Which of the following has the lowest density?
Correct answer: C. Gases
- A. None of these
- B. Solids
- C. Gases
- D. Liquids
Explanation
Density is defined as the mass per unit volume of a substance. Solids have tightly packed particles, which means greater mass per unit volume and higher density. Gases have weak intermolecular forces and are highly diffusible, which enables them to expand (increase in volume) and fill up the entire container. Thus gases have the lowest densities since they have the least number of particles per given unit volume.
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About Kinetic Molecular Theory
Kinetic molecular theory explains gases as rapidly moving particles separated by large distances, with negligible volume and negligible intermolecular attraction in the ideal model. It relates temperature to average kinetic energy and explains gas pressure, Boyle's and Charles's laws, diffusion, effusion and the conditions under which real gases deviate from ideal behavior.
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