A sample of river water taken near a factory shows pH 5. Does this represent a pollution problem?

Yes because a pH below 7 is acidic and that means that there is pollution

answer by yourhope:

how do models compare to real-world objects?

d. most models represent a real-world object in a simpler way.

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the atomic number of carbon is six, which means that a carbon atom has six protons. carbon has three naturally occurring isotopes: carbon-12, carbon-13, and carbon-14. which of these statements are true about carbon and its isotopes? select all that appl