Friday, April 3, 2009 - Block 4A

Students wrote down content objectives in their notebooks.

Student will be able to:
Plot heating and cooling curves and identify the melting/freezing temperature and boiling temperatures, phases (solid, liquid, gas), and processes (heating, cooling, freezing, boiling, etc.)
Plot heating curves for multiple liquids and identify the boiling points and swap out temperatures for a distillation lab
Using chemical formulas, be able to identify the different elements, count the number of different elements, count the number of atoms of each element, count the total number of atoms in the substance.

I told students that no more late work would be accepted.
Discussed graph from PDB lab. Showed how to annotate it.

Students did the Boiling Point worksheet. Went over it in class, did not collect it.

Went over Fractional Distillation Day 1.

Purpose of Day 1: Find the heating curve for a mixture of two liquids.
From the graph, determine the boiling points of the two liquids and find the swap out temperatures.

Sketched lab set-up on board.

Keep a slow boil. Once you get a good boil, try to keep the wire gauze in that position. Moving it too often could mess up your heating curve.

Stop when you have only 1 cm of liquid left in the boiling test tube. Remember to raise the rubber tubing above the level of the collected liquid before capping the alcohol lamp.

Use a piece of masking tape to put your name on a petrie dish. Take a few drops of the remaining liquid from the burning test tube and put it in the petrie dish.

Dump the collected liquid and the rest of the liquid from the boiling test tube into the funnel with filter paper.

Plot the heating curve for homework.