Multiple Choice
At what temperature does pure water boil at standard atmospheric pressure (1 atm)?
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1. Intro to General Chemistry
Temperature
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When water is heated, which of the following occurs?
A
The water molecules lose energy and the temperature decreases.
B
The kinetic energy of water molecules increases, leading to a rise in temperature.
C
Water immediately freezes due to increased molecular motion.
D
The density of water increases as it is heated.
Verified step by step guidance1
Understand that heating water means adding energy to the system, specifically thermal energy.
Recall that temperature is a measure of the average kinetic energy of molecules in a substance.
When water is heated, the kinetic energy of the water molecules increases, causing them to move faster.
Faster molecular motion corresponds to an increase in temperature, not a decrease.
Note that increased temperature usually causes water to expand slightly, so its density decreases rather than increases.
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