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What volume will 10 L of gas at 450 torr occupy if the pressure is increased to 910 torr at constant temperature
1. Draw the structure of the tripeptide alanyl-glutamyl-glycine (AEG).
2. Differentiate primary, secondary and tertiary structures of protein.
3. What forces of attraction hold the subunits in a quaternary structure?
What is the net average charge on the predominant form of lysine at pH values of (a) 2.0, (b) 5.0
and (c) 7.0? CLUE: draw the structure of lysine and show its different charged forms; then
consider in which pH domains the pKa values for deprotonation/protonation occur.
Our body is compost of about 70% water which means that majority of the chemical processes
happens in aqueous medium. Of the residues of the following amino acids: methionine, histidine,
arginine, phenylalanine, valine, glutamine and glutamic acid, which would you expect to find
a. on the surface of a protein
b. in the interior
The use of hydrofluoric acid for etching and frosting of glass is based on the fact that it attacks glass, silicon dioxide. Silicon tetrafluoride and water are produced.
SiO2 + 4 HF → SiF4 + 2 H2O
a. Write the mode of action.
b. Calculate the number of moles of hydrofluoric acid would completely react with 2.5 moles of silicon dioxide
c. what type of chemical reaction?
N2(g) + 3H2(g) → 2NH3(g) ∆H= -91.8 kJ
N2(g) + 4H2(g) + Cl2(g) → 2NH4Cl(s) ∆H= -628.8 kJ
NH3(g) + HCl(g) → NH4Cl(s) ∆H= -176.2 kJ
23.50
for the reaction of magnesium and HCL if you react 25 grams of magnesium with 37 grams of Hcl which is reactant is the limiting reactant and how much MgCl2 will be produced by the reaction?
calculate the pH of 0.1 mol/L Sodium hydroxide(NaOH) with a Kb value= 36.
