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One model of the hydrogen atom relies upon the idea that the electrons reside in stable orbits from which they can not deviate and are found outside of a small, densely packed group of protons. This model was created by-
1. Edward Teller
2. Julius Saulk
3. Niels Bohr
4. Albert Einstein
A certain toilet cleaner uses NaHSO4 as its active ingredient. In an analysis, 0.500 g of the cleaner was dissolved in 30.0 mL of distilled water and required 57.4 mL of 0.00535 M NaOH for complete neutralization in a titration.
Determine the quantity of stock 75% EtOH required to prepare 300ml of a 25% EtOH solution.
The amino acid histidine has 3 pKa's at 1.8, 6.0 and 9.3. In a 0.01 M solution of histidine, what is the concentration of protonated carboxylic acid at pH 7.4. The primary amine. The side chain
Why is the installation of an automatic sprinkling system recommended in machine shops that use lathes to fabricate titanium parts?
The next day you notice that some of the gas has leaked out. The pressure and temperature remain the same, but the volume has changed to 15.0 L. How many moles of gas (n_2) remain in the cylinder
The resulting equilibrium solution has a pH of 10.21. What is the Ksp of the salt at 22 °C?
Calculate the amount of isopentyl acetate that should be present in the reaction mixture at equibrium, based on the quantities of starting materials you used and a value of 4.2 for the equilibrium constant
Which of the following choices is insoluble? Imagine that and are cations and , , and are anions, and that the following reactions occur: Which of the following choices is insoluble? AX AY AZ BX BY BZ
Balance two of the following redox equations. Identify the oxidation half reaction and the reduction half reaction. Fe^2+ + MnO4_. Fe3+ + Mn2+
How many molecules are in 22.41 L of an ideal gas at STP? Remember the answer is supposed to be in molecules
A 2.85 g sample containing only MgO and CuO is placed in a 3.00 L container. The container is filled with CO2 to a pressure of 740 torr at 20 degrees C. After the reaction has gone to completion, the pressure inside the flask is 390 torr at 20 deg..
Calculate the number of moles of bromine present in 14.5 mL of Br2(l), whose density is 3.12 g/mL.
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