# All Questions

2 views

### What are the physical properties of tris(ethylenediamine)cobalt(III)?

I am aware of the (pictured) structure of Co(en)3, but what are the physical properties of this ion? Namely, what is its colour?
6 views

### Expansion of ideal gas in isothermic conditions

I'm doing this problem and I get a different value than the answer in a book. I'm not sure if the book is wrong or me. At a constant temperature of 298 K, calculate dS(sys) and dS(univ) for the free ...
6 views

### Calculating Valency Query

I understand that in $\ce{CuSO4}$ that $\ce{Cu} = +1$ in valency, that $\ce{S} = -2$, and that $\ce{O}4 = -6$, but I do not have an answer to check whether my answer of $-7$ as the overall valency is ...
12 views

### Explaining temperature change in an exothermic system.

In a neutralization reaction, is heat given out to the system, thereby raising its temperature? Suppose we put a thermometer in the acid-base mixture and there is an increase in the thermometer ...
10 views

### When is a reaction reversible?

When speaking in thermodynamic terms, when is a reaction reversible? My attempt: A reaction is reversible when $\Delta\text{S} < 0$, because according to the second law of thermodynamics, "in ...
10 views

### Stereochemical outcome after elimination followed by addition

"One of the following diastereomeric chlorides undergoes racemisation on heating whilst the other is returned unchanged. Explain." From the reaction conditions I can see that there must be an ...
8 views

### Is there relation between “Plane wave basis” “Correlation-Consistent” basis and “Fourier basis”

This question is related to the following link I found while browsing the internet: http://www.gutenberg.us/articles/Basis_set_(chemistry) The question: Is there a relation between "Plane wave basis" ...
10 views

### Effectiveness of getters to keep gasses sulphur free

My engineering task poses a problem with sulphur damaging electronic components. There are enclosed gas volumes which contain sensitive electronic devices as well as NBR sealings and gaskets. The ...
10 views

### Tables/database/literature of specific or optical rotation

I'm looking for a comprehensive reference of experimental specific rotation or optical rotation data. It can be a published literature review, a free web database with API access or one that permits ...
24 views

### Titration of NaOH with acetic acid

During a titration lab where 0.1 N of NaOH is added to 20 mL of acetic acid with the same concentration, the equivalence point occurred after adding about 70ish milliliters of NaOH (different peers ...
16 views

### Acids , Base and Neutralisation [on hold]

0.10 L of a 2.0 M solution of H2SO4 contains how many H that can be neutralized?
15 views

### How to decide rates of SN1 reactions

What will be the order of SN1 solvolysis rates for these? $\hspace{35 mm}$ I'm confused between the second and third options. $\ce{I-}$ is a better leaving group than $\ce{Br-}$, but the carbocation ...
88 views

32 views

### Cooling reaction alternative to ammonium nitrate and water?

We are a group of IT students developing an innovative cooling product. We have tried with an ammonium nitrate and water reaction to produce cold but the cooling power is not sufficient for our case. ...
30 views

### What in Peanut Butter dissolves glue?

There is a common belief that Peanut Butter can dissolve certain types of glue. I've tested it and it does on a few common stickers. A forensic science crime procedural TV show (Bones) made a ...
37 views

### Room-conditions supercritical fluids?

Are there any reasonably obtainable supercritical fluids that I could, say, run my hand through? Wikipedia makes it sound like there are plenty of room-temperature ones, but no room-pressure fluids.
57 views

### H2Te dipole and electronegativities of H and Te (high school level chemistry)

I saw somewhere that $\ce{H2Te}$ is a polar molecule, but as far as I know the only time dipole-dipole forces arise (giving molecules the possibility of becoming polar) are when there is a difference ...
24 views

### Alkenes express different reactivity with acids depending on concentration and temperature

The below images show when 1-butene reacts with different reagents (in d it's also H2SO4 not H2SO). My question is why are the two products different? I can get that in c), because it's more dilute ...
3 views

### Effects of long term mineral oil saturation acrylic monomer coating

I used a folded in-half band-aid (sticky sides inward) as a buffer between my finger and the textured touchpad on my laptop, but I also had to apply mineral oil or baby oil to the touchpad so that the ...
19 views

### Why do the melting points of Group 15 elements increase upto Arsenic but then decrease upto Bismuth?

The boiling points of group 15 elements increase on going down the group (or, as size increases) but the same is not true for the melting points. The melting points increase from $\ce{N}$ to $\ce{As}$ ...