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.

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water and alcohols have similar properties because water molecules contain hydroxyl groups that can form hydrogen bonds with other water molecules and with alcohol molecules, and likewise alcohol molecules can form hydrogen bonds with other alcohol molecules as well as with water.

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percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally