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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 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
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
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+.
Water and phenol are only partially miscible at temperature below 66.8oC. In a mixture prepare at 29.6oC from 50.0g water and 50.0g phenol, 32.8g of phase consisting of 92.50% water and 7.50% phenol
The ionization potential for a certain atom is 350Kj/mol. If the electron is in the first excited state, the ionization potential is 105 kj/mol. If the atom undergoes deexcitation, what would be th
How many liters of hydrogen gas are collected over water at 18 degrees Celsius and 725 mmHg when 0.84g of lithium reacts with water? Aqueous lithium hydroxide also forms.
Calculate the heat produced by combustion per liter of methanol. Methanol has a density of 0.791 g/ml. Calculate the mass of CO2 produced per kj of heat emitted.
Explain the relative reactivities for butly chloride, sec-butyl chloride, and tert-butyl chloride with NaI acetone in terms of the structure of the transition state.
A gaseous mixture of O2 and N2 contains 30.8 percent nitrogen by mass. What is the partial pressure of oxygen in the mixture if the total pressure is 565 mm Hg?
A 0.1569-g sample of solid magnesium is burned in a bomb calorimeter that has a heat capacity of 1769 J/° C. The calorimeter contains exactly 251 g of water, and the temperature increases by 1.1
You have a 25kD histidine tagged bacterial protein (100% pure). You apply this pure protein to a Ni+2 agarose column. Then you apply a crude mouse cell extract to the column.
The temperature of a household refrigerator is maintained at 0C and the temperature of the room at 25C. The heat leaking into the refrigerator from the warm room is 8*10^6 J every 24 hours, enough t
Two samples an aqueous solution show no precipitate when AgNO3 or BaCl2 is added. what anions are shown to be conclusively presnt in the unknown solution?
How much limestone in kilograms would be required to completely neutralize a 6.2x10^9 L lake containing 6.5x10^-3 g of H2SO4 per liter?
A nickel compound NiL2(where L is a halide) has a molar absorptivity of 1250(mol/L)^-1cm^- at 425nm (max) when a 50.00mL solution containing 0.00109g of this compound was analyzed using the same pro