Chemistry Questions and Answers November 10, 2019

BaCl2 +Na2SO4 = BaSO4(s) + 2Na +2Cl Calculate the mass of the limiting reagent that reacted in the experiment for each trial. Hints: Your limiting reagent is either BaCl2 or Na2SO4 calculate # of moles of your limiting reagent from the mass of your precipitate Trial data: Mass of unknown: 0.999 g Actual mass weighted of Na2SO4: 1.42 g Mass of

The following reaction describes the formation of nickel tetracarbonyl: Ni(s) + CO(g) --> Ni(CO)4(g)? Consider a reaction which produces 12.4 g of nickel tetracarbonyl. a) balance the reaction equation b) Find the number of grams of Ni(s) and CO(g) which reacted.

For each of the following reactions, predict the MAJOR product with correctstereochemistry.

(12 marks) For each of the following reactions, predict the MAJOR product with correct stereochemistry. 4. (a) Br NaSCH3 CH3SH (b) Se(CH3)2 DMF (c) NaOH SH hint product has a S atom in a ring (d) OTs ethanol OTs (e) NaCN acetone (f) CH CI 1eq. NaN3 DMSO I H OH H3 .

Predict the MAJOR product from the following reaction and draw a clear step by-step mechanism for the reaction. Also, briefly explain why this is the major product that is formed

(8 marks) Predict the MAJOR product from the following reaction and draw a clear step bystep mechanism for the reaction. Also, briefly explain why this is the major product that is formed. 1. NH3 OSO2CF3

Which reaction, 1, 2, or 3 in each group, will be either faster or more likely to succeed in forming significant amounts of desired product. Give a brief, but clear and very concise explanation for all your choices.

(8 marks) Which reaction, 1, 2, or 3 in each group, will be either faster or more likely to succeed in forming significant amounts of desired product. Give a brief, but clear and very concise explanation for all your choices. 5. (a) NaCN Reaction 1 Br DMSO CN NaCN Reaction 2 Br CH,CH, CN NaCN Reaction 3 Br H,CH, CN Fastest or most likely Slowest