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A certain first-order reaction has a rate constant of 2.75 x 10-2s-1 at 20oC. What is the value of k at 60oC if E = 105 kJ/mol?
Covalent modification of enzymes is an important means of regulation. Explain the steps by which phosphorylation decreases the rate of formation of pyruvate from phosphoenolpyruvate in the Liver.
Divers often inflate heavy duty balloons attached to salvage items on the sea floor. If a balloon is filled to a volume of 3.00 L at a pressure of 2.50 atm, what is the volume of the balloon when it
If an excess of 2.45 M HCL is used with 12.75 g of sodium bicarbonate at 732 torr and 38 C, what volume of carbon dioxide is obtained?
If a particular heliox mixture to be carried by a scuba diver is at a pressure of 7.00 atm, what should be the partial pressure due to helium in order to maintain the pressure due to oxygen at 0.21
The initial volume of a gas cylinder is 750.0 mL. If the pressure of a gas inside the cylinder changes from 840.0 mmhg to 360 mm hg , what is the final volume the gas occupies?
When 0.629 g of Na3PO4*12H2O (molar mass = 380.12g/mol) and 0.527g of BaCl2*2H2O (molar mass = 244.30g/mol) are mixed with water forming 500ml of solution, how many grams of Ba3(PO4)2 (molar mass = 60
Why is it necessary to heat the obtained mixture of tea leaves in water when conducting the experiment to extract caffeine from tea leaves?
Consider the reaction of sulphuric acid, H2SO4, with sodium hydroxide, NaOH.
At the boiling point of water,the Fahrenheit temperature is 112 degrees higher than the Celsius value. At the the freezing point the difference is only 32 degrees. At what temperature do both scales
Calculate the theoretical mass of hydrogen chloride formed in the reaction of sulfuric acid 2.00 mol with sodium chloride 150 g. Hydrogen chloride can be prepared by the following reaction:
Explain why the separatory funnel should not be shaken after adding sodium carbonate in a caffeine-extraction-from-tea-leaves lab?
Calculate the density of vanadium which crystallizes in a body centered cubic lattice, the length of the edge of a unit cell being 300 pm.
Gallium arsenide is a common semiconductor. This material becomes a conductor when irradiated with infrared light whose frequency is 3.43 × 1014 s-1. Calculate the band gap of GaAs in kJ/mol.
A KCl solution is prepared by dissolving 25.0 g KCl in 250.0 g of water at 25°C. What is the vapor pressure of the solution if the vapor pressure of water at 25°C is 23.76 mm Hg?
0.100 moles of NaOH are combined with 0.125 moles acetic acid. the mixture is taken to a final volume of 100.0ml. what is the expected pH of the solution?
Describe the difference between the temperature vs time cooling curve of a pure substance and a solution.
Briefly, explain how to make an acetic acid/ acetate buffer? Give the chemical reaction between this buffer and a small addition of base (OH-), which explains why the pH of the solution remains abou
Which of the following reagents might serve as the basis for a simple chemical test that would distinguish between pure 1-hexane?
The molecule H2S2 has a linear arrangement of its atoms. Number all sulfur atoms along the chain from 1 to 4. Find the oxidation number of each sulphur in the molecule from the first to the fourth.
The vapor pressure of a water-insoluble organic substance is negligible at 100 degree C. Can this substance be purified by steam distillation? explain.
A 17.9 g sample of an alloy at 98.0°C is placed into 127.2 g of water at 22.0 °C in an insulated coffee cup with a heat capacity of 9.2 J/K. If the final temperature of the system is 35.0&de
A sample of N2(g) was collected over water at 25 degrees Celcius and 730 torr in a container with a volume of 340 mL. The vapor pressure of water at 25 degrees Celcius is 23.76 torr. What mass of N2
If the half-life of a radioactive element is 30.0 years, how long will it take for a sample to decay to the point where its activity is 70.0% of the original value?
Rhenium-186 is a ß-emitter with a half-life of 90.0 hours. How long would it take for the activity in a sample of this isotope to decay to exactly one-third of its original value?