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? ”

If temperature increases then the rate increases because energy of the particles increases.

If surface area increases then the rate increases because more contact of molecules is possible.

Explanation:

Temperature : Increasing the temperature means more reactant molecules will have sufficient energies to cross the energy barrier and thus the number of effective collisions increases, thus leading to more products and increased rate of reaction.

Surface area of the reactants: If the reactants are present in smaller size, more reactants can react as decreasing the size increases the surface area of the reactants which will enhance the contact of molecules.Hence, more products will form leading to increased rate of reaction.

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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the area between the graph and the t axis