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Identify the two important classes of catalysts. Analyze the chemical reactions that take place when a biological catalyst combines with a reactant (substrate) to form an unstable intermediate.
What volume of H2s was collected at 32 C when the atmospheric pressure was 749 torr (1 atm=760 torr)? The vapor pressure of water at this temperature is 36 torr.
How many grams of methanol must be added to 7.50 kg of water to lower its freezing point to -13.0 degrees C? For each mole of solute, the freezing point of 1 kg of water is lowered 1.86 degrees Celsiu
1-bromobutane was added to a solution of sodium iodide in acetone. One of the possible side products of this reaction is dibutyl ether. Provide the mechanism of thus molecule.
For the reaction given below, the frequency factor A is 8.7 1012 s-1 and the activation energy is 63 kJ/mol. What is the rate constant for the reaction at 80°C?
How many calories are given to a household radiator when 1000 grams of 100C steam condences, and drops in temperature to 90C water?
A gas sample containing 1.56 mol at 25°C exerts a pressure of 394 torr. Some gas is added to the same container, and the temperature is increased to 50.°C. If the pressure increases to 800.
You need to make an aqueous solution of 0.180 M sodium sulfate for an experiment in lab, using a 250 mL volumetric flask. How much solid sodium sulfate should you add ?
Four ice cubes at exactly 0 degrees C having a total mass of 55.0 g are combined with 120 g of water at 76 degrees C in an insulated container. What is the final temperature of the mixture?
Which of the following statements about writing molecular, complete and net ionic equations is FALSE A net ionic equation is an equation showing only the species that actually change during the reacti
Calculate the expected change in temperature for 4.5 g of NH4NO3 dissolved in 100.0 mL of H20. Assume that the calorimeter absorbs no heat. (ie. Ccal=0)
You wish to make a 0.355 M hydrobromic acid solution from a stock solution of 3.00 M hydrobromic acid. How much concentrated acid must you add to obtain a total volume of 175 mL of the dilute soluti
A gaseous mixture of O2 and Kr has a density of 1.140 g/L at 415 torr and 300. K. What is the mole percent O2 in the mixture?
The heat capacity of liquid water is 4.18 J/g degrees C and the heat of vaporization is 40. kJ/mol. How many kilojoules of heat must be provided to convert 1.00 g of liquid water at 67 degrees C into
At room temperature (20 degrees celsius), milk turns sour in about 64 hours. In a refrigerator at 3 degrees celsius, milk can be stored three times as long before it sours.
A gas sample containing 1.35 mol at 25°C exerts a pressure of 405 torr. Some gas is added to the same container, and the temperature is increased to 50.°C. If the pressure increases to 800.
A balloon is filled to a volume of 5.0 102 mL at a temperature of 29.0°C. The balloon is then cooled at constant pressure to a temperature of 1.00 102 K. What is the final volume of the balloon?
A gaseous mixture of and contains 38.8 nitrogen by mass. What is the partial pressure of oxygen in the mixture if the total pressure is 685 ?
In a calorimeter, 10.0 g of ice melts at 0 oC. The enthalpy of fusion of the ice is 334 J/g. How much heat was absorbed?
What impurities do you think are probably in your crude aspirin product? Where do those impurities go in the recrystallization process?
What is the empirical formula of the compound? Write the carbon first and the H second in the formula and use the underscore key to denote subscripts in the formula.
When 2 moles of Mg3N2 are allowed to react with water to form ammonia gas and magnesium oxide, how many moles of H2O are required?
Effects of solvent water on the photophysical properties of a series of meta- and para-substituted anilines have been investigated by means of time-resolved fluorescence, transient absorption, and pho
Consider the reaction of magnesium metal with hydrochloric acid to produce magnesium chloride and hydrogen gas. If 3.72 mol of magnesium and 3.72 mol of hydrochloric acid are reacted, how many grams
Write balanced half-reactions and the overall spontaneous reaction. (Type your answer using the format [NH4]+ for NH4+. Use the lowest possible coefficients.)