0
votes
2answers
10 views

The relationships between n , T , P , V for a gas?

The symbols : T : temperature // V : volume // P : pressure // n : number of mole what it is clearly known about the relationship between one another is : P is inversely proportional to V ( from ...
4
votes
1answer
32 views

Rationalising the order of reactivity of carbonyl compounds towards nucleophiles

This is immediately following ron's answer from Why is a ketone more nucleophilic than an ester? One of the most simplest questions you can ask, how can you rationalise the order of reactivity ...
2
votes
1answer
22 views

How to obtain product ratio from energy differences via Boltzmann statistics

I am currently calculating some reactions and I would like to express the ratio of the products in per cents. I am using the Boltzmann statistic in the following way: The probability $p_j$ of a ...
2
votes
1answer
21 views

Electrochemistry question about equilibrium in half cell reaction

Given the following half-reactions: $\ce{Ce^{4+} + e− -> Ce^{3+}}$ E° = 1.72 V $\ce{ Fe^{3+} + e− -> Fe^{2+}}$ E° = 0.771 V A solution is prepared by mixing ...
0
votes
1answer
30 views

What is the chemistry of this household cleaning recipe?

What would be the product if baking soda and common salt and vinegar are added together?
0
votes
0answers
18 views

Find the pH change [on hold]

Assuming a negligible change in volume, how many moles of either OH- or H+ would have to be added to change the pH of 1.00 L of a solution from 4.35 to 5.85? P.S. I have learnt $$pKw = pH + pOH ...
0
votes
0answers
17 views

How would those combustions range in term of “toxicity”? wood burning, insect burning, smoldering tobacco cigarette

I'd like to identify what makes a fume more or less toxic, above all those from commonly smoked organic stuff: tobacco, cannabis. For that, that would be a good idea I think, to compare the gaseous ...
0
votes
0answers
21 views

What is the white crystalline precipitate obtained when magnesium ions react with ammonium biphosphate in the presence of ammonium hydroxide? [on hold]

What is the white crystalline precipitate obtained when magnesium ions react with ammonium biphosphate in the presence of ammonium hydroxide? Please give the formula as soon as possible.
2
votes
2answers
24 views

Find the color of the solution

The acid-base indicator methyl red has a $K_{a}$ = $1 \times 10^{-5}$. Its acidic form is red while its alkaline form is yellow. If methyl red is added in a colorless solution with a $pH = 7$, the ...
0
votes
1answer
14 views

…to occupy a volume of 16.2 L when measured at 675.9 mmHg and 43.4oC. What is the partial pressure of oxygen in this mixture?

the problem says : A 19.3-g mixture of oxygen and argon is found to occupy a volume of 16.2 L when measured at 675.9 mmHg and 43.4oC. What is the partial pressure of oxygen in this mixture? the ...
1
vote
3answers
44 views

How to predict the products of a organic chemical reaction [on hold]

I want to know how to predict the products of a organic chemical reaction, when the reactants are given. What aspects should I consider when predicting the products ?
1
vote
0answers
16 views

Atomic radii of Sc,Ti and Fe,Co

The atomic radii of Sc is 162pm , Ti is 147pm , Fe is 126pm and that of Co is 125pm. Electronic configuration of Fe is (Ar)3d6 4s2 and that of Co is (Ar) 3d7 4s2. Difference of Z between them is 1 ...
0
votes
1answer
22 views

Equilibrium Graphs

What if I2 and H2 began at the same concentration - then do we start at the same point? ... or is it acceptable to start at different concentrations...
0
votes
1answer
18 views

Equilibrium Practical Discussion Help

I understand the theory, but am struggling to answer the following discussion questions: (i) Why isn't this represented by: Fe3+ (aq) + 3 SCN- (aq) <-> Fe(SCN)3 (aq) Why do we dilute the ...
2
votes
2answers
215 views

Is “Propanol” correct name according to the latest IUPAC nomenclature?

My teacher said that Propan-1-ol can also be written as Propanol in latest IUPAC nomenclature. I doubt this because wikipedea mentions only Propan-1-ol in IUPAC naming and Propanol in other names. ...
1
vote
0answers
14 views

Analytic Chemistry question [on hold]

On being heated in oxygen 5.72 grams of red metal oxide 'A' was converted to 6.36 grams of black metal oxide 'B'. When 4.77 grams of 'B' was heated in a stream of H2(dihydrogen), 3.81 grams of metal ...
2
votes
1answer
15 views

A 1.00 L gas at 100. °C and 500. torr contains 70.0 % He and 30.0 % Ne by mass. What is the partial pressure of He?

A $1.00~\mathrm{L}$ gas at $100~^\circ\mathrm{C}$ and $500~\mathrm{torr}$ contains $70.0\%~\ce{He}$ and $30.0\%~\ce{Ne}$ by mass. What is the partial pressure of $\ce{He}$? My answer is ...
4
votes
3answers
83 views

Do filled Orbitals also hybridize?

Recently I was watching a video on Valence Bond Theory, on the MIT Open-Course youtube channel. The teacher there said that for hybridization to occur, electron promotion from fully filled orbitals to ...
2
votes
0answers
18 views

When is it true that more nodes equals higher energy?

Consider all the MOs of some isolated molecule. (It could be a single atom too; I'll use MO to refer to AOs as well.) Number them in increasing order of the number of nodes (node = surface where the ...
1
vote
1answer
10 views

Are salt substitutes good alternatives to sodium chloride?

I bought a low salt Ketchup from Heinz and it says it uses 'ALSOSALT' substitute ( potassium chloride). It says it does have 5mg. of sodium. Is potassium chloride (with possible additives) a good ...
2
votes
1answer
26 views

What makes a ligand stronger than another?

A ligand is a neutral molecule or negative ion with at least one lone pair of electrons which forms a dative covalent bond with a complex ion that has a vacant, energetically accessible orbital. It ...
1
vote
0answers
19 views

How do I measure the density of a cellulose acetate membrane?

I've been playing around with filtration methods, and got my hands on a casting machine for this purpose. My first mission was to find out how porosity can affect filtration. To see this for myself, ...
2
votes
3answers
30 views

What does the hydrolysis of a salt tell us about its basic/acidic character?

I'm curious to know how basicity and acidity arises when a salt or covalent compound is dissolved in water.
2
votes
2answers
51 views

Why do other sugars melt whereas sucrose decomposes?

Sucrose decomposes at 186°C. It doesn't melt but when it reaches decomposition temperature, sucrose decomposes into fructose and glucose. After cooling and hardening it is no longer sucrose. Am I ...
-2
votes
0answers
19 views

states of matter [on hold]

a vertical hollow cylinder of height 152 cm is fitted with the weightless piston. the lower half is filled with an ideal and upper half with mercury. the cylinder is now heated at 300K so that 1/4th ...
4
votes
0answers
50 views

What stable arrangements of hydrogen-bonded water exist in the range of 4-20 water molecules?

Water clusters made up of various numbers of water molecules have been described. Are all of these structures theoretical? What experimental evidence supports any of these structures? How does the ...
2
votes
0answers
19 views

On spontaneity of a redox reaction

Suppose we have a redox reaction and we want to see in what direction the reaction is spontaneous. We do this by comparing the standard reduction potentials of the sub-reactions available in the main ...
2
votes
1answer
61 views

Confused on Amphiprotic vs Polyprotic

I have several questions relating to amphiprotic vs polyprotic substances. First, I have read that $\ce{H2AsO4-}$ is a amphiprotic substances in that the dominant reactivity is $$\ce{2H2AsO4- ...
5
votes
1answer
50 views

Is it possible to remove salt from food without changing the flavor?

I love soup, even a thick soup for dinner, yet many soup products have 400 to 1000 mg of sodium in them. Is there a simple chemical procedure any consumer could do to take the sodium out of the ...
4
votes
1answer
60 views

Why Aren't Chlorides Of The Noble Gases As Prevalent As Their Fluorides?

I can't find the answer to this question on this SE website, and I apologize for the repetition if it has been answered before. It is my understanding that compound formation has only been observed ...
1
vote
1answer
58 views

How could household vinegar create a salt on car carpet?

I am not a chemist! My chemistry classes from my molecular biology undergrad are far behind me. But I think I created a salt, and I don't know how. Here is my mystery: I recently got some water in my ...
2
votes
1answer
27 views

Carbonyl/Nitrosonium Complex Stability

Why is the nickel complex exhibiting the strongest pi-bonding? From what I understand, charge density plays a role. Also we need some empty orbitals on the metal cation, since we're looking at ...
0
votes
0answers
23 views

Removing the hydrazine byproduct from the mitsunobu reaction

Looking to remove the hydrazine byproduct left after the mitsunobu reaction. Using DIAD and polymer bound triphenyl phosphine. The reduced diad is coeluting with my product on silica. My thoughts for ...
1
vote
1answer
27 views

Explanation for increase in the number of oxidation states for transition elements from Sc to Mn of the 4th period

From Sc, to Mn, the number of oxidation states increases from one (Sc) to seven (Mn). The explanation for this is because the unpaired 3d electrons can be lost along with the 4s electrons during ...
2
votes
1answer
45 views

What do the half-reactions need to be for balancing a redox reaction in an acidic medium?

Question: Balance the following reaction: $\ce{CuS + SO4^{2-} -> CuO + SO2}$ My Efforts: Number mentioned in the brackets oxidation number of S I have found out that the oxidation ...
2
votes
4answers
96 views

What is the proper Lewis structure for HCOOH?

I tried to draw the Lewis structure of $\ce{HCOOH}$ but I didn't get the correct representation. As you can see in the picture below, at no. 1, I put $\ce{C}$ as the central atom because it has less ...
-1
votes
0answers
30 views

How to crystallize out reaction mixture from DMF?

Reaction was carried out in DMF, and TLC shows that the reaction has completed. But how to separate reaction mixture i.e. product from DMF?
5
votes
2answers
72 views

Counting Nodal Planes in cyclopropane

The energy of molecule orbitals increases with more nodal planes. W1 (in the attached picture) has no nodal plane. I'd like to know how to draw the nodal planes in cyclopropane molecule orbitals but ...
5
votes
2answers
44 views

Does vinegar neutralize the strongly basic compounds in cement?

I have heard that washing one's hands with vinegar is effective in neutralizing the strong bases in cement and is more effective than water. I want to know how cement burns and what bases are ...
1
vote
1answer
116 views

Kinetic and Thermodynamic Stability

My prof noted that if the two components of any ionic compound undergo a large extent reaction with each other, then the substance CANNOT exist as a pure substance. For example, consider ammonium ...
0
votes
1answer
33 views

Electrochemical Cell Polarity

In an electrochemical cell, the anode undergoes oxidation and the cathode undergoes reduction. This means that the anode loses electrons while the cathode gains electrons. However, the anode is ...
2
votes
0answers
21 views

How to test for presence of Tobacco/nicotine in a product?

I found this paper that says nicotine was found in major toothpaste brands in India. Rather than playing blame game, wouldn't it be easier to test ourselves ? How to test for presence of ...
0
votes
0answers
6 views

Height of potential barrier

Could anyone please help to find the height of potential barrier between silver and copper or cu-cu. I am working on a piezo- resistive sensor based on copper fabric and silver electrodes. I was ...
0
votes
2answers
34 views

What happens when we heat an atom?

Question is simple.. If we take an atom of any element and then supply heat energy to it then what will happen? Acc to me in beginning energy[quanta(due to excitement of electron and then moving ...
2
votes
1answer
14 views

High/low density water solution values

I would like to know what min and max values of densities are achievable with water solutions. There are some conditions: 1. Normal or close to normal temperature; 2. Non-radioactive ...
4
votes
0answers
33 views

Why do different alcohols have different effects on the brain?

I've been trying to understand why different alcohols have different effects on the brain. Methanol is obviously poisonous, apparently because it's converted to formic acid. Because the body seems ...
4
votes
2answers
328 views

Shape Of Cetyl Alcohol

Why is cetyl alcohol bent at the 9th position?
1
vote
1answer
59 views

What Quantum Chemistry Model Should I Use?

Sorry for such a elementary question, My Main purpose is using Quantum Chemistry for simulation of some reactions. Actually we are working on making some new polymers and I need to simulate some ...
1
vote
0answers
29 views

Low Melting Glass

What kind of glass can I purchase that will melt in a Bunsen burner flame? Follow up question: Is there any way to treat glass such that the melting point is lowered? I tried adding some sodium ...
4
votes
2answers
54 views
+50

Safety when handling cyclohexylamine in non-industrial amounts

Today I was pipetting some cyclohexylamine into smaller bottles so that I don't have to use the liter flask every time I need a little bit of catalyst or plasticizer. I pipetted several 10-20 mL ...

15 30 50 per page