All Questions

1
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0answers
26 views

Pyrophoric nature of Raney Nickel

I am about to do a hydrogenation lab, and a, struggling with how to prepare my Raney Nickel so it does not spontaneously ignite during my lab. Most websites say to just submerge it in water– is this ...
1
vote
1answer
36 views

Identifying Lewis acid

What is the Lewis acid on the reactants side? $$\ce{HNO2(aq) + HPO4^{2-}(aq) <=> NO2-(aq) + H2PO4-(aq)}$$ The book says it is the $\ce{H+}$ only, not the whole molecule of the nitrous acid, ...
2
votes
1answer
35 views

Techniques to extract lipids

I am planning an experiment on how to isolate casein and part of the process involves removing any lipids that may still be in it after filtering the precipitated casein out of the milk. I have read ...
0
votes
1answer
49 views

What is the logical way to understand Iso, Sec, Tert and Neo prefixes?

I'm only familiar with Alkanes at a basic level currently. What seems logical to me is that an Alkyl molecule with the: "iso" prefix means its an isomer of that alkyl, the usual way i'd see it would ...
2
votes
1answer
74 views

Possible erratum in solutions to Orbital Interactions in Chemistry 2ed [closed]

I was attempting the problems in Chapter 1 of Orbital Interactions in Chemistry, and found a slight problem. ftp://ftp.wiley.com/public/sci_tech_med/orbital_interactions_2e/Chapter%201%20-%20Answers....
-1
votes
0answers
19 views

game theory for traffic management [closed]

I am a college student who is writing a paper about a real-life example that you can demonstrate with game theory. It can be an example from the past, present and future. The reason why i am coming ...
-1
votes
0answers
20 views

Homolysis of Peroxide bond in this conversion: [closed]

So, are the first two steps possible? We know that O-O bond is unstable and so it should break easily upon supply of energy. Also, can you explain why the peroxide bond is so weak?
-2
votes
0answers
16 views

Using SF6 to prevent oleaginous nuts to turn rancid [closed]

I am usually keeping nuts and various seeds in glass jars. I noticed that oleaginous nuts turn rancid after 6-8 months due to oxidation. I am wondering how much I can prevent oxidation by replacing ...
2
votes
1answer
36 views

Does hyperconjugation into sigma-star explain methylamine's increased basicity relative to ammonia?

The inductive effect with the polarisation of the C-N bond obviously plays a role in stabilising the positive charge of the conjugate acid. But given the similar electronegativities for C and H, CH3 ...
-2
votes
0answers
11 views

Concentration with prior dilutions [closed]

I diluted a plasma sample into a saline sample by a factor of 10 (0.1ml of unknown plasma in 0.9 ml saline). We then found the amount of albumin in the plasma to be 0.079mg. Now I have to correct the ...
7
votes
1answer
222 views

Pauli exclusion principle

Pauli exclusion principle states that 'No two electron can exist in same state' or 'No two electron can have same set of quantum numbers'. But in reality there is no state of electron. The state is ...
22
votes
2answers
2k views

Is honey really a supersaturated solution? Does heating to un-crystalize redissolve it or melt it?

In the SciShow video Honey: Bacteria's Worst Enemy after about 00:30 the narrator says: Honey is only about 17% water. Most, but not all of what remains is sugar....
0
votes
1answer
181 views

Calculating Equilibrium Partial Pressures Given Kp and Mass

For the reaction $$\ce{AsCl5(g) <=> AsCl3(g) + Cl2(g)}$$ at $550$ K, the equilibrium constant ($K_p$) is $9.81$. Suppose that $3.150 \ g$ $\ce{AsCl5}$ is placed in an evacuated $600$ ml ...
-1
votes
0answers
10 views

calculating amount of oxygen in feed when there is excess oxygen

problem: In the Deacon process for the manufacture of chlorine, hydrochloric acid, $\text{HCl}$, and oxygen, $\text{O}_2$, react to form chlorine, $\text{Cl}_2$, and water, $\text{H}_2\text{O}$. ...
0
votes
0answers
28 views

Can entropy at absolute zero be positive? [closed]

This is a true or false question. Can entropy at absolute zero be positive?
-1
votes
0answers
31 views

Which enzyme activity is unlikely to be associated with mammalian cells? [closed]

Based on the following enzymes a, b and c, which one is unlikely to be found in a mamallian cell?
1
vote
1answer
13 views

Valence electrons in DNA nucleotide addition [on hold]

Can anyone explain the movement of valence electrons during the nucleophilic attack that occurs during DNA synthesis? The 3' oxygen starts with two lone pairs of electrons but what happens during the ...
0
votes
0answers
32 views

Does eating food with MSG make you thirsty? [closed]

My grandma alleges that she's thirsty after a meal that doesn't taste salty, if and only if the food contains MSG (monosodium glutamate). Is she correct? She doesn't believe the answers in this ...
0
votes
0answers
41 views

When is an organic phosphate acid and when is it not? [closed]

I would like to know when an organic phosphate is acid and when it is basic. I think I need the acidity constant given by the equilibrium equation in aqueous environment. I tried to find the ...
7
votes
2answers
88 views

Feasibility and Entropy

Suppose you've got some reaction that has a positive $\Delta H$, and also has positive $\Delta S_\mathrm{sys}$. Due to the equation $$\Delta S_\mathrm{tot} = \Delta S_\mathrm{sys} - \frac{\Delta H}{T}$...
1
vote
1answer
31 views

Spraying aluminium hydroxide nanoparticles onto PLA as fire retardant?

Several scientific papers study FR-PLA (fire resistant PLA) in which Aluminium Hydroxide nanoparticles are melt blended into the PLA (example source: Advances in Flame Retardant Poly(Lactic Acid). ...
6
votes
2answers
128 views

How can you use ICE tables to solve multiple coupled equilibria?

If I have a problem involving multiple coupled equilibrium reactions, such as Calcium fluoride, $\ce{CaF2}$, has a molar solubility of $\pu{2.1e−4 mol L−1}$ at pH = 7.00. By what factor does its ...
0
votes
1answer
66 views

Bromination of but-3-en-1-ol in basic medium and Baldwin's rules

After formation of the bromocarbocation the alkoxide anion attacks the bromocarbocation which leads to ring formation and can proceed through two pathways 5 endo tet cyclization is disfavored but 4 ...
0
votes
2answers
42 views

not understanding buffering region vs equivalence point [closed]

"During the titration of a weak polyprotic acid with a strong base, the first stoichiometric equivalence point occurs when the moles of added base are equal to the moles of the initial acid species. ...
-2
votes
0answers
20 views

Can a fully ionized nucleus participate in any sort of chemical reaction [closed]

If an element get fully ionized can it participate in any sort of chemical reaction?? Like H+ ion is also a bare nucleus and it react with other atoms normally. Can any other element's bare nucleus do ...
-2
votes
0answers
18 views

Is there any instance where the fajans rules fail or can't be applied? [closed]

.Is there any instance where the fajans rules fail or can't be applied? Like for any molecule?
-1
votes
1answer
30 views

What happen if KMnO4/H+ added to phenylethanoic acid oxidation? [closed]

What happen if KMnO4/H+ added to phenylethanoic acid oxidation?
0
votes
0answers
26 views

Can a carbon chain have an alkene/yne alkyl group? Name? [closed]

A side group of an alkane would be a alkyn, like methyl. But could you have a side group of an alkene or alkyne? methenyl? propynyl?
-2
votes
0answers
15 views

Correcting dilution factors [closed]

I diluted a plasma sample into a saline sample by a factor of 10 (0.1ml of unknown plasma in 0.9 ml saline). We then found the amount of albumin in the plasma to be 0.079mg. Now I have to correct the ...
-1
votes
0answers
14 views

chemical kinetics [closed]

Please answer the question with suitable explanation
-1
votes
1answer
29 views

Calculating the density of a gas using the ideal gas law [closed]

I am doing the following question: What is the density (in $\mathrm{g\ L^{-1}}$) of a gas with a molar mass of $60.0\ \mathrm{g\ mol^{-1}}$ at $0.75\ \mathrm{atm}$ and $27.0\ \mathrm{^\circ C}$? I ...
0
votes
1answer
39 views

diamine synthesis

I want to synthesize a new polyimide based on new diamine. In the first step of the synthesis of this diamine, my monomer was added to mixture of 1-chloro-4-nitrobenzene and potassium carbonate in ...
-1
votes
0answers
31 views

How can 2 gases with the same molecular structure have different specific heat capacities? [closed]

N2 and C02 are both linear molecules and as such should have the same number of degrees of freedom at room temperature. Why do they have different specific heat capacities? Is it simply because one is ...
-2
votes
2answers
34 views

Help required for the calculation of moles [closed]

If 4.5ml of yeast prep + 0.5ml of 0.25 M glucose is separated into 2ml in 2 similar flasks. How many micromoles of glucose are there in one flask? Using M1V1=M2V2 (0.5ml/1000)*0.25M = M2 * 2ml = 0....
0
votes
1answer
38 views

Potassium Manganate and Acidified Potassium Dichromate colour changes [closed]

I would be obliged if somebody could explain the colour changes for the reduction of potassium manganate and acidified potassium dichromate. I understand that for potassium manganate, it is being ...
-1
votes
2answers
31 views

How does acidifying a compound in qualitative analysis make sure any interrupting compounds get removed?

So I've learnt that acidifying a compound for salt analysis is to remove any basic interference and remove interrupting compounds such as carbonates. How does it remove them or what reaction is taking ...
0
votes
1answer
50 views

antisymmetric wavefunction [closed]

Why can't we choose any other antisymmetric function instead of a Slater determinant for a multi-electron system? Why do we choose our wavefunction for a multi-electron atom as a product of single-...
-1
votes
0answers
25 views

Thermal Decomposition of nitrates [closed]

I would like to see a visualisation of the thermal decomposition of nitrates. Something similar to this, from that I can understand a metal oxide and carbon dioxide would be formed, but for nitrates: ...
0
votes
0answers
27 views

Mechanisms of Penicillin V synthesis [closed]

I am an introductory organic chemistry student; I am looking at the total synthesis of Penicillin V via Sheehan's method. I'm struggling to figure out the mechanisms of each step; could anyone help ...
-1
votes
0answers
20 views

Enzyme Kinetics [closed]

An enzyme has an active site glutamate residue (pKa = 2.5), and the residue must be deprotonated for the enzyme to catalyze its reaction. How does the apparent V0 of this enzyme at a pH of 2.5 to ...
0
votes
1answer
68 views

if a balloon full of warm air was placed in a refrigerator, what is the result? [closed]

If a balloon full of warm air was placed in a refrigerator, What will happen to the Ballon ?
12
votes
5answers
602 views

Define, (actually define) the “stability” and “energy” of a compound

When we say a conformer or compound is of "higher energy" than another, are we quantifying energy in terms of the bond strength? Or are we going off of how much energy it takes to break the bond? I ...
0
votes
1answer
36 views

Endothermic and exothermic réactions (ice cube) [closed]

So I was studying chemistry and the topic was exo and endo reactions, and I've got a couple of questions, from what I understand, when a reaction is endothermic it absorbs all heat and makes the ...
0
votes
0answers
18 views

ML6 Type Coordinate Complexes - Drawing a Molecular Energy Orbital Diagram

In class we recently discussed how to draw out molecular orbital energy diagrams for compounds such as NH3 (ammonia). Building upon this, we touched on how to construct a molecular energy diagram for ...
-1
votes
0answers
28 views

What's the difference between CH3 and H3C? [duplicate]

Are there any difference? Why some write CH3 and some write H3C, I'm confused.
0
votes
0answers
15 views

Solutions when Electroplating

I'm essentially conducting an experiment to see whether using different copper-based compounds when electroplating copper onto an iron nail would give different results. So far, I've used copper ...
-1
votes
0answers
36 views

What rubber is safe to chew? [closed]

I am thinking to make some chew toys for my dogs. I was looking into some silicone rubber suppliers, but all of them replied they do not have FDA approved rubber so it will be safe if accidentally ...
-2
votes
0answers
26 views

How do you decide which half-equation to use? [closed]

In electrochemistry, half equations apparently do not have to be balanced when calculated E Standard Cell. But when a metal has several possible half equations, in different oxidation states, how do ...
-2
votes
0answers
35 views

Does anybody have any idea what this compound could be? [closed]

This is only part of the entire compound. I cannot interpret the rest of it. If anyone can tell what this compound is based off of this portion of the molecule, please let me know! Thank you! PS- the ...
0
votes
1answer
43 views

What happens when HCl is added to acetylene in presence of mercuric ions?

Normal addition of Hydrochloric Acid to acetylene would give me a 1,1 Dichloro product. But I read that in presence of mercuric ions only one molecule of HCl is added to give Vinyl Chloride. Why does ...

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