# All Questions

28,634 questions
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 ...
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, ...
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 ...
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 ...
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....
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 ...
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?
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 ...
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 ...
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 ...
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 ...
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....
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 ...
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, $\text{H}_2\text{O}$. ...
28 views

### Can entropy at absolute zero be positive? [closed]

This is a true or false question. Can entropy at absolute zero be positive?
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?
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 ...
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 ...
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 ...
88 views

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 ...
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 ...
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....
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 ...
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 ...
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-...
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: ...
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 ...
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 ...
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 ?
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 ...
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 ...
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 ...
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.
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 ...
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 ...
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 ...