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Maintenance of pH is vital to the cells of all living organisms because enzyme activity is influenced by pH. What is the intracellular pH range of most cells? What are the two biological buffer systems that control pH in this range?
A flask has a mass of 78.23 g when empty and 593.63 g when filled with water. When the same flask is filled with concentrated sulfuric acid, H2SO4, its mass is 1026.57 g
What happened when 6.0M HCl was added to the contents of the tube in 7a above?
When one mole of benzene (C6H6) undergoes complete combustion, 3,170 kJ are released. Calculate the combustion energy of 0.350 kg of benzene?
Why was acetone added to the reaction mixture only after we briefly mixed the catalyst and the behzaldehyde? 3. Why doesn't the dibenzalacetone product react (via the aldol condensation pathway) with the excess benzaldehyde in the reaction mixture..
How many grams of water can be cooled from 34°C to 26°C by the evaporation of 81 g of water? (The heat of vaporization of water in this temperature range is 2.4 kJ/g. The specific heat of water is 4.18 J/g·K.)
Compute the number of gms of CoCl2 that would be needed to prepare the solutions:(a) 550 mL of a 1.75 M solution (b) 210 mL of a 0.0180 M solution.
Calculate the molarity of an aqueous NaOH solution if 30.10ml of .500M H2SO4 is required to reach the end point when titrated against 10.00mL of NaOH solution.
A volume of 80.0 ml of H2O is initially at room temperature (22.0 C). A chilled steel rod at 2.00 C is placed in the water. If the final temperature of the system is 21.1 C , what is the mass of the steel bar?
Suppose the reaction Ca3(PO4)2 + 3H2SO4 ------ > 3CaSO4 + 2H3PO4 is carried out starting with 103 g of Ca3(PO4)2 and 33.7 g of H2SO4. How much phosphoric acid (H3PO4) will be produced?
Compute the solubility of silver sulfite, Ag 2 SO 3 in units of grams per liter and complete and balance these given redox equations by the half reactions method (the oxidation reaction and the reduction reaction)
Suppose that you have a 2.0 L sample of hydrogen at 1.00 atm and 59°C. If you heat the sample to 84°C and it expands to a volume of 3.7 L, what will the final pressure be?
What was the wavelength of the second photon emitted?
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