Question

6. Precipitation reactions are best classified as which type of reaction?(2 points) a. synthesis b. decomposition c. single-displacement d. double displacement 7. Acid-base reactions are best classified as which type of reaction? (2 points) a. synthesis b. decomposition c. single-displacement d. double displacement 8. Circle which observation is not consistent that a chemical reaction is occurring. (2 points) a. solid copper deposits on a piece of aluminum foil when the foil is placed in a blue copper nitrate solution. The blue color of the solution fades. b. liquid ethyl alcohol turns into a solid when placed in a low-temperature freezer. c. a white precipitate forms when solutions of barium nitrate and sodium sulfate are mixed. d. a mixture of sugar and water bubbles when yeasts are added. After several days, the sugar is gone and ethyl alcohol is found in the water. 9. Consider the generic reaction: 2 A + 3 B + 2D A reaction mixture contains 6 mol A; 8 mol B; and 10 mol C. What is the limiting reactant? Show your calculations. (4 points) a. A b. B c. C d. D

Answer 1

precipitation reactions 6 Precipitations best classified as double displacement are As in most of double diss- action lead of compounds lead 7 to two inie formation an insoluble product (pred precipitate) for ez 2 Aj Noz (ap + Na, Souley) - war Apa S04 (s) + 2Na Nga at APPL- 2 Ag+ + 2N0 Tap) + 2Na teps + Sou? EW-> A2 Sou (s) ppt + 2Natcap 1200 mg Net comes 242 + + Sou? Ag, Souls tl And -base reaction Hellas & Na on Nall + H₂O & double dis (placement

(6 Chinical reactions involues chemical change. Physical change means change of State (Phase). @ d Goa Al + 3Cu(NO3), (y) → o wa Al. NO) + 6(als, Ba(NO3)2 lay) & Ne, sou (aq) Basou (s) + 2NaNO3 (aq) - сум ти к с Иеои Cathon M Cathoth (s) Phase change. Hince not chanical reaction B.

2 moles with of a reacts Smoles of Bf Imole Co- 6 moles of A will react with 3 x6 - 9 moles of A ONE & 1 x6 & 3 moles of 3 As there is a moles of B & . 10 moles of c. By limiting reagent es excess. 3 moles of B reacts with 2 moles of K & 1 moles of c. mol B will react with 2 x 8= 5.3 mol Art a mol B will react with 3x8 = 2.6 mile. Both are in excess . limiting reagent B.