What intermolecular force(s) is/are present in acetone that it would be a liquid at room temperature? Is there more than one force? If yes, which is stronger and which is weaker?
In: Chemistry
1- a. What mass of nitrogen has the same volume as 15.00 grams of hydrogen at -25oC and .750atm?
b. What is the density of an unknown gas at 258 K and 1.500 atm whose molar mass is 126 g/mole.
(Please type the answers, don't write them down on a paper)
In: Chemistry
Brass is a substitutional alloy consisting of a solution of copper and zinc. A particular sample of red brass consisting of 80.0% Cu and 20.0% Znby mass has a density of 8760kg/m3 .
What is the molality of Zn in the solid solution?
What is the molarity of Zn in the solution?
In: Chemistry
Find the pH during the titration of 20.00 mL of 0.1630 M benzoic acid, C6H5COOH (Ka = 6.3 ? 10-5), with 0.1630 M NaOH solution after the following additions of titrant.
(a) 0 ml
(b) 10.00 mL
(c) 15.00 mL
(d) 19.00 mL
(e) 19.95 mL
(f) 20.00 mL
(g) 20.05 mL
(h) 25.00 mL
In: Chemistry
Zinc sulfide, ZnS, exists in two main crystal forms. The more stable form, zinc blende, is face-centered cubic with tetrahedral coordination geometry and has density of 4.09 g/cm3. Use 184 pm for the ionic radius of S2- to calculate the ionic radius of Zn2+.
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Starting with a 30% (w/w) solution of hydrogen peroxide, how many mL would you need to dilute in order to end up with 25.00mL of a 3.6 M hydrogen peroxide solution? What are the hazards and safety precautions associated with 30% hydrogen peroxide. Assume a solution density of 1.11 g/mL.
In: Chemistry
This question is about concentration measurements and its effect on E and K.
Cu/Cu^+2 // Ag/Ag^+2
It's same voltaic cell setup directions but for different concetrations of Ag+2 solutions: 0.2M, 0.02M, 0.0020M and 0.00020M.
Calculate the E of the above different Ag+2 solution by using this form of the Nernst equation: E= E0 - (0.0257/n)*lnK where K is the qulilbrium constant and n is the number of electrons and E0 is standerd cell pontential at STP
Please show the process and explains. Thank you
In: Chemistry
Explain, in detail, why atomic radii do not increase uniformly with increasing atomic number. Give specific examples in your answer.
In: Chemistry
A sample of butane gas, C4H10, was slowly heated at constant pressure of .80 bar. The volume of the gas was measured a series of different temperatures and plot of volume vs. temperature was constructed. The slope of the line was .0208 L/K. What was the mass of the sample of butane? Please explain.
In: Chemistry
A 55.0 mL solution of 0.126 M potassium alaninate (H2NC2H5CO2K) is titrated with 0.126 M HCl. The pKa values for the amino acid alanine are 2.344 (pKa1) and 9.868 (pKa2), which correspond to the carboxylic acid and amino groups, respectively. a) how do you calculate the PH of the first equivalent and b) the second equivalent? please help
In: Chemistry
a) Describe the glass transition temperature of polymers and ceramics
b) Compare and contrast the rules that underly the formation of crystalline structures in ceramics and polymers
In: Chemistry
The energy of light photons varies with wavelength. Calculate the energy per mole of photons for each of the following colors of visible light. Red Light, ? = 691 nm Green Light, ? = 527 nm Blue Light, ? = 411 nm
In: Chemistry
use coulombs law to calculate the ionization energy in kj mol^-1 of an atom composed of a proton and an electron separated by 249 pm.
E ionization =
the formula we have states (E coulomb approx equals q1q2/r12 ?
In: Chemistry
Calculate the molar solubility of lead(II) chloride in a 0.10 M calcium chloride solution.
I keep getting 0.0017, but that is incorrect.
In: Chemistry
1) 1.95 moles of HBr in 250.0 mL flask is consumed in 1.00 minutes in the gas phase reaction 2 HBr(g) → H2(g) + Br2(g) at 150°C. The rate of reaction is __________ M∙s-1.
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3.85 |
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0.0650 |
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0.0169 |
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0.260 |
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0.0860 |
2)The reaction A → C is found to be zero order. Which of the following will give a linear plot?
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(A) vs. time |
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ln(A) vs. time |
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1/(A) vs. time |
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None of these will be linear. |
3)Which of the following is not a colligative property?
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depression of solvent vapor pressure upon addition of a solute to a solvent |
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elevation of the boiling point of a solution upon addition of a solute to a solvent |
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depression of the freezing point of a solution upon addition of a solute to a solvent |
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an increase in the osmotic pressure of a solution upon the addition of more solute |
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the increase of reaction rates with increase in temperature |
4)
Yeast and sugar are added to champagne to give the sparkle of carbonation. Under what conditions is carbon dioxide gas most soluble?
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low temperature, high pressure |
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low temperature, low pressure |
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high temperature, low pressure |
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high temperature, high pressure |
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none of these |
5)
In general, the solubility of ________ in water decreases as temperature increases.
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liquids |
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solids |
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gases |
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none of these |
6) In a solution, the solvent is:
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always water |
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the substance in the greatest amount |
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the substance that is dissolved |
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always a gas |
In: Chemistry