Write a hypothesis about the effect of temperature and surface area on the rate of chemical reactions using this format: “if . . then . . because. . ” be sure to answer the lesson question, “how do the factors of temperature and surface area affect the rate of chemical reactions? ”

Assume that a person skiing high in the mountains at an altitude of h = 15100 ft takes in the same volume of air with each breath as she does while walking at sea level. determine the ratio of the mass of oxygen inhaled for each breath at this high altitude compared to that at sea level. assume that the air composition (i.e. % of air that is oxygen) is the same at sea level as it is at 15100 ft.

The built in flash in a compact camera is usally capable of giving correct exsposure for distance up to how many meters?

Aforklift raises a box above the floor and does 2,000 j of work. if the forklift motor consumes 3,000 j of electrical energy from the battery to raise the box, what is the efficiency of the lift?