AP Chemistry – Class 64

Evaporation

Dates

• Period E/F  – Tuesday, February 5th

Big Idea: How does a substance change from one phase to another?

Discussion

The ideas of phase changes and the implications of phase changes are actually embedded in our knowledge fromt he time that we are young. We have an intuitive idea of what it means to melt ice or boil water, even if we never thought of this from a science perspective. Sometimes having this so engrained is an obstacle when discussing what is really happening during these events. Today’s lesson and conversation are centered on the idea of digging into what might really be happening, and then marrying that with what we already know. What we know isn’t wrong, necessarily, but could be a part or subset of a larger picture of this topic.

Vocabulary

One of the main jobs is to make sure know the core concepts associated with each of these. Below is a list of the key ideas from the chapter 11 reading. USING THE COURSE TEXTBOOK, define each of these according to the standard definitions from the textbook.

Connecting

• what is equilibrium vapor pressure? how is this related to boiling?
• how does a distribution of student grades explain the idea of evaporation and boiling?

Homework

• Finish Notes – Ch. 11 (1, 2, 3, 8, 9)