Exam 3

exam-3-2016

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Question 1 of 1

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141327

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A _____ is used to determine the molecular weight of a substance when its molecular formula is not known.

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141330

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Nitric oxide, NO, is made from the oxidation of NH3 and the reaction is represented by the equation 4NH3 + 5O2 ---> 4NO + 6H2O . An 8.9 g sample of NH3 gives 12.0 g of NO. The percent yield of NO is

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141333

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A chemist has a sample of 1.88 M HCl. What volume of the sample does he require to prepare 200 mL of 0.45 M HCl?

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141338

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In a volumetric analysis experiment, a solution of sodium oxalate (Na2C2O4) in acidic solution is titrated with a solution of potassium permanganate (KMnO4) according to the following balanced chemical equation: 2KMnO4 (aq) + 8H2SO4 (aq) + 5Na2C2O4 (aq) ---> 2MnSO4 (aq) + 8H2O (l) + 10 CO2 (g) + 5 Na2SO4 (aq) + K2SO4 (aq) . It required 40.0 ml of 0.0335 M KMnO4 to reach the endpoint. What mass of NaC2O4 was present initially?

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141340

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A flexible vessel contains 78.00 L of gas at a pressure of 1.50 atm. Under conditions of constant temperature and moles of gas, what is the pressure of the gas when the volume of the vessel is tripled?

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141344

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Which of the following concerning the ideal gas law is/are true? 1. Pressure is directly proportional to volume when temperature and moles of gas are held constant 2. Pressure is directly proportional to moles of gas when temperature and volume are held constant 3. Volume is inversely proportional to temperature when the pressure and moles of gas are held constant

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In which of the following reactions will the pressure increase upon completion of the reaction at constant temperature?

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141355

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Rank the following regions of the electromagnetic spectrum in order of decreasing frequency. (x rays, microwaves, infrared, ultraviolet)

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141356

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Which quantum number distinguishes the different shapes of the orbitals?

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141359

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Exam 3

Question 1 of 1

Time Left

A _____ is used to determine the molecular weight of a substance when its molecular formula is not known.

Select the correct answer(s).

(0/0)

Nitric oxide, NO, is made from the oxidation of NH3 and the reaction is represented by the equation 4NH3 + 5O2 ---> 4NO + 6H2O . An 8.9 g sample of NH3 gives 12.0 g of NO. The percent yield of NO is

Select the correct answer(s).

(0/0)

A chemist has a sample of 1.88 M HCl. What volume of the sample does he require to prepare 200 mL of 0.45 M HCl?

Select the correct answer(s).

(0/0)

Select the correct answer(s).

(0/0)

A flexible vessel contains 78.00 L of gas at a pressure of 1.50 atm. Under conditions of constant temperature and moles of gas, what is the pressure of the gas when the volume of the vessel is tripled?

Select the correct answer(s).

(0/0)

Select the correct answer(s).

(0/0)

In which of the following reactions will the pressure increase upon completion of the reaction at constant temperature?

Select the correct answer(s).

(0/0)

Rank the following regions of the electromagnetic spectrum in order of decreasing frequency. (x rays, microwaves, infrared, ultraviolet)

Select the correct answer(s).

(0/0)

Which quantum number distinguishes the different shapes of the orbitals?

Select the correct answer(s).

(0/0)

Which orbital or orbitals is/are specified by the set of quantum numbers n=2 and l=1?

Select the correct answer(s).

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