Which of these statements are true? Select all that apply. The Delta. Hrxn for the reaction C(s) O2(g) Right arrow. CO2(g) is the same as the Delta. Hf for CO2(g). The Delta. Hrxn for the reaction Na(s) Cl2(g) Right arrow. 2NaCl(s) is the same as the Delta. Hf for NaCl(s). The Delta. Hf for Br2(l) is 0 kJ/mol by definition. To determine the Delta. Hf for H2O(g), just reverse the sign of the Delta. Hrxn for the reaction 2H2O(l) Right arrow. 2H2(g) O2(g). The Delta. Hf for N2(l) is 0 kJ/mol by definition. The Delta. Hrxn for the reaction 1. 5H2(g) 0. 5N2(g) Right arrow. NH3(g) is the same as the Delta. Hf for NH3(g).

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

Which radioisotope is used to date fossils? a. oxygen-16 b. carbon-14 c. uranium-238 d. carbon-12

The molar mass of cu is 63.55 g/mol. the number of grams of cu produced in this reaction is