Water 🧪

Question 1

What happens in stage one of water purification?

Answer 1

Aluminum sulphate Al2(SO4)3 is added to remove microbes and pathogens and dead organisms so they settle at the bottom. Aluminium sulphate is a coagulant

Question 2

What happens in stage two of water purification?

Answer 2

I’m sedimentation, sand, small stones, twigs etc. are all collected and settle down

Question 3

What happens in stage three of water purification?

Answer 3

All the remaining insoluble particles are removed in the filtration process

Question 4

What happens in stage four of water purification?

Answer 4

Chlorine is added as a disinfectant to kill germs, bacteria, etc.

Question 5

What happens in stage five of water purification?

Answer 5

Water is stored in a reservoir

Question 6

What are the 6 stages of water purification?

Answer 6

Water intake
Coagulation
Sedimentation
Filtration
Disinfection
Storage

Question 7

What is the ratio of water

Answer 7

2:1

Question 8

What is waters BP?

Answer 8

100 degrees centigrade

Question 9

What is the freezing point for water?

Answer 9

0 degrees

Question 10

What is the physical test for pure water?

Answer 10

Boil and check temp
Freeze it at 0 degrees

Question 11

What is the chemical test for water?

Answer 11

Add CuSO4 (anhydrous) white -> blue
Add CoCl2 (anhydrous) blue -> dark pink

Question 12

What group of metals all react with H2O at room temp?

Answer 12

Group 1

Question 13

What metals react with steam?

Answer 13

Mg
Al
Fe
Zn
Sn (tin)

Question 14

What metals have no reaction with H2O?

Answer 14

Pt
Au (gold)
Ag (silver)
Cu

Question 15

When CuSO4 • H2O is heated what is visible?

Answer 15

Colour change blue to white
Water droplets visible on test tube