Why is the chlorine that is added to final,treated waste water allowed to get used up
before it is discharged into a river or lake?

Answers

Answer 1

Answer:

Chlorine is used as a disinfectant to wastewater treatment plants. The addition of chlorine to the final treated water is because to make sure that some of the microorganisms not killed during treatment is eliminated. It is consumed before it is released to the environment to ensure that microorganisms and other marine life are not killed in the process too.

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Scientists classify rocks into three different types. What is the main basis for the classification system they chose?

Answers

Answer:

The main basis for the classification system is the way rocks were formed. With these criteria there are three different types of rocks:

Igneous rocks : formed through the cooling and solidification of magma or lava

Sedimentary rocks : formed by the accumulation or deposition of small particles

Metamorphic rocks: formed by the transformation of existing rock types by heating and pressure

1. color of the rock
2. shape of the rock
3. how the rock is formed
4. who discovered the rock
that is it

You've just solved a problem and the answer is the mass of an electron, me=9.11×10−31kilograms. How would you enter this number into the answer box?

Answers

That depends on how the program is designed. It could be something like 9.11*10^-31 kg

How does meiosis I differ from meiosis II

Answers

Meiosis 1 makes 2 Haploid cells from one Diploid cell. Meiosis 2 separates the sister chromatids in the haploid cell in order to make 4 daughter cells.

What is the mass, in grams, of 1.50×1021 molecules of aspirin, C9H8O4?Express your answer using three significant figures.

Answers

Answer: m = 0.448 g C9H8O4

Explanation: Solution attached

Convert molecules of C9H8O4 to moles using the Avogadro's number

Convert moles of C9H8O4 to mass using its molar mass.

5.The synthetic polymer which can be used as a substitute for wool for making sweaters and shawls isa. Nylon b. polyester c. terylene d. acrylic

Answers

Answer:

D. Acrylic is a substitute wool

Laurie buys four bags of candy with 10 pieces in them, Her Dad gives her 5 more pieces of candy. Laurie wants to give candy to her six friends, How much candy is left over?