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Determine the pH of an equilibrium aqueous mixture of 1.0 M glycine (Gly) and 0.5 M HCl assuming that pKdn(aN) = 9.8 for the alpha-amino group, and pKdn(aC) = 2.4 for the alpha-carboxyl group of th
Lead (Pb) has an electron configuration of [Xe]6s^2 4f^14 5d^10 6p^2. Use this information to explain why it commonly forms 2+ and 4+ ions. What are the electron configurations of each of these ions
Three gases (8.00 of methane, , 18.0 of ethane, , and an unknown amount of propane, ) were added to the same 10.0- container. At 23.0 , the total pressure in the container is 3.80 .
Assuming that air contains 78% N2, 21% O2, and 1% Ar, all by volume, how many molecules of each type of gas are present in 1L of air at STP?
What is the ionization energy of rubidium atoms (in kilojoules per mole) if light with Lambda = 58.4 nm produces electrons with a velocity of 2.450 x 10^6 m/s? (The mass of an electron is 9.109 x 10
A 10.00 mL portion of HCL sol was diluted to 50.00 mL. If 5.00 mL of this solution required 41.00 mL of 0.2550 M sodium hydroxide for complete neutralization, what was the concentration of the orig
Steam from a boiling teapot (100 °C) hits a person's hand and causes a burn. Assuming 1 g of water vapor condenses to liquid (at 100 °C) and then cools to 40 °C when it hits the hand, wh
Ethane, C2H6 burns in the air. How many L of oxygen are required for complete reaction with 5.2 L of ethane? How many L of water vapor are produced?
A compound has a specific rotation of -39.0. A solution of the compound (0.206 g/mL) has an observed rotation of -7.17 when placed in a polarimeter tube 10. cm long. What is the percent of each ena
The 13C nucleus is a spin 1/2 particle, which means it can orient in two directions in a magnetic field (with the field and against it).
A 1.553 g sample of chymotrypsin is placed into 100.0 mL of water. When this solution was separated from pure water by a semipermeable membrane, the resulting osmotic pressure supported a column of
What two families of elements in the periodic table generally do not accept additional electrons (i.e. which ones have electron affinities close to or above zero)?
If the average speed of an oxygen molecule is 4280 cm/sec at 25C, what is the average speed of carbon dioxide molecule at the same temperature?
Argon gas is ten times denser than He gas at the same temperature and pressure. Which gas is predicted to effuse faster? How much faster?
A car travels around a level circular track 500 m in diameter. If the coefficient of static friction between the tires and the track is 0.7, then what is the maximum speed the car can maintain while
A chemical engineer studying the properties of fuels placed 1.475 g of a hydrocarbon in the bomb of a calorimeter and filled it with O2 gas. The bomb was immersed in 2.407 L of water and the r
Calculate the volumes of air and hydrogen gas at 14°C and 1.00 atm that are necessary to produce 1.00 multiplied by 103 kg of pure molybdenum from MoS2. Assume air contains 21% oxygen by volume
A 0.40 kg mass attached to the end of a string swings in a vertical circle of radius 1.8 m. At an instant when the string makes and angle of 40 degrees below the horizontal the speed of the mass is
A 200 g object tied to a string 80 cm long travels in a vertical circle of radius 80 cm. At the top of the circle the speed of the object is 4.5 m/s. What is the tension in the string at this positi
A block of mass 5.0 kg is pulled across a horizontal surface at a constant speed by a force 14 N directed at 35 degrees from the horizontal. What is the coefficient of kinetic friction between the
The specific rotation of (R)-(+)-glyceraldehyde is +8.7. If the observed specific rotation of a mixture of (R)-glyceraldehyde and (S)-glyceraldehyde is +2.5, what percent of glyceraldehyde is prese
A distant galaxy emits light that has a wavelength of 479.2 nm. On earth, the wavelength of this light is measured to be 481.6 nm. Find the speed of the galaxy relative to the earth. (Give your answ
(a) Find the net gravitational force exerted by these objects on a 50.0 kg object placed midway between them. (b) At what position (other than the infinitely remote ones) can the 50.0 kg object be p
Luminol has a molecular weight of 177 g/mol. The forensic technician at a crime scene has just prepared a luminol stock solution by adding 10.0 g of luminol into a total volume of 75.0 mL of H20.
To a 1.00 L flask is added 0.010 moles of Cu2+ and 0.030 moles of NH3. The Cu2+ and NH3 combine to form several complex ions of copper that have formulas ranging from Cu(NH3)2+ to Cu(NH3)42+.