Question

units such as parts per million (ppm) or parts per billion (ppb) are used to express ____________ concentrations of solutes.
undetectable
moderately high
very low
very high
question 8
1 pts
percentage, like units such as parts per million (ppm) or parts per billion (ppb) can be thought of as \____________\.
part per one hundred thousand
part per thousand
fractions
part per hundred

Explanation:

1. Parts - per - million (ppm) and parts - per - billion (ppb) are used for very low solute concentrations. For example, 1 ppm means 1 part of solute in 1 million parts of the solution, which is a very small amount.
2. Percentage is a part - per - hundred (1% = 1 part per 100). Similarly, ppm and ppb are also fractional units. ppm is like a part - per - million and ppb is a part - per - billion. They are all types of fractions representing the ratio of solute to the total solution.

Answer:

Question 1: C. very low
Question 2: C. fractions