If the actual change in energy was greater than o equal to the energy needed for a phase change to
occur, then we know a phase change occurred.
Lets analyze the isopropanol example,
The arrow labeled with the red "A" hexagon is
the actual energy change.
This arrow is longer than the energy needed for
a phase change to occur arrow, which is dotted
and labeled with a red "Z" box.
Question: What does the above information
implies about a phase change in the
isopropanol? (in other words, did we have a
phase change). Explain.

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation:

geosphere and hydrosphere.

this is because the geosphere has to do with geological events, while the hydrosphere controls all water on earth.