Podcast
Questions and Answers
What is the chemical formula of water and what is its molecular weight?
What is the chemical formula of water and what is its molecular weight?
H2O, 18.02 g/mol
What is the pH of water at 20°C, and what acid-base properties does it exhibit?
What is the pH of water at 20°C, and what acid-base properties does it exhibit?
pH 7, amphoteric (can act as both acid and base)
What percentage of an adult human's body weight is made up of water, and what are some of its essential cellular functions?
What percentage of an adult human's body weight is made up of water, and what are some of its essential cellular functions?
approximately 60%, involved in metabolic reactions, temperature regulation, and waste removal
What percentage of the Earth's surface is covered in water, and how is it distributed?
What percentage of the Earth's surface is covered in water, and how is it distributed?
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What are some of the essential human uses of water, and what are some of its importance in industry and recreation?
What are some of the essential human uses of water, and what are some of its importance in industry and recreation?
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What is the water cycle, and what are the key processes involved in it?
What is the water cycle, and what are the key processes involved in it?
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Study Notes
Physical Properties of Water
- Chemical formula: H2O
- Molecular weight: 18.02 g/mol
- Density: 1 g/cm³ at 20°C
- Boiling point: 100°C at standard atmospheric pressure
- Melting point: 0°C at standard atmospheric pressure
- Solubility: polar solvents, soluble in many substances
Chemical Properties of Water
- pH: neutral (pH 7) at 20°C
- Acid-base properties: amphoteric (can act as both acid and base)
- Reactivity: participates in many chemical reactions, including hydrolysis and oxidation
Biological Importance of Water
- Essential for life: makes up approximately 60% of an adult human's body weight
- Cellular processes: involved in metabolic reactions, temperature regulation, and waste removal
- Photosynthesis: necessary for plant growth and oxygen production
Water in the Environment
- Covers approximately 71% of the Earth's surface
- Distribution: 97% in oceans, 2% in glaciers and polar ice caps, 1% in freshwater lakes, rivers, and underground aquifers
- Water cycle: evaporates, condenses, and precipitates, repeating the process continuously
Human Uses of Water
- Drinking water: essential for human consumption and sanitation
- Agriculture: irrigation and crop growth
- Industry: cooling systems, manufacturing, and energy production
- Recreation: swimming, fishing, and other leisure activities
Physical Properties of Water
- Water's chemical formula is H2O, with a molecular weight of 18.02 g/mol.
- At 20°C, water has a density of 1 g/cm³.
- Water boils at 100°C and freezes at 0°C at standard atmospheric pressure.
Chemical Properties of Water
- Water has a neutral pH of 7 at 20°C.
- Water is amphoteric, meaning it can act as both an acid and a base.
- Water participates in many chemical reactions, including hydrolysis and oxidation.
Biological Importance of Water
- Water makes up approximately 60% of an adult human's body weight.
- Water is essential for various cellular processes, including metabolic reactions, temperature regulation, and waste removal.
- Water is necessary for photosynthesis, which is crucial for plant growth and oxygen production.
Water in the Environment
- Water covers approximately 71% of the Earth's surface.
- Of the Earth's water, 97% is found in oceans, 2% in glaciers and polar ice caps, and 1% in freshwater lakes, rivers, and underground aquifers.
- The water cycle involves continuous evaporation, condensation, and precipitation.
Human Uses of Water
- Water is essential for human consumption and sanitation.
- Water is used in agriculture for irrigation and crop growth.
- Water is used in industries for cooling systems, manufacturing, and energy production.
- Water is used for recreational activities, such as swimming and fishing.
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Description
Test your knowledge of water's physical and chemical properties, including its chemical formula, density, boiling point, and more.
