IStoichiometry Worksheet 1. Silver sulfide (Ag2S) is the common tarnish on silver objects. What mass of silver
sulfide can be made from 1.23 g of hydrogen sulfide (H2S) obtained from a rotten
egg? The reaction of formation of silver sulfide is given below:
4Ag(s) + 2H2S(g) + O2(g) – 2Ag S(s) + 2H2O(1) (Equation must first be
balanced.)
Reaction type _4Ag(s) + 2H2S(g) + O2(g)
Formula to solve
Balanced equation
Solve
Answer

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

3. how much energy in joules is required to evaporate .0005 kg of liquid ammonia to vapor at the same temperature? 4. how much energy ( in megajoules ) is given up by .75 kg of water at 0c when it freezes to form ice at 0c? 5. explain how heat works between and at critical temperatures?

Why dose heating increase the speed at which a solution dissolved in water