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9 views

Which of the following ions is expected to have the lowest value of molar conductance in aqueous solution?

Which of the following ion is expected to have lowest value of molar conductance in aqueous solution?? a. $\ce{Na+}$ b.$\ce{K+}$ c.$\ce{Rb+}$ d.$\ce{Cs+}$
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1answer
17 views

How does a limiting reactant relate to the concentration of ions in solution?

Given the question A sample of 1.50 g of lead(II) nitrate is mixed with 125 mL of 0.100 M sodium sulfate solution. What is the limiting reactant in the reaction? Calculate the concentrations of ...
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0answers
21 views

Plotting Angular Wave Functions of Orbitals

I'm taking an introductory Chemistry class, and we are asked to plot the angular wave functions for orbitals. What exactly does the angular wave function convey or represent? I'm very confused as to ...
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2answers
41 views

Given the mass of precipitate, how can I calculate the relative amount of the original dissolved compounds?

A simple mixture of $\ce{NaCl}$ and $\ce{NaBr}$ weighing $0.180~ \mathrm{g}$ is treated with $\ce{AgNO3}$ solution to give $0.3715~ \mathrm{g}$ of precipitate. Calculate the content of $\ce{NaCl}$ and ...
6
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1answer
72 views

Determine what the unknown element is

A piece of electronic equipment originally contained 1.250 g of a valuable metal. Corrosion over time has given a compound of formula $\ce{M(OH)3}$, which is isolated but not weighed. This compound is ...
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2answers
36 views

Finding initial pressure in a chemical equilibrium

Consider the equilibrium below. If $K = 4$ and initial pressures of $\ce{CO}$ and $\ce{H2O}$ are equal, giving a total pressure of $1.5~\mathrm{bar}$ at equilibrium. What was the initial pressure of ...
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0answers
33 views

Airbags have become a standard safety feature in modern automobiles. [on hold]

Airbags have become a standard safety feature in modern automobiles. Several airbags are placed in the critical locations within automobiles and they inflate almost instantly upon impact to protect ...
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0answers
35 views

From an electron configuration, how do we know if it is ionic or covalent? [on hold]

Hi I'm back to contribute some questions! Well let's say 2.8.2 and 2.8.1 ....how are we supposed to know if they are covalent or ionic?
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0answers
19 views

How do you calculate average Molecular mass? [on hold]

Molecular mass of air, assuming $80\%$ is $\ce{N2}$ and $20\%$ $\ce{O2}$. Step by step would be great. And gas weight is $M\cdot n$, right? And n is number of molecules/Avogadro's number?
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1answer
26 views

Rate of Consumption [on hold]

For a practice test I had to do this question: An experiment is done to determine the rate of the following reaction: $$\ce{2Al(s) + 6HCl(aq) → 3H2(g) + 2AlCl3(aq)}$$ ...
7
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1answer
54 views

Caclulating the Solubility of Fluorite in River Water

I am attempting to work through problems in Chapter 4 of Brunlow's 1979 Geochemistry text. The question is "Calculate the solubility of fluorite in river water with the average composition given in ...
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2answers
35 views

Titration and calculation of the number of moles after a mix

I have the following problem on an assignment that I don't understand. Given the following balanced equation for the titration of HCl with NaOH: $\ce{HCl + NaOH -> NaCl + H2O}$ The initial ...
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1answer
28 views

How much oxygen and carbon must be combined to create exactly 100.0 g of CO2 without any leftover? [on hold]

I'm completely stumped on this one. Everything needed for the question is in the title. I know that 20.0 g of carbon and 32.0 g of oxygen make 44.0 g of $\mathrm{CO_2}$ with 8.0 carbon leftover.
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2answers
33 views

Find new energy level of H atom absorbing a photon

The problem I'm on says a ground state H atom absorbs a photon of 97.20nm, what energy level does it jump to. So n would start at 1. I don't have an equation specifically for a change in n though. I ...
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0answers
20 views

Finding mass equivalence of a photon

The problem has a flame emitting a wavelength of 589nm, and asks for the mass of one photon of that wavelength. I tells me that 1 J = 1 kgm^2/s^2. I converted to J using E=(hc)/wavelength. I'm not ...
1
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1answer
63 views

Using combined gas law to calculate the volume of dry hydrogen gas

Pv/t = pv/t is the equation of combined gas law. Say if the volume of wet hydrogen gas is 40.48ml does this equation still work if part of that volume is water vapor. Or in another word, does the ...
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0answers
15 views

How to calculate the volume of dry hydrogen in magnesium/ HCl reaction [duplicate]

Sorry if this will sound trivial, I am not too sure if the moles of $H_2$ in the equation $Mg(s) + 2HCl(aq)\rightarrow MgCl_2(aq) + H_2$ is that of dry or wet hydrogen. If the $H_2$ refers to wet ...
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0answers
292 views

How do I calculate the amount of NaOH required to mix with a weak acid to get a given pH? [closed]

Calculate how many $\mathrm{mL}$ of a $0.1~\mathrm{M}$ $\ce{NaOH}$ solution was added to a titration mixture of $100~\mathrm{mL}$ of $0.1~\mathrm{M}$ $\ce{HCOOH}$ ($\mathrm{p}K_a = 3.75$) solution to ...
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1answer
27 views

Stoichiometry of Gaseous Reactions

The Question: How many liters of $H_2S$ would be required to react with excess oxygen to produce $12.0$ $L$ of $SO_2$? The reaction yield is $88.5$%. Assume constant temperature and pressure ...
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2answers
40 views

Write a Net Ionic Equation to Represent the Reaction of Aqueous Ammonia with Propionic acid

I would like to know how do I begin to solve a problem like this? That is finding the formula equation? I would assume that it would be $$ \ce{NH3 + CH3CH2COOH -> NH3 + CH3CH2COOH + H2O} $$ I ...
2
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2answers
44 views

How do I figure out the relative polarity of organic compounds?

It's a question on my quiz which I guessed right and couldn't do the reasoning: Based on the intermolecular forces, predict the boiling points of the following substances and list them in the ...
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1answer
34 views

Given volume of reagents find the chemical formula of nitrogen oxide

I have difficulties solving a high school type of problem. $\ce{NH3 + O2 -> N_{x}O_{y} + H2O}$ I know that there is 1 $m^3$ of both the nitrogen oxide and the ammonia and the volume of oxygen on ...
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1answer
22 views

Are the rules proposed by slater for the calculation of Z effective right?

Today, I studied Slater's rules for calculating the effective nuclear charge. But, one particular line " The shielding power of the d and f orbital is lesser in comparison to the p and s orbitals" ...
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0answers
15 views

How to identify a redox reaction and how to assign oxidation numbers [closed]

Indicate whether the balanced equations involve redox equations. Identify the elements that undergo changes in oxidation number. $\ce{I2O5(s) + 5CO(g) -> I2(s) + 5CO2(g)}$ ...
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0answers
51 views

What is the relative atomic mass of P? [closed]

8.1g of a metal oxide with a formula of PO is completely reduced by excess carbon powder 6.48g of metal P. What is relative atomic mass of P? [RMA: O;16) Can anyone please explain this question? I ...
2
votes
1answer
21 views

A metal Q forms a carbonate and a nitrate. What is the molecular formula of the nitrate of Q?

Good day. This is my first post in any chemistry site. A metal $\ce{Q}$ forms a carbonate and a nitrate. The molecular formula of the carbonate of $\ce{Q}$ is $\ce{QCO3}$. What is the molecular ...
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1answer
16 views

Is the volume of a protein substrate equal before and after an enzymatic reaction? (pepsin degrading egg white suspension)

I am trying to determine the reaction rate of pepsin at different pH values by performing an experiment. I am using egg-white suspension as the substrate and am adding differently concentrated ...
0
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0answers
24 views

Orbital representations [duplicate]

The usual 'orbitals' that we draw are drawn with the axes shown and everything. But orbitals are really only 1 electron wave functions of 3 dimensions... Therefore, they can't be plotted as such in ...
-3
votes
0answers
32 views

Consider the following reaction: SO2Cl2(g)⇌SO2(g)+Cl2(g) [closed]

Consider the following reaction: $\ce{SO2Cl2(g)⇌SO2(g) + Cl2(g)}$ A reaction mixture is made containing an initial $\ce{[SO2Cl2]}$ of $2.2×10^{−2}$M . At equilibrium, $\ce{[Cl2]}= 1.1×10^{−2}$M . ...
3
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0answers
41 views

Irreducible Representations to Classify Atomic Orbitals [duplicate]

I have some major confusion on Irreducible Representations. An example of a problem i have is Based on the character table for the point group of each of the follwing molecules, which irreducible ...
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2answers
30 views

Hydrolysis of Dimethyl dichlorosilane

Dimethyl dichlorosilane will undergo hydrolysis to form siloxane polymers. But why would its carbon analog Dimethyl dichlorocarbon not be able to undergo a similar hydrolysis reaction to form ...
3
votes
1answer
39 views

Electrolysis of a solution of zinc sulfate

Thr question is: Describe how zinc metal can be obtained from zinc sulfate solution by electrolysis. A labelled diagram is acceptable. Include all the products of this electrolysis. The ...
3
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1answer
683 views

Determining iron content in spinach from absorbency

I used a spectrometer to find the absorbency of 5 solutions with different iron concentrations. ...
2
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2answers
197 views

What splitting pattern is this?

I am trying to find the structure of an unknown molecule. What is the splitting pattern of these sets of lines? I think my unknown molecule is butanol and the hydrogens this splitting pattern is ...
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0answers
47 views

Finding Root-Mean-Square of Ne using kinetic energy?

I am not being able to solve the following question: -Find the root-mean-square speed of $\ce{Ne}$ atoms at the temperature at which their kinetic energy is $\mathrm{6.24\ kJ/mol}$. I tried ...
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0answers
25 views

How do I determine the Ka using an ICE chart of an unknown acid titration using NaOH

two trials were ran using 10 mL of an unknown acid into a NaOH solution until the pH reached equivalence (pH of around or as close to 7). Using this data, I have made two graphs and I am supposed to ...
-1
votes
1answer
41 views

Use The Half Reaction Method to Balance the Following Equation in Acidic Solution [closed]

$\ce{Fe^2+ + MnO4- -> Fe^3+ + Mn^2+}$ What steps should I take?
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2answers
58 views

How to determine peroxy oxygen?

Which of the following compound doesn't contain peroxy oxygen? $\ce{CrO5}$ $\ce{Cr2O3}$ $\ce{Na2O2}$ $\ce{BaO2}$ I think peroxy oxygen peroxide(am I right?). I have read in this answer that there ...
0
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0answers
22 views

Assign the configurations of the stereo centres in (-)-menthol and (+)-neomenthol?

I have to assign R or S to the chiral centres in (-)-Menthol and (+)-Neomenthol. The results I got are shown below in the picture. However, when I looked on wikipedia to check my answers they ...
1
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0answers
39 views

Questions about Absorption and Emission Hydrogen Spectral Lines

I have a few questions about absorption and spectral lines, they're kinda of small and assorted so sorry for making a rather unspecific title but they didn't warrant having their own individual posts. ...
3
votes
1answer
40 views

Find the initial volume of the weak acid given a titration graph

Question Below is a picture of a titration between a weak acid, $\ce{HA}$, and a 0.150 M $\ce{NaOH}$ solution. Find the initial volume of the weak acid in millilitres in this titration. My work ...
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votes
1answer
24 views

Effect of valence electrons on an atom's electronegativity

I had a question about carbon atom specifically, carbon have 4 valence electrons, with electronegativity of 2.55(approximation), now if I was to fire electrons at the carbon atom, each carbon will ...
0
votes
1answer
39 views

Why is C4 of butynone electrophilic?

A question asks whether C4 in 3-butyne-2-one can act as a nucleophile, electrophile, or acid (it can be more than one). The answer is that it can be both electrophilic and acidic. The acidity makes ...
2
votes
1answer
37 views

What does being an “elementary substance” mean?

Which of the following isn't an elementary substance? Ozone Sulfur diamond quartz I don't get what elementary substance means. By seeing the options and the word elementary, I guess it means ...
1
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1answer
31 views

Solubility question about magnesium oxide

The following instructions were used to prepare magnesium sulfate crystals, $\ce{MgSO4 . 7H2O}$. Step 1: Measure $50 \mathrm{cm^3}$ of dilute sulfuric acid into a beaker and warm the solution. ...
3
votes
1answer
63 views

Number of mercury atoms in a drop of mercury

The question is: A) Calculate the mass of a mercury atom in kg. B) How many atoms of mercury does a drop of mercury contain knowing that the volume of a drop of $\mathrm{Hg=0.05mL}$ and the density ...
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1answer
25 views

Dipole, Symmetrical, ASymmetrical [closed]

I don't understand what a dipole is, I kind of have an idea but not exactly. Also, how do you know if a molecule is Symmetrical or ASymmetrical. For example, the following: O2 H2O CO2
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2answers
95 views

How do I determine the mass percent of Barium nitrate and Sodium acetate in an original unknown solution

I am given $20 \mathrm {mL}$ of the unknown mixture of Barium Nitrate and Sodium Acetate dissolved in water. I am given the total mass of the two solids before they were put into the mixture. I am ...
0
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2answers
55 views

Stoichiometry & Solutions Problem

Hello I am taking college level Chemistry in high school. My teacher isn't very good at helping me solve this problem, so I found this amazing website. I just have one question. I keep getting the ...
0
votes
1answer
39 views

Undergrad Kinetic Molecular Theory

Gas A and B are placed together in a sealed container at room temperature and are pressurized to 2.5atm. After a period of time, there is a border between the two gases. Given A has a density ...