# Questions tagged [homework]

DEPRECATED. DON'T USE THIS TAG.

175 questions
Filter by
Sorted by
Tagged with
56 views

### Intesive Properties - Temperature [closed]

Why is the temperature of a sample of matter intensive? I don't think it would be extensive, but I also don't see why it would be intensive, either. It's a very basic and easy question, but I can't ...
5k views

I know this might be a silly question but I am confused with different answers of internet. My question is: Molar conductivity is given as: Molar conductivity = $\frac{\kappa}{M}$. S.I. unit of : $... 2answers 2k views ### Temperature Dependent Specific Heat of Nitrogen Calculate the change in enthalpy as 1kg of nitrogen is heated from 1000K to 1500K, assuming the nitrogen is an ideal gas at a constant pressure. The tempreature dependent specific heat of nitrogen is ... 1answer 857 views ### Effect of an inert gas on steam vapor pressure at equilibrium Suppose we have a closed container with mobile walls, so it will change its volume in order to equal the external pressure(constant) to the internal pressure. This container has inside it a liquid ... 1answer 1k views ### How do I calculate the enthalpy change when a gas is being used to heat water? The question I'm trying to answer is: Calculate the mass of butane gas that would be needed to heat$724\ \mathrm{cm^3}$of water from an initial temperature of$7.44\ \mathrm{^\circ C}$to$50.7\ \...
117 views

Hydrolysis of C$_6$H$_5$COO$^{18}$CH$_3$ with aqueous NaOH produces what final product. (a) CH$_3$$^{18}OH (b) CH_3CO^{18}ONa (c) CH_3C^{18}OONa (d) CH_3$$^{18}$ONa (e) CH$_3$OH The ...
5k views

### How to calculate the molar mass of a protein from its osmotic pressure?

I am unsure how to go about solving this question. I know how to get the osmotic pressure, but where do I go from there? I can't use the gas law since the protein is not a gas. $\pu{2.38 g}$ of a ...
39k views

### Metal vs. Styrofoam cup calorimeter?

For a metal cup as opposed to a styrofoam cup calorimeter, do you expect the enthalpy of the reaction to be higher, lower, or the same? I think the enthalpy of the reaction would be the same in the ...
4k views

### Galvanic cell using NaCl, Cu and Zn, why does it work?

Got a paper due tomorrow in chemistry, and my friends and I are totally stuck on this: Basically we mixed some regular salt (NaCl) into a glass of water and stuck a zinc nail and a copper nail into ...
2k views

### Relation between number of equivalents of reactants

Consider the reaction $\ce{Sb2S3 + F2 -> SbF5 + SF6}$. If the milliequivalents of antimony, sulfur and fluorine are x, y and z respectively, then prove that $x+y=z$. This is what I know: Number of ...
383 views

### What type of reactions are used in this synthesis?

The compound $\ce{(CH3)2CHCH2NH2}$ can be synthesised by the following route. $$\ce{CH3CH=CH2 ->[1] CH3CHBrCH3 ->[2] (CH3)2CHCN ->[3] (CH3)2CHCH2NH2}$$ What types of reaction are used in ...
7k views

### How does this method of calculating the water equivalent of a calorimeter work?

I am doing a AP Chemistry lab in which we determine the heat capacity of a calorimeter (a concept that seems like it should depend on a lot more than just the calorimeter.) We have to calorimeters ...
4k views

### How to make copper plating solution?

I intend to make the following composition of copper plating solution: \begin{array}{c:c} \rm material & \rm concentration \\\hline \rm Copper sulfate & \pu{200 \frac{g}{L}} \\ \rm ...
21k views

### How does the polarity of the eluent and sample affect the Rf value in thin layer chromatography?

A three-component mixture (X, Y, Z) was separated using normal phase TLC. Three eluents of varying polarity were used. Select the TLC plate that was developed using the least polar eluent (click on ...
765 views

### Precipitation of citric acid by CaCl2 and Ca(OH)2? [closed]

I need to precipitate citric acid from an aqueous solution in the form of calcium citrate. There are, to my knowledge, two different methods of doing this: using $\ce{CaCl2}$ and which will react ...
2k views

9k views

### Why and how carboxylate ion has greater stability than carboxylic acid?

I found it written in my textbook. I think it's a misprint, I can't think of any logic behind this statement. I've only learned that ion is less stable specie so carboxylate ion cannot be more stable ...
124 views

### Arranging different oxygen-containing organic compounds by decreasing acidity

I am facing difficulty in the following problem. Arrange the following compound in decreasing order of acidity. It is clear that conjugate base of (Q) is more stable.hence it is most acidic.in R) ...
1k views

### When finding hybridisation of atoms, why are double bonds and triple bonds only considered once?

To figure out what hybridization an atom has is to just count the number of atoms bonded to it and the number of lone pairs. Double and triple bonds still count as being only bonded to one atom. (...
324 views

### Equivalent Line Angle Structures?

Are the following equivalent structures for 2,2-dimethylpropane? I think so, because my rendering simply rotates the cross 45 degrees! Also, regarding 3,3-diethylpentane, are these both equally ...
302 views

### Using gas laws to find density

An unknown gas at $\mathrm{63.1\ ^\circ C}$ and $\mathrm{1.05\ atm}$ has a molar mass of $\mathrm{16.04\ g/mol}$. What is the density of the gas? I know I need to use the $pV=nRT$ equation but it ...
1k views

### How can I derive whether the methyl cation or anion is planar?

According to VSEPR theory, in which species do all the atoms lie in the same plane? $\ce{CH3+}$ $\ce{CH3-}$ (A) 1 only (B) 2 only (C) both 1 and 2 (D) neither 1 nor 2 My try: ...
2k views

### Reaction of 1,1-diphenylethanol on Montmorillonite K10 under microwave radiation

What is the product of 1,1-diphenylethanol + Montmorillonite K10 Clay undergoing microwave radiation? What is the mechanism for it? My effort: 1,1-diphenylethanol + Montmorillonite K10 Clay catalyst ...
56 views

1k views

### Hess's Law/Enthalpy of reaction

The problem: Chloroform, $\ce{CHCl3}$, is formed from methane and chlorine in the following reaction: $$\ce{CH4(g) + 3Cl2(g) ->3HCl(g) + CHCl3(g)}$$ Calculate $\Delta rH^{\circ}$, ...
335 views

### Interpretation of an H NMR

I am fairly new to NMR and require assistance to analyze and interpret the NMR I have provided (sorry for it being vertical). This is an unknown compound that I have derived during one of my lab ...
8k views