Answer:
Freezing point: <u>32 ºF (0ºC)</u>
Melting point: <u>32 ºF (0ºC)</u>
Boiling point: <u>203°F (95°C)</u>
Explanation:
At the boiling point, <u>the vapor pressure of a liquid equals the external pressure</u>. The normal melting point and boiling point of water at 1 atm are 0°C and
100°C, respectively. Decreasing the pressure under 1 atm (what happens when we are at high altitudes) will lower the boiling point since the external pressure will be lower, and it will become equal with the vapor pressure at a lower temperature.
However, the melting point and freezing point will stay unaffected since they don't depend on air-pressure; so at 0 or 5000 meters they will still be 0°C (remember that, <u>since water is a pure substance, the freezing and melting points will be the same</u>).
One mole equals 20 grams so I would say b
Answer:
C
Explanation:
C. It is considered a cooling process and it lowers the average kinetic energy of the liquid because the higher energy molecules turn to vapor.
Moreso, evaporation does not increase the average kinetic energy because it is a surface phenomenon. Also, as molecules excape at a fast moving rate, the left over molecules have a lower kinetic energy and this consequently decreases the temperature of the liquid.
When molecules absorbs heat, the evaporate and this phenomental process provides cooling in the system
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The answer is A I believe. If you are refering to the periodic table in this question, then the bottom left are the earth metals, transition metals, etc. The upper right corner are the noble gasses.
