11. A. Balance the following chemical reaction.
H2 (g) + 12 (g) + heat → HI(g) AG = +237
B. Is the reaction endothermic or exothermic? Why?
C. Is the reaction spontaneous? Why?
D. What type of reaction is this? (Synthesis, Decomposition, or Exchange)

Which of the following statements is true? a. elements in the last period are radioactive. b. atomic weight is the same as atomic mass. c. elements in the same group have the same number of electron shells. d. atomic number equals the number of neutrons in the nucleus of an atom.

14. many depressants reduce small muscle control, making it harder for a. you to steer b. your mind to consider complex problems c. the eye to scan, focus, or stay still d. the kidneys to filter alcohol out of the bloodstream

1. explain hydrogen peroxide, h 2 o 2 properties and decomposition reaction. 2. describe how each of the following natural cycles plays a part in earth’s climate system. (a) the water cycle (b) the carbon cycle