453 Answered Questions for the topic chem

Chem Chemistry

02/10/19

Which statements(s) is/are true?
van der Waals equation: (P + n2a/V2)(V - nb) = nRT where a and b are van der Waals constants. Textbook states: The constant a relates to the number and distribution of electrons, which relates to... more
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Chem Chemistry

02/10/19

The root-mean-square velocity of a gas molecule is
The root-mean-square velocity of a gas molecule isa) directly proportional to the square root of its temperature in Kb) inversely proportional to its kinetic energyc) directly proportional to the... more
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Chem Chemistry

02/10/19

An environmental engineer analyzes a sample of air contaminated with sulfur dioxide. To a 500 mL sample of air at 700 torr and 38C, she adds 20.00 mL of 0.01017 M aqueous iodine, which reacts as follo
An environmental engineer analyzes a sample of air contaminated with sulfur dioxide. To a 500 mL sample of air at 700 torr and 38°C, she adds 20.00 mL of 0.01017 M aqueous iodine, which reacts as... more
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Chem Chemistry

02/09/19

A cylinder with a frictionless movable piston contains an ideal gas at 400K. After the temperature of the cylinder is increased to 800K at constant barometric pressure
A cylinder with a frictionless movable piston contains an ideal gas at 400K. After the temperature of the cylinder is increased to 800K at constant barometric pressure, which of the following will... more
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Chem Chemistry

02/09/19

Nitrogen boils into a gas at -195.8 Celsius. What temperature is this in Kelvin?
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Chem Chemistry

02/08/19

A sample of 0.400 L Ne initially at 1.50 atm and 240.ºC is mixed with a 0.150 L sample of O2 initially at 550. torr and 130.ºC in a 500. mL flask held at 25.0ºC. Find the total pressure in the flask.
A sample of 0.400 L Ne initially at 1.50 atm and 240.ºC is mixed with a 0.150 L sample of O2 initially at 550. torr and 130.ºC in a 500. mL flask held at 25.0ºC. Find the total pressure in the... more
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Chem Chemistry

02/08/19

A sample of ammonia gas is completely decomposed to nitrogen and hydrogen gases. If the total pressure is 866 mmHg, calculate the partial pressure of nitrogen. 2NH3(g) --> N2(g) + 3H2(g)
A sample of ammonia gas is completely decomposed to nitrogen and hydrogen gases. If the total pressure is 866 mmHg, calculate the partial pressure of nitrogen. 2NH3(g) --> N2(g) + 3H2(g)Please... more
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Chem Chemistry

02/08/19

A 425-mL sample of hydrogen is collected above water at 35°C and 763 torr. Find the volume of the hydrogen sample when

A 425-mL sample of hydrogen is collected above water at 35°C and 763 torr. Find the volume of the hydrogen sample when the temperature falls to 23°C, assuming the barometric pressure does not... more
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Chem

01/12/19

If you are runnning the following chemical reaction: 4NH3 + 5O2 > 4NO + 6H2O. If I want to make 18.0grams of water, how much NH3 do I need?
Need help quick!!!! I don’t know what I’m doing!!!!!!!!!!!
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12/10/18

C12H22O11(aq)+H2O(g)->4C2H5OH(l)+4CO2(g) Find the theoretical yield and the percent yields of ethanol if 680.g sucrose undergoes fermentation and 303.5g ethanol is obtained.
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Chem

08/27/18

Enter the molecular formula for butane
Express your answer as a chemical formula 
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08/27/18

what is the structure of glutamic acid and lysine at pH 2 and pH 11?
what is the structure of glutamic acid and lysine at pH 2 and pH 11?
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Chem Chemistry

08/15/18

the dimensions of a box are measured to be 18.4 inches by 17.92 inches by 26 inches. the volume of the box can be found by multiplying these three dimensions. w
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Chem

08/14/18

Using density as a unit conversion, calculate the volume of one ounce (30.0)g of gold.
Calculateting the volume 
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Chem

07/11/18

a sulfide of an element A, contains 3 atoms of S per formula unit and is 43.71% S. A) What is the formula weight of the compound? B) AxS3
plsssss help meee I really need the answer.
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06/01/18

Two solutions: one has pH=2 and the other has pH=4
pH=2  pH=4 
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Chem

05/16/18

What is the mass of a sample of O2 gas?
Which has a pressure of 740. mmHg, at a temperature of 25 degree Celsius, in a volume of 250. mL?
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Chem

05/16/18

At STP, what is the mass of 11.2 liters of O2 gas?
I tried solving this myself and got 16.0 g, but wasn't quiet to sure if I did the problem right.
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Chem

05/11/18

How do I find the formula of Copper(1) Sulfide?
Please explain in detail the steps in order to solve this equation.
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Chem Chemisty

04/25/18

calculate the molarity of 1270g of K2PO4 in 4.0 L aqueous solution
i do not know how to d0 it at all help
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Chem

04/15/18

HOMEWORK WITH CHEMISTRY
For the elements with the electron affinities given in the table in the introduction, which element is most likely to accept an electron?SBeP
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Chem

04/13/18

HOMEWORK HELP
What wavelength λ should the astrophysicist look for to detect a transition of an electron from the n=7 to the n=3 level?   value..... ; Units......
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Chem

04/13/18

HOMEWORK WITH CHEMISTRY
Calculate the energy of a photon of electromagnetic radiation at each of the following wavelengths.Part A488.0 nm (wavelength of argon laser) Part B12.24 cm (wavelength of microwave oven) Part... more
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Chem Gas Laws

03/17/18

Calculate the volume of co2 in l, produced when 300 g of butane is burned is burned completely in oxygen. The gas volume is measured at slc
I don’t understand how to find the mole using only the kg of butane
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02/25/18

Whats the correct way to approach this concentration question?
Part I. Preparation of a Fe(III)-oxalate complex: (4 pts) a) Recorded mass of Fe(NH4)2(SO4)2●6H2O used: 1.3807 (g) b) pH paper color upon addition of oxalic acid: Magenta c) Does this color... more
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