If your question is part of your high school or college/university homework, please use this tag. It signifies that instead of a direct answer, care should be taken to explaining the steps to the solution, preferably sticking to just giving helpful, conceptual hints. This tag may be applied to ...

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-7
votes
0answers
22 views

Hydrochloric Acid & Sodium Hydroxide Neutralization [on hold]

I need help writing the introduction, hypothesis, prediction, results and conclusion.
4
votes
2answers
41 views

Calculating the number of ligands of complex ions in d- block

How do you know the number of ligands surrounding a metal ion? e.g. the obtained complex of $\ce{Ni^2+}$ ion in $\ce{NH3}$ solution is written as $\ce{[Ni(NH3)6]^2+}$ but $\ce{Cu^2+}$ in $\ce{NH3}$ ...
1
vote
1answer
31 views

Explain why these ions are more strongly hydrated in an aqueous solution?

Note-I've already answered this question. All I want to know is if my reasoning is correct. Case 1: Rb+ Na+ ----This ion is more strongly favored Case 2: Mg2+ ----This ion is more strongly ...
-1
votes
0answers
32 views

Entropy calculation (see description)

What is the entropy change when 1.00 mol of ideal gas that raises reversibly from 10 °C to 50 °C at constant pressure, constant volume, assuming the heat capacity is independent from temperature? ...
0
votes
0answers
18 views

How will liquid nitrogen behave in space? [on hold]

On earth, Nitrogen exists mainly as a gas. Under a lot of pressure but what about in space ? Will it behave just like that only or there will be any difference ?
-5
votes
1answer
30 views

How to compare acidic strength of following organic compounds? [duplicate]

Why Acetic acid is weaker acid than benzoic acid?
0
votes
0answers
14 views

How to find bond length when given dipole moment and percent ionic character? [on hold]

$\ce{HCl}$ molecules have a dipole moment of 1.08D. The percent ionic character is 20%. Given this information, how do I find bond length?
11
votes
5answers
448 views

Why does HCN boil at a higher temperature than NH3? [on hold]

The boiling point of ammonia is −33 °C while that of $\ce{HCN}$ is 25 °C. In a recent AP Chemistry test, a free response question asked why this is the case. Can someone shine light on this? Based on ...
-3
votes
0answers
18 views

Ksp and polarity of KH2PO4, and comparision of solubility with other compounds [on hold]

What is the $K_{sp}$ of $\ce{KH2PO4}$? And is it polar or non polar? Also, lets say we have solutions of 0.03M $\ce{KH2PO4}$, 0.02 M $\ce{NaCl}$, 0.01 M $\ce{NaCl}$ and 0.02 M $\ce{MgCl2}$. Which ...
2
votes
1answer
24 views

Determining the boiling point of a substance with the triple point and critical point

If I have the pressure and temperature of a substance in its triple point, as well as its pressure and temperature in the critical point, how can I determine de boiling point of the substance at 1 atm ...
3
votes
1answer
50 views

Solute mole fraction for hydrated magnesium sulfate dissolved in water

Problem: 70 grams of pure, hydrated $\ce{MgSO_4}$ is dissolved in 90 grams of $\ce{H_2O}$. If the mole fraction of the solute is 0.039, find the molecular formula of the solute. My flawed ...
-4
votes
0answers
67 views

coordination chemistry and werners theory of complex compounds [on hold]

A solution containing 2.674 g of $\ce{CoCl3*6NH3}$ was passed through the cation exchanger. The eluted solution yields 4.305 g precipitate of $\ce{AgCl}$ with an $\ce{AgNO3}$solution. ...
3
votes
1answer
46 views

Calculating edge length of a cube atom

This question comes straight from a worksheet we were assigned in chemistry, though it’s more math focused of a question I hope that this is an appropriate question to ask here. Calculate the edge ...
7
votes
1answer
43 views

What is the bonding type in hydrides of group 2 elements?

In one of my MCQ questions, there was a statement saying all group 2 elements form covalent hydroxides. I know it is incorrect. I know that $\ce{BeH2}$ is a covalent hydride. What about the rest? Are ...
6
votes
0answers
40 views

Adding a polyvinyl alcohol chain onto polyethylene

For school, my teacher asked what the proper procedure/reaction would be to add a polyvinyl alcohol chain onto a polyethylene chain. Can anyone help? I'll provide additional information if needed.
-3
votes
0answers
30 views

Finding Moles of CO2 using stoichiometry [on hold]

If solving for moles of co2 using PV=nRT for n, what method would be used to find the moles produced in the ideal reaction (to compare to measured vs ideal and get percent error) Ive tried using ...
-4
votes
0answers
39 views

what is the equilibrium concentration of A? [on hold]

Solutions of A and B are mixed and brought to equilibrium. The starting concentrations of A and B are 0.80 mol/L, each. C and D are produced according to the following equation. $$\ce{A(aq) + ...
-3
votes
1answer
46 views

How to decide whether complex will be octahedral or tetrahedral? [on hold]

$\ce{Ni^{+2}}$ with $\ce{Cl-}$ is tetrahedral but with $\ce{H2O}$ the complex formed is octahedral, why?
-2
votes
1answer
59 views

How to calculate the mass of phosgene in the equilibrium mixture of carbon dioxide and dichloride? [on hold]

I'm stuck on the last question of my homework and I really need some help! How much $\ce{COCl2}$ grams is in the equilibrium mixture? Consider the reaction: $$\ce{CO(g) + Cl2(g) <=> ...
-6
votes
0answers
27 views

What is the outcome of 2-chloro-2-methylpropane reacting with NaOH? [closed]

I need a detailed explanation of the reaction mechanics and what could be other outcomes.
4
votes
1answer
49 views

Struggling With NMR Determination Question

I am currently struggling with an assignment question regarding structural determination using both $\ce{^1H}$ and $\ce{^{13}C}$ NMR data. The first thing I have done is calculate my double bond ...
6
votes
2answers
392 views

Carbon Dating: What to compare the new value against?

Formula for calculating age by using carbon-14 (source: HowStuffWorks) $$ t = \frac{\ln (N_f/N_o)}{-0.693}t_{1/2} $$ The page doesn't explain what the $-0.693$ represents. What is $-0.693$? Secondly, ...
6
votes
2answers
113 views

Is there any other way of solving this problem than trial and error

I have a wave number question which I have partially solved The question is:- What transition in He+ ion shall have the same wavenumber as the first line in Balmer series of H atom? (a) 7->5 (b) ...
3
votes
0answers
26 views

Choosing the instrumental techniques for chemical analysis [closed]

Since every technique has its goods and its bads characteristics, it's a bit hard for me to choose between them to determine specific elements, methods such as UV-VIS spectroscopy, IR spectroscopy, ...
-5
votes
0answers
26 views

Chemical reactions between metals and acids and bases [closed]

How do the following reactions physically appear: $\ce{Fe}$ with $\ce{H2SO4}$ $\ce{Al}$ with $\ce{NaOH}$
-2
votes
1answer
44 views

Kinetic Molecular Theory, Ideal Gas, and Relationship Between Pressure, Temp., and Volume [closed]

Using the Kinetic Molecular Theory, describe an ideal gas and the relationship between pressure, temperature and volume. Explain why there are no truly ideal gases in nature.
5
votes
0answers
56 views

What will be the final product of this reaction?

ATTEMPT: The first step will be the attack of $\ce{PhMgX}$ on carbonyl carbon, that is, 1,2 position followed by hydrolysis, yielding an alcohol. But how does the reaction proceed with ...
-5
votes
0answers
39 views

Balance chemical equation [closed]

When $\ce{LiOH}$ pellets are added to a solution of $\ce{H2SO4}$, $\ce{LiSO4}$ and $\ce{H2O}$ are formed. How would I balance the equation?
-3
votes
0answers
18 views

Stoichiometry of the combustion of butane [closed]

Lighters often use butane ($\ce{C4H10}$) as fuel. If the lighter needs oxygen to burn, and gives off carbon dioxide and water vapor, how many molecules of $\ce{O2}$ are required to burn two ...
3
votes
2answers
44 views

Heating of Ethers with HI and Cleavage of Ethers

Here is a question from my textbook:- Q - Give the major product formed by the heating of the following ether with HI. ...
2
votes
0answers
35 views

Carbonyl group Conjugation and IR spectroscopy

Here's the problem... Three isomeric structures with formula $\ce{C10H8O2}$ are shown: I understand that conjugation in the systems will affect the carbonyl stretching ...
2
votes
1answer
26 views

Calculating the number of molecules remaining

This is the question in my text book: From $392\:\mathrm{mg}$ of $\ce{H2SO4}$, $1.204 \times 10^{21}$ molecules are removed. How many moles of $\ce{H2SO4}$ are left? What I tried doing: First I ...
4
votes
1answer
44 views

Disproportionation with aqueous NaOH

Which of the following undergoes disproportionation with $\ce{NaOH}$? $\ce{SiO2}$ $\ce{CO2}$ $\ce{SO2}$ $\ce{SO3}$ $\ce{NO2}$ From the above we can conclude that $\ce{SiO2}$, $\ce{CO2}$ and ...
-4
votes
0answers
127 views

How to balance the redox reaction between ascorbic acid and hexacyanoferrate (III)? [closed]

Balance the following redox reaction. $$\ce{[Fe(CN)6]^3- + ascorbic\ acid -> [Fe(CN)6]^4- + dehydroascorbic\ acid + H+}$$ Can someone please help identify the balanced equation to this redox ...
11
votes
2answers
105 views

Does a Grignard reagent react with cyclohex-2-en-1-one to give the 1,2- or 1,4- product?

My attempt: The $\ce{PhMgBr}$ nucleophile attacks on the 1,2 position. But why, in this case, will it attack the 1,4 position?
-4
votes
0answers
25 views

Rate the following ions by their stability [closed]

Rate the following ions by their stability: ($\ce{N2}$)+ ($\ce{NO}$)+ ($\ce{CN}$)+ ($\ce{He2}$)+ ($\ce{Cl2}$)+ Can you provide with molecular orbital diagrams for the above ions as well?
-5
votes
0answers
18 views

Stoichiometry - Neutralization Reaction [closed]

10 grams mixture of calcium carbonate and magnesium carbonate is reacted with hydrochloric acid requiring 1 liter of 0.218 molar acid solution. The resulting solution is diluted to 2 liters. Now, ...
0
votes
1answer
43 views

Percentage purity of H2O2 after reaction [closed]

$10\:\mathrm{cm^3}\:\ce{H2O2}$ solution when reacted with $\ce{KI}$ solution produced $0.5\:\mathrm{g}$ of $\ce{I2}$. What is the percentage purity of $\ce{H2O2}$? Firstly, I don't understand the ...
-2
votes
1answer
46 views

Determine atomic mass from isotope abundance [duplicate]

Recently in school, the chapter on Moles started and we were given few questions to solve. Out of those questions, I'm not able to understand that how do I solve this one - ...
4
votes
1answer
120 views

Is the largest number of molecules in 36 g of water or 54 g of dinitrogen pentaoxide?

So recently my teacher asked us which of the following has the largest number of molecules? He gave us two options: 36g of $\ce{H2O}$ 54g of $\ce{N2O5}$ I'm stuck, because both of them are ...
1
vote
1answer
69 views

What comes after the f orbital? and calculations [duplicate]

What is after the $f$ orbital? as my physical chemistry textbook does not say anything in it and how do they fill etc?
0
votes
1answer
34 views

Finding 1/V from absorbance in Lineweaver-burk plot

I’ve got six test-tubes with $0.5\ \mathrm{ml}+0.5\ \mathrm{ml}$ of 0.005 %, 0.0025 %, 0.00125 %, 0.000625 %, 0.0003125 % and 0.0003125 % starch and 4.2 pH phosphate buffer solution (2, 4, 8, 16, and ...
8
votes
3answers
262 views

Differentiation between Zn(2+), Al(3+), Mg(2+) in solution

If I have three aqueous ionic solutions in which I know that the cation is $\ce{Al^3+}$, $\ce{Mg^2+}$, or $\ce{Zn^2+}$, and that how do I find out which is which? I was thinking to add $\ce{OH-}$ in ...
1
vote
1answer
56 views

What number should go underneath this fictitious element on the periodic table? [closed]

A new element (Wickium) was discovered on Mars. The isotopes of Wickium are Wickium-199, Wickium-200, and Wickium 201. The percent abundance of Wickium's isotopes are as follows: $$\ce{^199Wi} = ...
2
votes
1answer
37 views

Is solubility in Qsp affected by coefficient?

Related to my previous question: Is solubility coefficient affected if ion data is given in Ksp? $200\,\mathrm{mL}$ solution of $0.02\,\mathrm{M}\,\ce{AgNO3}$ is added to $200\,\mathrm{mL}$ ...
3
votes
1answer
50 views

Neutralisation and end point pH

So I just finished my final paper yesterday and I tried to attempt this 8 mark question. I am not sure how to do it. $25\,\mathrm{ml}$ of $0.5\,\%~\mathrm{w/v}$ lactic acid ($\ce{C3H6O3}$, ...
-3
votes
1answer
38 views

Is the following reaction redox? [closed]

Is the test of sulphur using sodium nitroprusside a redox reaction?
9
votes
2answers
94 views

What is formed when you leave iron (II) sulfate in plain air?

What is formed when you leave iron (II) sulfate in plain air? It was the question I found in textbook. Assuming that air is oxygen I solved it this way: $$\ce{FeSO4 + O2 -> Fe2O3 + SO2}$$ ...
2
votes
1answer
33 views

Hess' Law contact process question

In the contact process, the commercial process of producing $\ce{H2SO4}$, several reactions occur before the final product is produced: $\ce{S8_{(s)} +8O2_{(g)} -> 8SO2_{(g)}}~~~~~~~~~~\Delta ...
4
votes
1answer
39 views

Expansion of a gas, calculating new volume

Hi I was reading this while studying for an exam and wondered how you would go about calculating it, I’m a bit confused. $\mathrm{5~mol}$ of a gas is confined in a piston (volume $\mathrm{100~cm^3}$) ...