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identify the elements that correspond to the following atomic numbers. label each as a noble gas ? a halogen ?an alkali metal? an alkaline earth metal? a transition metal? a lanthanide metal? or an actinide metala 17 b 4 c 63 d 72 e 2 f 92 g 55
calculate acidic and basic buffer capacity. How much of strong acid should be added to shift buffer pH one unit down, and how much of the strong base is needed to bring buffer pH one unit up?
buffer that has a pH of 9.80 and an osmotic pressure of 1.04atm at 298 K. What masses of HCN and NaCN should you use to prepare the buffer? mHCN, mNaCN =
The major reason that antiparallel beta-stranded protein structures are more stable than parallel beta-stranded structures is that
The density of a gaseous compound was found to be 1.23 g L-1 at 330 K and 25.5 kPa. What is the molar mass of the compound?
Antimony has two naturally occurring isotopes, Sb-121 (mass = 120.9038 amu) and Sb-123 (mass = 122.9042 amu). Calculate the percent abundances of these isotopes of antimony
How many minutes would be required to electroplate 25g of chromium by passing a constant current of 4.80 amperes through a solution containing CrCl3
The amount of heat needed to raise the temperature of 25 g of a substance by 15°C is 915 J. What is the specific heat of the substance?
460. mL of hydrochloric acid (HCl) acid is exactly neutralized with 485 mL 0.660 M NaOH solution. What is the concentration of the acid solution.
The rate constant for this reaction at 25 degrees C is 4.9 x10-6 L/(mol s) while the rate constant at 35 degrees Cis 1.5 x 10-5 L/(mol s). Use this data to calculate the energy of activation for this reation.
Suppose that the microwave radiation has a wavelength of 10.7 cm. How many photons are required to heat 200. mL of coffee from 25°C to 65°C?
If 15.0 mL of glacial acetic acid (pure HC2H3O2) is diluted to 1.70 L with water, what is the pH of the resulting solution? The density of glacial acetic acid is 1.05 g/mL
Estimate the enthalpy change for the reaction between 1 mol c2h5oh as liquid ethanol, a fuel made by fermenting corn
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