Consider the intermediate chemical reactions.
ca(s) + co2(g) + o2(g) - cacos(s) ah, = -812.8 kj
2 ca(s)+ o2(g) → 2cao(s)
ah, = - 1,269.8kj
the final overall chemical equation is cao(s) + co2(g) → caco3(s). when the enthalpy of this overall chemical equation is
calculated, the enthalpy of the second intermediate equation
is halved and has its sign changed.
is halved.
has its sign changed.
is unchanged.

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

In the reaction between a crushed antacid tablet and vinegar what gas is emitted

What is the main reason why some developing countries fear the increase the free trade policies around the world?