Water

• Chemistry
• Secondary Education
• Age 12,13

Topic Assessment 1

States of Matter

13 September 2023, Wednesday

IGCSE Chemistry 0620

Topic 3 Chemistry of our Environment

13 September 2023

Describe how you feel right now 

using an emoji.

😒🙁😐🙂😃

• describe chemical tests for the presence of water using anhydrous cobalt (II)chloride and anhydrous copper (II) sulfate  
• describe how to test for the purity of water using melting point and boiling point  
• explain that distilled water is used in practical chemistry rather than tap water because it contains fewer chemical impurities  

I intend to:

13 September 2023, Wednesday

IGCSE Chemistry 0620

Topic 3 Chemistry of our Environment

13 September 2023

• What do you know about water?
• What kind of water do you drink at home?
• Is water important to you? 

Retrieval Activity

13 September 2023, Wednesday

IGCSE Chemistry 0620

Topic 3 Chemistry of our Environment

13 September 2023

• Does an impurity affect the boiling point of water? 

A question that matters! 

13 September 2023, Wednesday

IGCSE Chemistry 0620

Topic 3 Chemistry of our Environment

13 September 2023

Key Concept

Anhydrous vs. Hydrated

• Anhydrous — NO water
• Hydrated — WITH water

13 September 2023, Wednesday

Key Concept

Chemical Tests for the Presence of Water 

• Cobalt (II) chloride test — using anhydrous CoCl2
• Copper (II) sulfate test — using anhydrous CuSO4

13 September 2023, Wednesday

Investigation 01

Chemical Tests for Water

11 September 2023, Monday

Processing

13 September 2023, Wednesday

• Cobalt (II) chloride test — using anhydrous CoCl2

• CoCl2 (s) + 6 H2O (l)  ⇋  CoCl2 . 6 H2O (s)

Processing

13 September 2023, Wednesday

• Copper (II) sulfate test — using anhydrous CuSO4

• CuSO4 (s) + 5 H2O (l)  ⇋  CuSO4 . 5 H2O (s)

IGCSE Chemistry 0620

Topic 3 Chemistry of our Environment

13 September 2023

Investigation 02

Test for the Purity of Water

11 September 2023, Monday

Key Concept

Purity Tests for Water and Pure Substances

• Using melting point 
• Using boiling point 

13 September 2023, Wednesday

Processing

13 September 2023, Wednesday

• Impurities tend to increase the boiling point of water, so impure water will boil at temperatures above 100 oC.
• Impurities tend to decrease the melting point of water, so impure water will melt at temperatures below 0 oC.

IGCSE Chemistry 0620

Topic 3 Chemistry of our Environment

13 September 2023

Water Treatment

13 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

Creative Construction

Water Treatment Prototype

13 September 2023, Wednesday

GOAL:

• Build a prototype of a water treatment system using available resources.
• Invent a low-cost prototype that may be used by people who live in the far-flung areas of Cambodia

IGCSE Chemistry 0620

Topic 3 Chemistry of our Environment

13 September 2023

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 06 Reflection 2:

Why does a car tire explode 

when the temperature increases?