Environmental Chemistry Part II: Water

Question 1

water covers ____ of earth’s crust?
fresh water is only _____.

Answer 1

71%
0.2%

Question 2

why is sea water not fit for drinking?

Answer 2

large amount of salts

Question 3

importance of water in body and household?

Question 4

importance of water in industry and agriculture.

Question 5

basic properties of water?

Question 6

explain the peculiar behavior of water & its importance?

Question 7

why is water an excellent cooler in industries?

Question 8

water has _____ heat of vaporization. meaning? importance?

Question 9

how can u split water?
at which electrode H and O is produced? reaction? ratio?

Question 10

the ability of water to dissolve a wide variety of substances is due to?
why is natural water like rainwater and ground water no pure water?

Answer 10

its 2 properties

Question 11

what is soft and hard water?

Question 12

rainwater dissolve CO2? what happens after that? write reactions? some rocks may contain?

Question 13

list subtances that causes hardness of water?

Question 14

hard water is divided into? explain? what is it caused by?

Question 15

how does hard water hamper cleansing action? solution to it?

Question 16

methods to remove temporary hardness?
discuss the 1st method & write the reaction?

Question 17

clark’s method

Question 18

methods to remove permanent hardness? explain the first method?

Question 19

ion exchange resins?

Question 20

solve self assessment exercise 15.4

Question 21

what causes contamination in water bodies?

Question 22

describe household wastes as pollutants? write names of 6 household wastes?

Question 23

describe industrial wastes as pollutants?

Question 24

raw water treatment

Question 25

sewage water treatment?

Question 26

cholera? caused by? symptoms?

Question 27

dysentery? caused by? symptoms

Question 28

juandice? it leads to?

Question 29

hepatitis? causes

Question 30

typhoid? how does it spread? characterized by?