Which of the following will influence the rate of a chemical reaction?

Experiment # 4 “Preparation and Properties of Oxygen” Which of the following is the source for oxygen according to experiment 4?  

Demonstration # 2 “Chemical Reactions” Suppose two colorless solutions are mixed and an orange solid is produced. Which of the following is the best explanation for this observation?

What is the effect of the surface area on the rate of reactions?

Lab # 6 “Chemical Reactions” Which equation represents a combination reaction? 

Atmospheric pressure at sea level is 760 mm Hg (760 torr) while atmospheric pressure in Cedar City is 617 mm Hg.  This indicates that: 

Lab # 8 “Chemical Equilibrium” What is meant by a “reversible reaction”?

What is the apparatus shown below called?

Demonstration # 5 “Polymers” What is the process of making polymer called?

Experiment # 1 “Safety in the Lab” Which one of the following is unacceptable laboratory attire?