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Given the following pKa values, draw the dipeptide at pH7. Clearly show and explain the charges in this molecule. (pka values 2.3 for -COOH, 9.6 for -NH2 group, 10 for tyrosine side chain and 9.0 for serine side chain)
What is the overall charge of the dipeptide in question above?
What are the partial pressures of N2 and H2O. A miniature volanco can be made in the laboratory with ammonium dichromate. When ignited, it decomposes in a fiery display. (NH4)2Cr2O7(s)
Mass of nitrogen, Suppose 5.0 liters of Nitrogen (diatomic) is at a temperature of 40 degrees C and a pressure of 1.5 ATM
You carefully weigh out 20.00 g of CaCO_3 powder and add it to 81.00 g of HCL solution. You notice bubbles as a reaction takes place. You then weigh the resulting solution and find that it has a mass of 92.80 g . The relevant equation is
What substances are present after the reaction is over? (Hint: Write a balanced chemical equation for the reaction first.) How many grams of water are formed?
Write a balance chemical reaction showing that Ru2+ disproportionates in aqueous acid. calculate standard potential and the Gibbs Free Energy for the reaction.
To determine [Fe3+] in an unknown solution, 1.00 mL of the solution was diluted to 50.0 mL. After addition of excess SCN-, the absorption of the standard solution =0.193 at 580 nm. What is the [Fe3+]
Give the formula of a compound that contains a secondary hydrogen and Give the formula of a compound that is a secondary alcohol
What is the total pressure in a 25.0 L flask 20.0°C, which contains 0.127 moles of H2 and 0.288 moles of N2?
for the reaction 2CH3CH2CH2CH3(g) + 13O2 --> 9CO2(g) +10H2O(g) delta h = -5285.0 kJ. a) how many kilojoules are released when 27.86 g of butane are burne? Assume that an excess of oxygen is present.
If you have a sample of 2.5 mol of Fe2(SO4)3, how many mol of sulfate ion do you have
How many moles of Cl2 can be produced from the given mass of MnO2. How many moles of Cl2 can be produced from the given mass of HCl
Calculate the pH of a solution made up from 2.2 g of potassium hydroxide dissolved in 146 mL of 0.16 M perchloric acid. Assume the change in volume due to adding potassium hydroxide is negligible.
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