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Which of the following substances is an element? a. carbon (c) b. water (h2o) c. methane (ch4) d. brass (cu + zn)
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Transportation is the largest single source of air pollution in the united states. air pollution can harm the environment and human health. which technology could offer a solution to this problem? mufflers that reduce noise motors that run on electricity tires that improve gas mileage
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When a spring is compressed, the energy changes from kinetic to potential. which best describes what is causing this change?
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The diagram below shows the movement of particles. what does this piece of evidence best support? the collision theory the maxwell-boltzmann distribution the effect of pressure on reaction rates the effect of temperature on reaction rates
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Which of the following substances is an element? a. carbon (c) b. water (h2o) c. methane (ch4) d. b...
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