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The activity of an enzyme is close to zero at pH = 10 and above and high at pH = 6 and below. The activity of this protein probably depends upon the presence of an amino acid with R-group: A. that has a pKR = 8 and must be protonated for activity. B. that has a pKR = 6 and must be unprotonated for activity. C. that has a pKR = 10 and must be protonated for activity. D. that has a pKR = 4 and must be protonated for activity. E. that has a pKR = 8 and must be unprotonated for activity.
Joe makes up a aqueous solution of a copper salt from some ore samples he has found in Contact, NV. He places a rod of pure copper into the solution making a cathode and uses a graphite rod as an anode
Assuming the heat absorbed by the styrofoam is negligible, calculate the expected final temperature. The specific heat of water is 4.184 J g-1 K-1.
Calcium fluoride has a Ksp of 3.9 x 10^-11 at 25 C. What is the fluoride ion concentration at equilibrium
Molecular weight and mole concept : key informaiton, If Aluminum Chloride reacts with Copper II Carbonate and 0.25 moles of Aluminum Chloride are used, how much Copper II
Methane the principal component of natural gas is used is used for heating and cooking. The combustion process is CH4(g) + 2O2(g) -> CO2(g) + 2H2O(l). If 12.1 moles of CH4 react with oxygen, what is the volume of CO2 (in liters) produced at 21.5 d..
a flask contains 30mL of 0.16 M phosphate buffer that has a pH of 7.1. what volume of 0.06M NaOH should be added to increase
A 11.7 mL sample of a HCl solution has a pH of 2.000. What volume of water must be added to change the pH to 4.000?
the equilibrium constant kp for the reactioncog h2og -gt co2g h2gat 986degc is 0.63. a rigid cylinder at that
Based on the given chemical equation, how many grams of aluminum are needed to react with 0.6 moles of hydrochloric acid? Al + HCl yields AlCl3 + H2
a gas has a volume of 5.80 l at o degrees c. what final temperature in degrees celsius is needed to cause the volume of
An iodine solution of unknown molarity was titrated against a 0.001M solution of S2O3^2-. The blue black iodine-starch complex just disappeared when 20.2 mL of thiosulfate was added. What is the exact molarity of the I2 solution.
The sample is placed in a drying dish (weight = 0.5000 g before the sample is added), and then placed in an oven at 104°C until all the moisture is evaporated.
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