# All Questions

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### If Benzene Is Put In Water [on hold]

How does $\ce{C6H6}$ dissociate in water? I started to read how inorganic acid dissociates in water.And stood against the above question.
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### Which one is dilute:1) 2M of 250cm3 or 2) 5M of 500cm3 [on hold]

Molarity of a solution .titration. Dilution method.of solution .
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### Precautions and tips for Qualitative Inorganic Analysis of Coins

I'm a highschool student and as part of an investigatory project, I have decided to analyse which metals are present in our everyday coins. I chose this because in my previous academic year, I had ...
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### magnetism in metallic alloys

i am working with a multicomponent alloy system for soft magnetic application,it is iron based and have composition of Fe Mn Si B Mo,how can i calculate the net magnetic moment or saturation ...
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### i am trying to calculate a sum in dilutions [on hold]

0.25g of sodium chloride diluted to 100ml i have tried doing it this way but i'm unsure my answer is correct ...
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### What is the pressure (in atmospheres) of the gas inside a container connected to an open-end, mercury-filled manometer? [on hold]

What is the pressure (in atmospheres) of the gas inside a container connected to an open-end, mercury-filled manometer? The atmospheric pressure is 0.95 atm. My answer was 0.24 How was 1.19 atm the ...
1k views

37 views

### Element letters

Does it change the compound if the element letters are switched? ex. HO or OH. Are those two different compounds or are they one in the same? This may be a simple question or I may have incorrectly ...
25 views

### Metal-Ligand-Complex and bond directions: What defines coordinate system of the complex ion? [duplicate]

I have a question concerning metal ligand complexes. In every chemistry text book I have read which treats metal ligand complexes, following situation is discussed: When 6 ligands (in octahedral ...
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### pH Indicators for Hoffman apparatus

I've read that bromothymol blue can be mixed in with the electrolyte in the demonstration of electrolysis using a Hoffman apparatus. The indicator clearly shows the local differences in pH for the ...
40 views

### Caclulating the Solubility of Fluorite in River Water

I am attempting to work through problems in Chapter 4 of Brunlow's 1979 Geochemistry text. The question is "Calculate the solubility of fluorite in river water with the average composition given in ...
53 views

### How to draw glucose using a Fischer projection?

I asked how to draw glucose as a Fischer projection from its given chair conformation but all I got was an unsatisfactory ad hoc explanation involving rotation of my neck muscles to somehow see where ...
18 views

### density of potassium bromide

I'd like to know the density and viscosity of aqueous KBr at varying concentrations and at varying temperatures. I was able to find this data at 20 degrees C in the CRC Handbook for Chemistry and ...
2k views

### Why are the rare earths erbium (Er), terbium (Tb), yttrium (Y) and ytterbium (Yb) named like that?

I know the history of the discovery of the rare earth elements, that they were discovered near the village Ytterby in Sweden in the 19th century. Four elements are directly named after that village: ...
34 views

### Ultraviolet acid base indicator

Is there a chemical(s) that provides good discrimination between absorbance curves for different pHs in the UV light spectrum (100-400nm?)
177 views

### Concept of “non-superimposable mirror image” in chirality

I didn't understand the fact that chiral objects are non-superimposable on their mirror images. I mean, if you put your right hand (apparently an achiral object) in front of a mirror, the mirror image ...
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Apparently carboxylic acid derivatives such as cyanohydrins can be taken back to "daddy" - a carboxylic acid - under the right conditions. This involves acid, water, and "high heat." What, however, is ...
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### question regarding what i can put in category of homework questions [migrated]

I just wanted to know that if I am unable to solve a particular question that is completely unable even to start up with the question and i put it on this site without showing any effort because i ...
28 views

### Titration and calculation of the number of moles after a mix

I have the following problem on an assignment that I don't understand. Given the following balanced equation for the titration of HCl with NaOH: $\ce{HCl + NaOH -> NaCl + H2O}$ The initial ...
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### How to plot standard curve using D-Galactouronic acid

I wanted to calculate the Pectinase enzyme activity. so how can I plot standard curve using D-galactouronic acid ? also is it possible using glucose ?
43 views

### Convert Hexane to 1,6-Dibromohexane

Is it possible by any means or by using some reagents to convert Hexane to 1,6-Dibromohexane Hexane: 1,6-Dibromehexane: The yield should also be good
32 views

### How to clean wall painted with water-proof paint tainted with cigarette smoke [on hold]

This article mention The Lingering Effects of Secondhand Smoke Once you put out that last cigarette, the harmful toxins can remain in your home for much longer than you might expect. According to ...
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### What is the entropy of mixing of two ideal gases starting out with different pressures?

The entropy of mixing of ideal gas is given by this equation: $\Delta S_{mix} = -nR(x_1\ln x_1 + x_2\ln x_2)$ Does this equation works only when the initial conditions of both compartments are at ...
22 views

### Thermochemistry - energy [on hold]

Calculate the change in internal energy for the following reaction at 1.00 atm and 25 C: 2 CO(g) + O2(g) = 2CO2(g) deltaH= -566.0 KJ?
19 views

### Relationship between Auto-Ignition Temperature with Pressure and Fuel

Experimentally it appears that increase in pressure, fuel concentration, and chain length causes AIT to decrease until a minimum where even further increase in these parameters increases the AIT. ...
345 views

### Interpreting a Formula Tattoo (Bipolar?)

Found This Online. Something to do with bipolar disorder?
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### How much oxygen and carbon must be combined to create exactly 100.0 g of CO2 without any leftover? [on hold]

I'm completely stumped on this one. Everything needed for the question is in the title. I know that 20.0 g of carbon and 32.0 g of oxygen make 44.0 g of $\mathrm{CO_2}$ with 8.0 carbon leftover.
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### Anti hydrogenation of alkynes-Purpose of NH4Cl

In my orgo textbook, Lithium is used to create a free radical of the alkynes, to then allow the anti addition of hydrogen to get an alkene. "The Dissolving Metal Reduction of Alkynes" is a reaction ...
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### Find new energy level of H atom absorbing a photon

The problem I'm on says a ground state H atom absorbs a photon of 97.20nm, what energy level does it jump to. So n would start at 1. I don't have an equation specifically for a change in n though. I ...
19 views

### Finding mass equivalence of a photon

The problem has a flame emitting a wavelength of 589nm, and asks for the mass of one photon of that wavelength. I tells me that 1 J = 1 kgm^2/s^2. I converted to J using E=(hc)/wavelength. I'm not ...
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### How to assign the signals in the H-NMR of Aspirin?

I need to assign the H-NMR of aspirin, below is aspirin with the H's labelled. The peaks I have are: 2.30ppm (I this is a singlet and would be F) 7.07ppm (I think this is E) 7.29ppm ...
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### What's the electronic configuration of Nickel and Oxygen in RNiO3 (R=Rare-Earth)?

Nickel's electronic ground state is $\mathrm{3d^8 4s^2}$ (there's a dispute on this, but let's not worry about it for now). Oxygen's is $\mathrm{2s^2 2p^4}$. In a Rare-Earth based Nickelate with ...