A chemist uses a hot plate to heat a liquid in a beaker with a few boiling chips

Question

A chemist uses a hot plate to heat a liquid in a beaker with a few boiling chips. Which of the following observations indicates that the liquid has just begun to boil?

A). The volume of liquid begins to decrease significantly

B). The temperature of the liquid reaches its known boiling point

C). Bubbles begin to stream up from the boiling chips or the bottom of the vessel.

D). Vapors begin to condense on the walls of the vessel, just above the liquid surface.

E). Tiny bubbles are visible sitting on the boiling chips.

Explanation / Answer

Answers:

A). The volume of liquid begins to decrease significantly

B). The temperature of the liquid reaches its known boiling point

D). Vapors begin to condense on the walls of the vessel, just above the liquid surface.

Explanation: The boiling point of a liquid is the temperature at which the liquid's vapor pressure equals the external pressure (normally atmospheric 1 atm). Once the temperature of the liquid reaches its known boiling point, the liquid has just begun to boil. In this process some of the liquid vaporizes, hence the volume of liquid begins to decrease significantly. We can also observe that vapors begin to condense on the walls of the vessel, just above the liquid surface due to loss of heat energy from liquid vapor through beaker to atmosphere.

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