10.1

Water

13 flashcards to master Water

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Key Concept Flip

What chemical is used to test for the presence of water?

Answer Flip

Anhydrous cobalt(II) chloride or anhydrous copper(II) sulfate are used. Anhydrous means the chemical has no water molecules. Remember to specify anhydrous.

Key Concept Flip

What is the colour change observed when using anhydrous cobalt(II) chloride to test for water?

Answer Flip

Anhydrous cobalt(II) chloride changes from blue to pink in the presence of water. Cobalt chloride paper can also be used which also turns from blue to pink.

Key Concept Flip

What is the colour change observed when using anhydrous copper(II) sulfate to test for water?

Answer Flip

Anhydrous copper(II) sulfate changes from white to blue in the presence of water.

Key Concept Flip

How can the purity of water be tested?

Answer Flip

By measuring its melting point and boiling point. Pure water boils at exactly 100°C and melts at exactly 0°C. Any impurities will change these values.

Key Concept Flip

Why is distilled water used in practical chemistry?

Answer Flip

Distilled water contains fewer chemical impurities than tap water. These impurities can interfere with experiments and give inaccurate results.

Key Concept Flip

Name three substances that may be found in water from natural sources.

Answer Flip

Dissolved oxygen, metal compounds, plastics, sewage, harmful microbes, nitrates from fertilizers, phosphates from fertilizers and detergents are all possibilities. Any three are acceptable.

Key Concept Flip

Give one reason dissolved oxygen is beneficial in natural water sources.

Answer Flip

Dissolved oxygen is essential for aquatic life (fish, plants, etc.) to survive.

Key Concept Flip

Give one reason metal compounds are beneficial in natural water sources.

Answer Flip

Some metal compounds provide essential minerals necessary for life.

Example: iron is needed for healthy blood.
Key Concept Flip

Give an example of a potentially harmful substance found in natural water sources.

Answer Flip

Some metal compounds are toxic. Sewage contains harmful microbes which cause disease. Plastics can harm aquatic life. Nitrates and phosphates lead to deoxygenation of water, harming aquatic life.

Key Concept Flip

Outline the process of sedimentation in water treatment.

Answer Flip

Sedimentation involves allowing solid particles to settle to the bottom of the water due to gravity. This removes larger insoluble impurities.

Key Concept Flip

Outline the process of filtration in water treatment.

Answer Flip

Filtration involves passing the water through a filter (

Example: sand) to remove any remaining solid particles that did not settle during sedimentation.
Key Concept Flip

What is the purpose of using carbon in water treatment?

Answer Flip

Carbon is used to remove tastes and odours from the water. It absorbs the chemicals causing these problems.

Key Concept Flip

What is the purpose of chlorination in water treatment?

Answer Flip

Chlorination involves adding chlorine to the water to kill any remaining microbes (bacteria, viruses) and make the water safe to drink.

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9.5 Corrosion 10.2 Air and air quality

About Water (10.1)

These 13 flashcards cover everything you need to know about Water for your Cambridge IGCSE Chemistry (0620) exam. Each card is designed based on the official syllabus requirements.

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