Questions and Answers
Air is a mixture of gases, not a ______.
compound
The chemical formula for water is ______.
H2O
Water has a high ______ due to hydrogen bonding.
surface tension
The boiling point of water is ______ at standard atmospheric pressure.
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Air is ______ and tasteless.
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Study Notes
Air Basics
Composition of Air
- 78% Nitrogen (N2)
- 21% Oxygen (O2)
- 1% Trace gases (Argon, Neon, Helium, etc.)
- Variable amounts of Water Vapor (H2O)
Properties of Air
- Air is a mixture of gases, not a compound
- Air is odorless, tasteless, and colorless
- Air is essential for human life and many industrial processes
Water Basics
Composition of Water
- 2 Hydrogen atoms (H)
- 1 Oxygen atom (O)
- Chemical formula: H2O
Physical Properties of Water
- Boiling point: 100°C (212°F) at standard atmospheric pressure
- Freezing point: 0°C (32°F) at standard atmospheric pressure
- Density: 1 gram per milliliter (g/mL) at 20°C
- High surface tension due to hydrogen bonding
Importance of Water
- Essential for human life and many industrial processes
- Universal solvent, dissolving many substances
- Plays a crucial role in Earth's climate and ecosystems
Air Basics
- Air composition: 78% Nitrogen (N2), 21% Oxygen (O2), 1% Trace gases (Argon, Neon, Helium, etc.), and variable amounts of Water Vapor (H2O)
- Air is a mixture of gases, not a compound
- Air is odorless, tasteless, and colorless
- Essential for human life and many industrial processes
Water Basics
Composition and Formula
- Water composition: 2 Hydrogen atoms (H) and 1 Oxygen atom (O)
- Chemical formula: H2O
Physical Properties
- Boiling point: 100°C (212°F) at standard atmospheric pressure
- Freezing point: 0°C (32°F) at standard atmospheric pressure
- Density: 1 gram per milliliter (g/mL) at 20°C
- High surface tension due to hydrogen bonding
Importance and Roles
- Essential for human life and many industrial processes
- Universal solvent, dissolving many substances
- Plays a crucial role in Earth's climate and ecosystems
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