Chemistry, 20.02.2020 20:01 pacpac1172
In very early human history, complex sanitation systems were not needed because settlements were usually very small, like the village below. However, as cities became larger and population densities increased, one major advancement was the development of which helped to channel waste waters away from human populations more effectively than in the past
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Chemistry, 21.06.2019 22:30, 20alondra04
In order to calculate the amount of heat transferred you must know the __ and specific heat of the material, as well as the change in temperature. a. volume b. density c. mass d. enthalpy
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Chemistry, 21.06.2019 22:30, aubreykenzie686
Naoki's bicycle has a mass of 10 kg. if naoki sits on her bicycle and starts pedaling with a force of 168 n, causing an acceleration of 2.8 m/s2, what is naoki's mass?
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Chemistry, 22.06.2019 16:50, Pookiev
Which of the following is an indication that a substance has undergone a chemical change? a. no new product has been formed. b. the color of the substance has not changed. c. the original constitute has not changed. d. the molecular structure has changed.
Answers: 1
In very early human history, complex sanitation systems were not needed because settlements were usu...
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