All life on earth is based on one of many two-polymer systems, each made up of a protein and a nucleic acid. in a cell, these polymers are, for the most part, charge-balanced, with the nucleic acid in any pair carrying a negative charge and the protein carrying an equal amount of positive charge. consider a distribution of eight of these polymers, where the eight proteins sit together near the center of the cell and the nucleic acids are spread out along the circumference of a circle with the radius equal to one-quarter of the cell diameter, centered on the proteins. part a: - if seven of the eight nucleic acids are at ? /2, 3? /4, ? , 5? /4, 3? /2, 7? /4, and 2? rad, where on the circle must you place the eighth acid to give the system a balanced charge distribution? (hint: begin by making a sketch.)

if seven of the eight nucleic acids are at , , , , , , and , where on the circle must you place the eighth acid to give the system a balanced charge distribution? (hint: begin by making a sketch.)

1) at 3? rad
2) at ? /4 rad
3) at ? /8 rad
4) at ? /3 rad

1. calculate the approximate enthalpy of the reaction in joules. estimate that 1.0 ml of vinegar has the same thermal mass as 1.0 ml of water. iqnore the thermal mass of th sodium bicarbonate. note: it takes about 4.2 joules () to change 1.0 gram (1.0ml) of water 1.0 c

The density of an unknown gas at 98°c and 740 mmhg is 2.50 g/l. what is the molar mass of the gas with work showed?

Part b: study of equilibrium on solubility: mg(oh)2(s) ⇌ mg2+(aq) + 2 oh–(aq) cloudy clear (pink) 7. a. b. 8. a. b. 9. 10. 11. 12. when adding concentrated hydrochloric acid, how did the appearance of the equilibrium mixture change? the change in appearance indicated a shift in the point of equilibrium. in which direction did the equilibrium shift? (l) left (r) right explain your answer to question 7a. you should indicate which ion was added to or removed from the equilibrium mixture. when adding edta, how did the appearance of the equilibrium mixture change? the change in appearance indicated a shift in the point of equilibrium. in which direction did the equilibrium shift? (l) left (r) right explain your answer to question 8a. you should indicate which ion was added to or removed from the equilibrium mixture. upon heating in which direction is the equilibrium shifting? upon cooling in which direction is the equilibrium shifting? is the forward reaction a. endothermic explain your answers to questions 9, 10, and 11. (l) left (r) right (l) left (r) right b. exothermic