Multiple Choice
If the pressure of 1.50 L of hydrogen gas at 100°C decreases from 0.500 atm to 0.115 atm, what is the final volume? Assume temperature remains constant.
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7. Gases
Chemistry Gas Laws
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Which of the following best describes the properties of gases?
A
Gases have a definite shape but no definite volume.
B
Gases have both a definite shape and a definite volume.
C
Gases have no definite shape and no definite volume.
D
Gases have a definite volume but no definite shape.
Verified step by step guidance1
Recall the fundamental properties of gases compared to solids and liquids. Gases do not have a fixed shape or volume; they expand to fill the shape and volume of their container.
Understand that solids have both definite shape and volume, while liquids have definite volume but take the shape of their container.
Recognize that gases differ because their particles are far apart and move freely, allowing gases to change both shape and volume easily.
Evaluate each option by comparing it to the known properties of gases:
- 'Definite shape but no definite volume' contradicts gas behavior.
- 'Both definite shape and volume' describes solids.
- 'No definite shape and no definite volume' matches gases.
- 'Definite volume but no definite shape' describes liquids.
Conclude that the correct description of gases is that they have no definite shape and no definite volume.
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