Question

1. The thermite reaction is performed using 8.6g Fe2O3 and 1.8g powdered Al metal/

a. Which reactant is the excess?

b. How many grams of excess reactant are left over?

c. How many grams of aluminum oxide can be produced?

2. The reaction of 5.0g of CuSo4 with excess sodium hydroxide produced 2.6g of Cu(OH)2. What percent yield of Cu(OH)2 was obtained?

3. Approximately 46.4 grams of sodium acetate (82.0 gm/mol) will dissolve in 100 grams of water at 20 degrees Celcius. If 2.75 mol NaCH3COO is dissolved in 355 g of water, the solution will be:

A. dilute

B. concentrated

C. saturated

D. supersaturated

4. Answer the following as true or false:

A. NaCl(aq) has a greater surface tension from H20

B. CH4 is more polarizable than CBr4

C. C12H6 is more viscous than C5H12

D. Compared to methanol, Bromine is more soluble in hexane.

E. Water rises in a capillary tube due to the fact that cohesive forces between the water molecules are stronger than the adhesive forces between water and the glass.