Water and Water Treatment

IGCSE Chemistry 0620
Topic 3 Chemistry of our Environment - WATER
18 September 2023
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ChemistrySecondary EducationAge 12,13

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IGCSE Chemistry 0620
Topic 3 Chemistry of our Environment - WATER
18 September 2023

Slide 1 - Diapositive


Describe how you feel right now 
using an emoji.
😒🙁😐🙂😃

Slide 2 - Sondage

  • state that water from natural sources may contain substances, including:
  • (a) dissolved oxygen
  • (b) metal compounds
  • (c) plastics
  • (d) sewage
  • (e) harmful microbes
  • (f) nitrates from fertilisers
  • (g) phosphates from fertilisers and detergents"  
I intend to:
18 September 2023, Monday

Slide 3 - Diapositive

  • state that some of these substances are beneficial, including:
  • (a) dissolved oxygen for aquatic life
  • (b) some metal compounds provide essential minerals for life  
I intend to:
18 September 2023, Monday

Slide 4 - Diapositive

  • state that some of these substances are potentially harmful, including:
  • (a) some metal compounds are toxic
  • (b) some plastics harm aquatic life
  • (c) sewage contains harmful microbes that cause disease
  • (d) nitrates and phosphates lead to deoxygenation of water and damage to aquatic life
  • details of the eutrophication process are not required"  
I intend to:
18 September 2023, Monday

Slide 5 - Diapositive

  • describe the treatment of the domestic water supply in terms of:
  • (a) sedimentation and filtration to remove solids
  • (b) use of carbon to remove tastes and odours
  • (c) chlorination to kill microbes"  
I intend to:
18 September 2023, Monday

Slide 6 - Diapositive

  • state that ammonium salts and nitrates are used as fertilisers  
  • describe the use of NPK fertilisers to provide the elements nitrogen, phosphorus and potassium for improved plant growth  
I intend to:
18 September 2023, Monday

Slide 7 - Diapositive

IGCSE Chemistry 0620
Topic 3 Chemistry of our Environment - WATER
18 September 2023

Slide 8 - Diapositive

  • 🜛 Present the collab output about the purity of water
Retrieval Activity
timer
2:00
18 September 2023, Monday

Slide 9 - Diapositive

IGCSE Chemistry 0620
Topic 3 Chemistry of our Environment - WATER
18 September 2023

Slide 10 - Diapositive

  • Are all impurities found in water harmful to animals and humans?
A question that matters! 
13 September 2023, Wednesday

Slide 11 - Diapositive

IGCSE Chemistry 0620
Topic 3 Chemistry of our Environment - WATER
18 September 2023

Slide 12 - Diapositive

Classwork 6
Chemical Tests for and Purity of Water
timer
15:00
18 September 2023, Monday

Slide 13 - Diapositive

Uses of Water
  • Domestic uses: for drinking, cooking, gardening, and general sanitation 
  • Agricultural uses: as a drink for animals and watering crops
  • Industrial uses: as a solvent, as a coolant and heated to make steam used to generate electricity
18 September 2023, Monday

Slide 14 - Diapositive

Sources of water
  • lakes
  • rivers
  • underground water sources (groundwater)
  • A rock that stores water is known as an aquifer
18 September 2023, Monday

Slide 15 - Diapositive

Substances dissolved in water
  • Dissolved oxygen
  • Metal compounds
  • Plastics
  • Sewage
  • Harmful microbes
  • Nitrates from fertilisers
  • Phosphates from fertilisers and detergents
18 September 2023, Monday

Slide 16 - Diapositive

QUESTION
  • What causes these substances to be dissolved in natural water?
  • Is water from a natural source safe to consume?

18 September 2023, Monday

Slide 17 - Diapositive

IGCSE Chemistry 0620
Topic 3 Chemistry of our Environment - WATER
18 September 2023

Slide 18 - Diapositive

Beneficial substances
  • Dissolved oxygen - essential for aquatic life
  • Metal compounds - some provide essential minerals which are necessary for life, such as calcium and magnesium
18 September 2023, Monday

Slide 19 - Diapositive

Potentially harmful substances 
  • Metal compounds - some are toxic like aluminium and lead
  • Some plastics - may be harmful to aquatic life in many ways, e.g. getting trapped in plastic waste, dying of starvation as their stomach is filled with plastic
  • Sewage - contains harmful microbes which can cause disease 
  • Nitrate & phosphates from fertilisers - these can promote the growth of aquatic plant life which leads to deoxygenation of water. Ultimately, this can cause damage to aquatic life in a process called eutrophication (you do not need to know the details of this process)
18 September 2023, Monday

Slide 20 - Diapositive

Potentially harmful substances 
  • Metal compounds can be both beneficial and harmful, it depends on the metal within the compound, e.g. calcium, magnesium, potassium and sodium are all metals which are essential for life. Harmful metals include lead, arsenic and mercury. ☠️
18 September 2023, Monday

Slide 21 - Diapositive

Collab Work
Purification of Domestic Water
timer
15:00
18 September 2023, Monday

Slide 22 - Diapositive

IGCSE Chemistry 0620
Topic 3 Chemistry of our Environment - 
AIR QUALITY AND CLIMATE CHANGE
18 September 2023

Slide 23 - Diapositive

Oral Presentation
18 September 2023, Wednesday
TOPICS
  • Patheany - Composition of air and air pollution, page 327
  • Sokharita - Sulfur dioxide, page 328
  • Molvinnika - Oxides of Nitrogen, page 329
  • Viya - Carbon monoxide, page 330
  • Chanthonary - Particulates, page 331

Slide 24 - Diapositive

Oral Presentation
18 September 2023, Wednesday
TOPICS
  • Puthesak - Greenhouse gases, page 331 and Greenhouse effect, page 332
  • Kimhouy - Global warming, page 331
  • Solita - Climate change, page 332
  • Rithya - Reducing the amount of carbon dioxide released into the atmosphere, page 333
  • Jade - Reducing the amount of methane released into the atmosphere, page 334

Slide 25 - Diapositive

Oral Presentation
18 September 2023, Wednesday
TOPICS
  • Vitou - Ponna - Composition of air and air pollution, page 327
  • Kimmeng - Vennessa - Sulfur dioxide, page 328
  • Moni - Neath - Oxides of Nitrogen, page 329
  • Cola - Yali - Carbon monoxide, page 330
  • Ryan - Darady - Particulates, page 331

Slide 26 - Diapositive

Oral Presentation
18 September 2023, Wednesday
TOPICS
  • Kimsuor - Keriya - Greenhouse gases, page 331 and Greenhouse effect, page 332
  • David - Kateka - Global warming, page 331
  • Kiet - Nich - Climate change, page 332
  • Phimean - Korng - Reducing the amount of carbon dioxide released into the atmosphere, page 333
  • Prasidh - Nalin - Reducing the amount of methane released into the atmosphere, page 333/4

Slide 27 - Diapositive

IGCSE Chemistry 0620
Topic 3 Chemistry of our Environment
13 September 2023

Slide 28 - Diapositive

Water Treatment Project
18 September 2023, Wednesday
Stages (Ref: page 337)

  • Team 1 - Purification (Screening)
  • Team 2 - Sedimentation
  • Team 3 - Filtration (through fine sand)
  • Team 4 - Chemical absorption (by activated carbon)
  • Team 5 - Disinfection

Slide 29 - Diapositive

Water Treatment
13 September 2023, Wednesday

Slide 30 - Diapositive

Water Treatment
13 September 2023, Wednesday
Stages (Ref: page 337)

  • Purification (Screening)
  • Sedimentation
  • Filtration (through fine sand)
  • Chemical absorption (by activated carbon)
  • Disinfection

Slide 31 - Diapositive

Self-Assessment for Learning
11 September 2023, Monday
T O  D O:
  • Identify two ideas you do not understand quite well in our sessions.
  • Ask someone who can explain and write the explanations in your notebook.
  • Verify your learning from a classmate by sharing it with the teacher.
timer
5:00
Week 07 Reflection 1:

Slide 32 - Diapositive


Why does a car tire explode 
when the temperature increases?

Slide 33 - Question ouverte