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1answer
19 views

Do IUPAC names for haloalkanes require numerals?

I'm new one of chemistry. I want to know the IUPAC nomenclature rules. That is if we write alkane with halogen must be indicate the numerals? Are the following names right or wrong? chloropentane ...
-2
votes
0answers
8 views

Hardness of water using EDTA [on hold]

250 ml of a sample of water on EDTA titration with Erio-T as indicator consumed 13 ml of 0.022 M EDTA till end point is reached. Calculate the hardness of water (Imi of 0.01 M EDTA = 1 mg of CaCO3.
1
vote
1answer
28 views

Comparison of enol content

How can we find the order of percentage of enol form of the compounds in the following equilibria? Percentage of enol form in x is highest as due to aromaticity. But how can we compare that for y and ...
-1
votes
0answers
27 views

Freezing point depression

Three aqueous solutions are made, $\ce{FeCl2}$, $\ce{NaCl}$ and $\ce{Na2S}$ all of which have the same molarity. Which two solutions will have the same freezing point depression? a. $\ce{FeCl2}$ and ...
4
votes
0answers
39 views

Bromination of Benzene Based Molecule

Using two equivalents of $\ce{Br2}$ and catalytic $\ce{FeBr3}$ compound A can be converted into B. In the same reaction vessel but in multiple steps the conversion of B into C ($\ce{C11H12Br3I}$) ...
-1
votes
0answers
17 views

Boiling point of benzene solution [on hold]

Pure benzene boils at 80.1 ˚C and has a Kb of 2.53 ˚C/m. If 112.0 g of CCl4 are dissolved in 850.0 g of benzene, what will the new boiling point of the solution be?
4
votes
1answer
41 views

Mechanism of substitution reaction with no change in stereochemistry

When ($2$S,$3$R)-$3$-iodobutan-$2$-ol undergoes a substitution reaction with sodium azide the only organic product from the reaction is ($2$S,$3$R)-$3$-azidobutan-$2$-ol. Give a mechanism for the ...
-7
votes
1answer
35 views

Cooling of solution [on hold]

The tea with sugar added in the first problem begins to cool. You notice that the tea begins to get cloudy and a white powder begins to form on the bottom of the cup. What is happening and why does ...
0
votes
0answers
16 views

What effect would di-ammonium phosphate have on glass production

Di-ammonium phosphate (DAP) burns off at approximately 300 degrees. The production of glass (with the help of soda ash) is approximately 6 times higher in temperature. What effect would DAP have on ...
1
vote
1answer
49 views

I am confused about the stability of carbanion III and IV in the image

I am confused about the stability of carbanion III and IV in the image, I think III is more unstable because of electron donating effect (+R) of -OCH3 group but my book says III is more stable than ...
-7
votes
0answers
37 views

8.60 mi to m conversion [on hold]

Convert 8.60 mi to m. Correct answer is 13840 m. My effort: My logic is that mi and km cancels, 8.60 divide by 0.62137 divide by 1000. I know you need to multiply by 1000 but that would mean ...
-1
votes
0answers
17 views

A 4.50-g nugget of pure gold absorbed 276 J of heat. The final temperature was 25.0 degrees Celsius. What is the initial temperature? [on hold]

If someone could just let me know how to set up this equation I could find the rest. Thank you.
-5
votes
0answers
25 views

About Rubidium perchlorate [on hold]

What is the formula for rubidium perchlorate and its molecular weight? If this compounds has weight of 84.7g, how many moles of oxygen are there? How many molecules are present in the compound?
0
votes
0answers
42 views

Is there any type of liquid, other than mercury, that PTFE teflon is known to “float” to the surface in?

The specific gravity of PTFE teflon is roughly 2.3. I have a 3/8" diameter sphere made up of entirely PTFE teflon, and I would like for it to float to the surface when dropped into a liquid. Does ...
-1
votes
0answers
20 views

The percentage yield for both the Nitrogen(N2) and the Nitric Oxide(2NO) for the following formula: H2 + 2NO(1.2 g) ---> N2(0.44 g) 2H2O [on hold]

The percentage yield for both the Nitrogen(N2) and the Nitric Oxide(2NO) for the following formula: H2 + 2NO(1.2 g) ---> N2(0.44 g) 2H2O
-1
votes
0answers
23 views

Assuming STP, 250 liters of heptane (C7H16) undergo complete combustion [on hold]

1) Write the balanced equation for this reaction. 2) How many moles of each product are formed? 3) How many grams of each product are formed? 4) How many liters of each product are formed, assuming ...
0
votes
0answers
20 views

75 grams of sodium carbonate react with 65 grams of lead (II) perchlorate [on hold]

1) Write the balanced equation for this reaction. 2) Determine the limiting reagent. 3) How many grams of each product are formed? 4) How many moles of the excess reagent remain, assuming a 100% ...
0
votes
0answers
17 views

How to calculate the measured voltage? [on hold]

$17.0\ \mathrm{g}$ of $\ce{AgNO3}$ are dissolved in $100\ \mathrm{mL}$ of water. At a temperature of $298\ \mathrm{K}$ a polished silver sheet is immersed in the solution and connected to a voltmeter. ...
-2
votes
0answers
21 views

What are primary and secondary valancies at atomic level? [on hold]

Is Primary valency the combining capacity of metal ion in complexes by which it fulfills its octet and Secondary valency the combining power of metal ions in complexes by which it combines with other ...
1
vote
0answers
30 views

LiCl is soluble in pyridine while other halides are not

LiCl is soluble in pyridine, while other Li halides are not, why is this? I know that LiCl is deliquescent Like MgCl and Li halides are covalent and are soluble in organic solvents, then, why is it ...
1
vote
3answers
29 views

Liquification of gas to liquid at critical temperature

The gas that liquifies first, when cooled from 500K to its critical temperature given in parenthesis is a) $\ce{CO2}$ (304.1 K) b) $\ce{NH3}$ (405.5 K) c) $\ce{O2}$ (154.3 K) d) $\ce{N2}$ (126.0 ...
0
votes
0answers
14 views

Is there a convention as to what order to write reactants and products in a redox reaction?

When doing homework, it can be time-comsuming to check the answers in a redox reaction due to different order of the reactants and products. For example, while $$\ce{2MnO4- + 5Fe^2+ + 16H+ -> ...
0
votes
0answers
58 views

What is the IUPAC name of [Cr(H2O)5Cl]Cl2.H2O [on hold]

Without water it should be pentaaquachlorochromium(III) chloride but how is the complex named with water of crystallisation?
0
votes
1answer
49 views

How to determine “overall rate law” from graphs of different concentrations?

I need to understand how to do this for a lab. The question is: A student finds that the kinetics graphs are most linear for ln(CV) vs. time [CV meaning a solution called Crystal Violet - me]. The ...
-2
votes
0answers
30 views

Highest Vapor Pressure [on hold]

Which of the following solutions would have the highest solvent vapor pressure? 20 mL of 0.08 molal $\ce{MgI2}$ 50 mL of 0.10 molal $\ce{NaI}$ 12 mL of 0.35 molal $\ce{C3H17OH}$ 100 ...
-3
votes
0answers
16 views

Calculate the percentage of sulfur and oxygen in: sulfur dioxide & sulfur trioxide [on hold]

It says to divide the mass of the sulfur by the mass of the compound, but I'm having trouble trying to figure out how to find the mass of the compound.
-4
votes
0answers
22 views

General Chemistry- Density Problem [on hold]

Consider two solids, one with a density of 2.53 g/mL, and the other with a density of 8.35 g/mL. If you mix 1.00 mL of each of the two substances together, what is the density of the mixture? If you ...
-2
votes
0answers
40 views

Calculate the Concentration of HCO3^- and CO3^2- [on hold]

Surface water in an open area of the Indian Ocean adjacent to Kenya has an alkalinity of $2320~\mathrm{\mu equiv/L}$ and a DIC concentration of $2.03 \cdot 10^{–3}~\mathrm{mol/L}$. Calculate: ...
0
votes
0answers
18 views

Gram-Equivalents of Surface Area [on hold]

A typical small football pitch is 90 x 120 $m^2$. How many gram-equivalents of HKUST-1 would be required to achieve the same surface area? I found out that the BET surface area is 1500-2100 $m^2$/g ...
2
votes
2answers
67 views

Confusion about the oxidation state of copper in copper cyanide redissolved with excess cyanide

$\ce{CuSO4}$ when reacts with $\ce{KCN}$ forms $\ce{CuCN}$ while it is insoluble in $\ce{H2O}$. It is soluble in excess of $\ce{KCN}$ due to the formation of the following complex: a) ...
0
votes
1answer
27 views

Explain the difference in stability of permanganate ions in acidic/ alkaline solutions?

The question is such: I know that the permanganate ion is more stable in alkaline solution than in acidic solution, as the more positive electrode potential in acidic solution means more negative ...
-4
votes
1answer
36 views

How to convert from m²/cm³ to m²/g? [closed]

I have the surface area of a particle in m²/cm³ and I want to covert it to m²/g. I do not know how to do so. Would I covert from cm³ to g based on the density of that particle (i.e. cover from cm³ to ...
1
vote
1answer
55 views

What is the IUPAC name of [Co(NH3)5H2O]Cl3?

I am not getting if it is Pentaammineaquo cobalt(III) chloride or Aquopentaammine cobalt (III) chloride-should the prefix be ignored while naming the ligands in alphabetical order? Besides how should ...
-3
votes
0answers
54 views

How many grams remain after three half lives? [closed]

If a solution containing 14.0 g of a substance reacts by first-order kinetics, how many grams remain after three half-lives?
0
votes
0answers
14 views

Buffer capacity in a solution [closed]

Buffer capacity is a measure of a buffer solution\'s resistance to changes in pH as strong acid or base is added. Suppose that you have 145 mL of a buffer that is 0.220 M in both formic acid (HCOOH) ...
0
votes
1answer
34 views

Why do ethanethiol molecules have strong london dispersion forces than that of ethanol?

I know that, molecules with higher molecular weights tend to make strong london forces.Is there any other reason which makes ethanethiol to have strong london dispersion forces ??
0
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0answers
22 views

What happens to the total charge of the compound after the ions bond together [closed]

This is after you add the charges of the ions together in the compound
0
votes
0answers
15 views

Calculating the surface area of CDMOF

I am trying to use this graph to estimate the surface area of a CDMOF. The graph below is a part of the nitrogen adsorption isotherm on 0.307mg. Would I have to use the BET isotherm to work out ...
0
votes
2answers
76 views

Is sand a mixture or a compound

I was given an assignment to find out if sand is a mixture or a compound I'm sure it can't be an element. Considering the fact that a mixture contains two or more substances that are not chemically ...
-2
votes
0answers
21 views

research for chemistry class [closed]

For my science (chemistry) class, I am researching about the topic 'hydrogen.' On the task specific rubrics, it is written that I have to write about The properties that hydrogen has, as an element, ...
0
votes
1answer
17 views

How to calculate the volume of oxygen in a reaction between hydrogen peroxide and bleach using this apparatus

I know that the reaction between bleach and hydrogen peroxide produces oxygen but using this apparatus and information I need to state how to calculate the volume of oxygen released. From my initial ...
-3
votes
0answers
36 views

How can I convert and solve this problem? [closed]

Given: 123 g of 1.6 % NaNO3 solution by mass Answer is in grams NaNO3
-3
votes
0answers
23 views

What is first order reaction rate? [closed]

Molecular iodine, $\ce{I2(g)}$, dissociates into iodine atoms at $625\ \mathrm{K}$ with a first-order rate constant of $0.271\ \mathrm{s^{-1}}$? What is the half-life for this reaction? (in s) ...
-1
votes
0answers
23 views

exam question about real pH of pure water [closed]

as in the exam: which of these fact apply for water all the time $\ce{[OH^{−}]=[H+]}$ $\ce[H^+]} = 10^{-7}$ $\ce{[OH^{-}]} = 10^{-7}$ pH = 7 thank you!
0
votes
1answer
24 views

How do I figure out the amount of water (mL) and amount of Aluminum (g)?

We have a project where we have to extract copper from copper sulfate. But my group is given a powder version ($5~\mathrm{g}$), so we have to first dilute it with water and then combine it with ...
0
votes
0answers
15 views

concentration of acid [closed]

How do I find the molarity of a solution of potassium hydroxide containing $0.56~\mathrm{g/l}$? If it requires an average of $32~\mathrm{cm^3}$ of ethanoic acid to neutralise $25~\mathrm{cm^3}$ of ...
0
votes
0answers
19 views

Reduction of a nitro compound to amine [closed]

How to hidrogenate the nitro group in (2-Nitropropyl)benzene (2-Nitro-1-phenylpropane) yielding amino group? I basically need to know conditions, catalysts and have a balanced equation... A similar ...
0
votes
0answers
25 views

The curious breakdown of Calcium Carbonate

Here's the reaction: H2SO4(aq) + CaCO3(s) ===> CaSO4(s) + H2O(L) + CO2(g) I don't understand why calcium carbonate breaks down. It's not soluable in water. I could understand the hydrogen ...
1
vote
1answer
36 views

Isomers of co-ordination compounds

Does $\ce{[Co(H2O)3Br3]}$ show geometrical and optical isomerism? According to me $\ce{Co}$ should be $\mathrm{sp^3d^2}$ hybridised giving an octahedral geometry. It is of the form $\ce{Ma3b3}$ type. ...
1
vote
1answer
44 views

How to convert an oxirane to an alkanol with one additional carbon atom?

This is a question given in our exam. In the reaction, Find the reagents X and Y required for steps(ii) and (iii) are _______ and ________ respectively. I have tried in this way but I have stuck in ...