11: 06
a hot metal plate at 150°c has been placed in air at room temperature. which event would most likely take place over the next
few minutes?
molecules in both the metal and the surrounding air will start moving at lower speeds.
molecules in both the metal and the surrounding air will start moving at higher speeds.
the air molecules that are surrounding the metal will slow down, and the molecules in the metal will speed up.
the air molecules that are surrounding the metal will speed up, and the molecules in the metal will slow down.
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The air molecules that are surrounding the metal will speed up, and the atoms in the metal will slow down.  

Explanation:

Energy always flows from a hotter object to a cooler one, so the hotplate will cool down and the air will cool down.

The temperature is a measure of the average kinetic energy of the particles, so the atoms in the metal will slow down and the molecules in the air will speed up.

answer: mercury

explanation:

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.