1. given the reaction: ca + 2 h2o → ca(oh)2 + h2 how many moles of water are needed to react completely with 2.0 moles of ca?

a. 1.0 moles b. 2.0 moles c. 0.5 moles d. 4.0 moles

2. fe + h2so4 → feso4 + h2 is an example of

a. single displacement b. synthesis c. double displacement d. decomposition

3. hydrazine, n2h4 , and dinitrogen tetroxide, n2o4 react to form gaseous nitrogen and water. which of these represents a properly balanced equation for this reaction?

a. n2h4 +n2o4→ n2 +h2o

b. 2 n2h4 +n2o4 → 2 n2 +4 h2o

c. 2 n2h4 +n2o4 → 3 n2 +4 h2o

d. 2 n2h4 +3 n2o4 → 5 n2 +6 h2o

4. a 40% alcohol contains

a. 40 ml alcohol in 100 ml of water.

b. 40 ml alcohol in 60 ml of water.

c. 60 ml of alcohol in 100 ml of water.

d. 60 ml of alcohol in 40 ml of water.