce{C=O}$ bonds are pulling in the opposite way. My teacher says that ...