Bài 4.Cho hai nguyên tố A, B đứng kế tiếp nhau trong bảng tuần hoàn và có tổng số đơn vị điện tích hạt nhân là 37. a. A, B thuộc cùng một chu kì hay cùng một nhóm? Xác định ZA ,ZB.

b. Xác định vị trí của A, B trong bảng tuần hoàn. Cho biết A, B là kim loại, phi kim, hay khí hiếm?

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

Analyze how limestone is weathered and identify the features that are formed as a result of this dissolution

Acetylene gas c2h2 undergoes combustion to produce carbon dioxide and water vapor how many grams of water are produced by the same amount of c2h2?