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Questions and Answers
What is the chemical formula of water?
What is the chemical formula of water?
- NaCl
- CO2
- H2O (correct)
- CH4
What percentage of the Earth's surface is covered by water?
What percentage of the Earth's surface is covered by water?
- 30%
- 71% (correct)
- 50%
- 90%
In what forms does water exist on Earth?
In what forms does water exist on Earth?
- Solid, liquid, gas (correct)
- Liquid, gas, plasma
- Solid, plasma, gas
- Solid, liquid, plasma
What does the chemical formula H2O indicate about water's molecular composition?
What does the chemical formula H2O indicate about water's molecular composition?
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What is the name of the liquid state of H2O at standard temperature and pressure?
What is the name of the liquid state of H2O at standard temperature and pressure?
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Study Notes
Water Basics
- The chemical formula of water is H2O.
- Approximately 71% of the Earth's surface is covered by water.
Forms of Water
- Water exists on Earth in three main forms: solid (ice), liquid (water), and gas (water vapor).
Molecular Composition
- The chemical formula H2O indicates that one molecule of water consists of two hydrogen atoms and one oxygen atom.
States of Water
- The liquid state of H2O at standard temperature and pressure is simply referred to as water.
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