1. In the reaction N2 + 3H2 -->2NH3, what is the mole ration of nitrogen to ammonia?
A: 1:2
B- 3:1
C- 2:1
D. can not be determined

2. In the unbalanced reaction Al2O3 --> Al + O2, what is the mole ratio of aluminum to oxygen?
A- 4:3
B- 2:3
C- 2:4
D- 3:4

Match each object to its description: a. coma of a comet b. comet tail c. oort cloud haze surrounding a nucleus created by solar wind. hypothetical sphere around the solar system

If a solution is considered basic, then a) the hydroxide ion and hydronium ion concentrations are equal. b) the hydroxide ion concentration is less than the hydronium ion concentration. c) the hydronium ion concentration is greater than the hydroxide ion concentration. d) the hydroxide ion concentration is greater than the hydronium ion concentration.

Which is a chemical property of iron? a. it forms iron oxide (rust) when exposed to moisture and air. b. it is a gray–black metal that is hard to the touch. c. it has a melting point of 2795°f (1536°c). d. it is a good conductor of heat