Multiple Choice
Shaving cream contains gas dispersed throughout a creamy liquid. What type of mixture is shaving cream?
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1. Intro to General Chemistry
Classification of Matter
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Which of the following substances is a solid at room temperature?
A
CO2 (carbon dioxide)
B
H2O (water)
C
O2 (oxygen)
D
NaCl (table salt)
Verified step by step guidance1
Understand the physical states of substances at room temperature (about 25°C or 298 K). Substances can be solid, liquid, or gas depending on their molecular structure and intermolecular forces.
Consider CO2 (carbon dioxide): At room temperature, CO2 is a gas because it has weak intermolecular forces (London dispersion forces) and sublimates directly from solid to gas at -78.5°C.
Consider H2O (water): At room temperature, water is a liquid due to strong hydrogen bonding between molecules, which raises its melting and boiling points above room temperature.
Consider O2 (oxygen): Oxygen is a diatomic molecule with weak intermolecular forces and exists as a gas at room temperature.
Consider NaCl (table salt): NaCl is an ionic compound with strong ionic bonds forming a crystal lattice, which results in a high melting point, making it a solid at room temperature.
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