Water and Water Treatment

• Chemistry
• Secondary Education
• Age 12,13

IGCSE Chemistry 0620

Topic 3 Chemistry of our Environment - WATER

18 September 2023

Describe how you feel right now 

using an emoji.

😒🙁😐🙂😃

• 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

• 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

• 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

• 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

• 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

IGCSE Chemistry 0620

Topic 3 Chemistry of our Environment - WATER

18 September 2023

• 🜛 Present the collab output about the purity of water

Retrieval Activity

18 September 2023, Monday

IGCSE Chemistry 0620

Topic 3 Chemistry of our Environment - WATER

18 September 2023

• Are all impurities found in water harmful to animals and humans?

A question that matters! 

13 September 2023, Wednesday

IGCSE Chemistry 0620

Topic 3 Chemistry of our Environment - WATER

18 September 2023

Classwork 6

Chemical Tests for and Purity of Water

18 September 2023, Monday

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

Sources of water

• lakes
• rivers
• underground water sources (groundwater)
• A rock that stores water is known as an aquifer

18 September 2023, Monday

Substances dissolved in water

• Dissolved oxygen
• Metal compounds
• Plastics
• Sewage
• Harmful microbes
• Nitrates from fertilisers
• Phosphates from fertilisers and detergents

18 September 2023, Monday

QUESTION

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

18 September 2023, Monday

IGCSE Chemistry 0620

Topic 3 Chemistry of our Environment - WATER

18 September 2023

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

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

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

Collab Work

Purification of Domestic Water

18 September 2023, Monday

IGCSE Chemistry 0620

Topic 3 Chemistry of our Environment - 

AIR QUALITY AND CLIMATE CHANGE

18 September 2023

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

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

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

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

IGCSE Chemistry 0620

Topic 3 Chemistry of our Environment

13 September 2023

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

Water Treatment

13 September 2023, Wednesday

Water Treatment

13 September 2023, Wednesday

Stages (Ref: page 337)

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

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.

Week 07 Reflection 1:

Why does a car tire explode 

when the temperature increases?