# All Questions

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38 views

### Etching PCB - dealing with anhydrous ferric chloride

I'm looking into PCB etching,which requires ferric chloride (There are other etchants, but they're pretty hard to come by where I live and too expensive if I can find them). The issue is that where I ...
59 views

### When calculating the distance between molecules in a solution, is it reasonable to approximate a sphere around each molecule?

I am attempting to calculate the average distance between molecules in a particular concentration of a solution. My first instinct was to treat the solution as a system of spheres surrounding the ...
8 views

### Sp2d hybridisation [closed]

What's the deal with Cu(en)2++ since it's C.N. 4 and Cu stays as 3d9 in +2 state how is it sp2d and not sp3 infact, why does sp2d even exist, if a p orbital is already vacant for the ligand to use
37 views

### Why are some liquids hotter than room temperature gases if liquid and solid molecules move more slowly than gases? [closed]

We learned in school that state change is a matter of molecules moving faster and faster. And we learned "heat em up, speed em up, spread em out". Why then can some liquids have higher ...
29 views

### What happens if you use quaternary ammonium compounds to clean a cast iron weight plate and then rinse it out with water and soap afterwards?

I used a Clorox Disinfecting wipe to clean a dirty old iron plate I found in my garage. It got super sticky afterwards, so I went to rinse it off with soap and water before I wiped it dry. What ...
41 views

### Why is the aluminium boiling point higher than silicon? And why is silicon's melting point higher than aluminium?

Why is the Aluminium boiling point higher than silicon? And why is silicon's melting point higher than aluminium? $\ce{Si}$ has 4 bonds which are covalent in nature. $\ce{Al}$ is metal thus possesses ...
28 views

### Does mercury react with polycarbonate?

Looking around at various material compatibility charts, they seem quite divided on the compatibility of metallic mercury and polycarbonate. Some sources (here, here, or here) indicate that ...
35 views

### Questions About an Appropriate Textbook on Electrochemistry for Self-Study

Apologies if this is a somewhat frequent request (I promise I did scour various sources before posting, but none quite applied to me), but I was hoping for some insight from the community regarding an ...
36 views

### Why does electronegativity, a parameter defined using thermodynamic properties. measure a kinetic property?

Electronegativity is said to be tendency for an atom to attract electrons, hence we can think of it as related to kinetic properties. However the definition of electronegativity is given as:  | \...
85 views

### How does an MRI work? [closed]

This is my interpretation of an MRI: There's an external magnetic field and most of the hydrogen nuclei will align themselves with that field (which is the lower energy state) but some are not aligned ...
21 views

### Baeyer's test with potassium sorbate [closed]

what is the soulution of this reaction ? sodium (E,E)-hexa-2,4-dienoate +h2o + mno4- --->
34 views

### How does using a triode setup of an electron gun create a stable electron emission?

If a triode is an electronic amplifying vacuum tube how can this be combined with a electron gun to create a gun that produces a more stable electron emission? What is the set up when this is done? Is ...
9 views

### magnetically ordered compounds with magnetic moment on anions

The A15 structure of Cs$_{3}$C$_{60}$ seems to be one of the rare cases where a magnetically ordered compound has its magnetic moments on the anion: https://science.sciencemag.org/content/323/5921/...
19 views

### Analyzing alternating metals in a polymer matrix with 1 micrometer depth and only 10% metal

This is a theoretical question that I am struggling to get started on for a seminar discussion. If you were attempting to design an instrument with all the basic components (source, analyzer, detector,...
42 views

### Window glass to keep room cool

As i understand, A glass room gets hot as glass traps IR waves. IS it possible to create glass which let IR waves generated inside room and keep room temperature down? To make clear ,I am asking if ...
19 views

### Redox and anode/cathode in lead acid battery

I have watch a video about lead acid battery and I am very confused about the way the half reactions are labelled. I have learned that oxydation is the loss of electron (so it's the half reaction with ...
18 views

### What is the meaning of the slope in a graded dose-response curve?

A graded dose-response relationship is shown below with the drug concentration on the $\log$ scale on the $x$ axis and the response on the $y$ axis : According to this website: Slope: a useful ...
20 views

### Why do Backscattered electrons have higher resolution than secondary elections?

Is it because they are formed from smaller portions of the sample or is there some other reason?
15 views

### Understanding reciprocal lattice points

I am trying to make sure I have an accurate understanding of the effect of reciprocal lattice points on diffracting planes and the direction of the lattice point vector. Is the following statement ...
16 views

### Doubt regarding VBT and nature of NH3 as a ligand

Why is [Ni(NH3)6]++ outer orbital but [Co(NH3)6]+++ is not? Also some help on the order of the spectrochemical series would be really appreciated
49 views

### Must a desiccant be made anhydrous before it can be used for drying?

I'm writing about the treatment of methane gas, and in one part of the process, the methane gas is dried in a tank called a scrubber. Here, a desiccant called triethylene glycol is used. Thinking ...
24 views

### Reaction mechanism involving nitration and the addition of a base

I know the first reaction is likely a nitration with nitrite at the ortho position, but I can't figure out what comes next with the base.
12 views

### 1.000 g/L ammonia check from a 500 mL Kjeldahl digestion flask [closed]

1.000 g/L Ammonia check from a 500 mL Kjeldahl digestion flask. have tried NH4 CL dried 3.147g into 1 liter but was unsuccessful.
36 views

### Activation Energy and Equilibrium Position

Is the reaction direction with the lower activation energy favoured at equilibrium?
17 views

### What will a polyurethane resin not adhere to?

For making a mould out of the bicomponent polyurethane resin kit that I have - I am going to need to take out the mould from its form. The mould is what I am actually making from the bicomponent resin....
27 views

### How does solutions of two liquids work?

I'll start by establishing my potentially flawed understanding of solutions: A solution is a completely homogenous mixture. That means that the two (or more) substances are evenly distributed ...
59 views

### “Isotopes” in a molecule?

I just learned that atoms of the same element can have different mass because of they are isotopes. If there are two isotopes in which each reacts to form the same thing. Would the mass differ in each ...
35 views

### Reaction of Alkane RCOOH with KOH [closed]

The question is as follows: As much as 4.4 g of organic acid RCOOH is precisely neutralized by 200mL KOH 0.125 M.The molecular formula for the organic acid and the name of the acid compound with one ...
27 views

### Reaction of C4H10O with HI

I just finished my highschool chemistry test this morning, and I got a question which I can't seem to find the answer to. The question are as follows: Compound A ($\ce{C4H10O}$) does not react with ...
37 views

### Alternative explanation of ethene's pi bond

This tutorial about ethene's bonds has the following paragraph that I hope someone can paraphrase in a better way: The pi bond dominates the chemistry of ethene. It is very vulnerable to attack - a ...
26 views

### how to separate a mixture of sodium chloride and sodium hydroxide

I recently did an double displacement reaction in that I have formed a solution of water with sodium hydroxide and sodium chloride are dissolved in it. now I want to separate both of them
28 views

### Is the Hydrogen spectrum only an emission spectrum?

In a statement question it was stated that hydrogen spectrum is an emission spectrum and the scheme considered it to be ture. But my argument is that it can be both emission and abosorption spectrum. ...
27 views

### Activated carbon water interaction?

Does pouring water on hot carbon produce anything possibly? What i mean I tried to clean my activated carbon dont ask why, washed then put the liquid on oven then cool with water again. Is it possble ...
14 views

### Reaction of potassium sorbate with bayer's reagent [closed]

what is the solution of this reaction (Bayer's reagent) potassium sorbate + MnO4- + H2O = ?
11 views

### During electrolysis, will there be an uneven charge distribution in the electrolyte?

During the electrolysis of aqueous NaCl, the cations (Na+, H+) are atracted to the cathode and the anions (Cl-, OH-) are atracted to the anode. Is electricity here causing an uneven charge ...
14 views

### Calculate the final temperature and the work done by the oxygen that follows the Van Der Waals equation [closed]

A balloon is filled with oxygen at $25°C$ and $1.10$ $atm$. The atmospheric pressure is $640$ $torr$. The balloon explodes. Calculate the temperature of the oxygen immediately after exploding. If $Cv$ ...
45 views

### Still confused about thermodynamic processes

I'm trying to visualize a simultaneously adiabatic and isothermal process like large amounts of an ideal gas in a vacuum. As I understand, $\delta Q = 0$ in adiabatic processes, and $T$ is constant ...
31 views

### Choosing the correct formula for Helmholtz energy

Calculate Helmholtz energy $(ΔA)$ from the following processes. Consider that both processes are reversible and isothermal. a) The melting of $\pu{36.0 g}$ of ice, $\ce{H2O(s)},$ in liquid water \$\ce{...
38 views

### Does increasing the number of interferometers increase signal in FT-IR?

I'm trying to understand why most modern FT-IRs have three interferometers. Does this improve the signal in someway or does it have another effect?
15 views

### Deciding whether a precipitate would be soluble in water or not by calculation (problem solving)

This question is purely mathematical, I just could not understand how to approach it. (For reference the question mentions that compounds with solubility higher than 1 mol/L are soluble and insoluble ...
41 views

### What happens to Quats when they are spilled on the floor with bleach nearby?

I was cleaning up my room last night and used Swiffer Wet Sheets for the job. When I was storing the box back up on a cupboard, I accidentally let some of the liquid spill out onto the garage floor. ...
11 views

### N factor in redox reactions [closed]

What does n factor actually represent in redox reactions (Excluding acids and bases) Is it the gain in electrons or just the change in oxidation state
13 views

### Resources on the mechanism of Everhart-Thornley electron detector?

I'm trying to find some fundamental resources that explain the basic principals, components and applications of an Evenhart-Thornley Electron detector. It seems like there is limited "basic" ...
26 views

### Colligative properties: why does the size of solute not matter?

Colligative properties are defined as the "properties of solutions that depend on the ratio of the number of solute particles to the number of solvent molecules in a solution, and not on the ...
14 views

### Why doesn't the hydrated sulphuric acid react with the product or reactants in esterification?

I'm following this esterification tutorial. Why doesn't the hydrated sulphuric acid interfere with the reaction, (it just acts as a catalyst), given its acidity?
22 views

### Why doesn't separating the layers change the equilibrium point?

I'm following this tutorial for synthesizing esters. I don't understand why adding water to the separation funnel doesn't push the equilibrium reaction point back to the left, or why draining it doesn'...
12 views

### Prevention of sulphur oxidation [closed]

Assuming an unavoidable situation of an object being heated/burned that contains a lot sulfur, is there a chemical that could be applied that would specifically stop the sulfur oxidizing or at least ...
15 views

### How to calcualte the electrical potential of a mixture?

I have a mixture of 3 material: MgO2 (s) C 'carbon-nanotube" (s) polystyrene sulfonate (L) The material does not mix well, so I do not think any ion transfer happens. (Not an issue!) I want to ...