Given four chemical bonds, C―Si C=C C≡N C=N Determine if each of the statement is True or False. 1) There are three bonding pairs between C and N in a C≡N bond. 2) The C=O bond is stronger than the C=N bond because O is larger than N. 3) The order of increasing bond length is: C≡N < C=N < C=C < C―Si. 4) The only reason that the C=C bond is shorter than the C―Si bond is that a C atom is smaller than a Si atom.

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

All of the following are part of the biosphere except

What are the similarities of physical and chemical change ?