Tuesday, April 15, 2008

Went over procedures for crystal test, acid test, flame test.
1. Look at crystals under the microscope and, in your data table, sketch the characteristic shape of the crystals.
2. Scrape the crystal in to a pile and add 1-2 drops of HCl. Check for fizz or no fizz. Enter results in data table.
3. a. Light alcohol lamp.
b. Put spoon in flame with no crystal to check for flame color and burn off any contamination.
c. Rinse spoon in water.
d. Scoop up a part of the crystal with spoon, place in flame, check color of flame. Record in data table
e. Rinse spoon between each trial.

Went over data when everyone was done. Everyone should have a complete data table in their notebook.

Sink or swim exercise. Discussed density. Density of water = 1 g/cc. If an object has a density less than 1 g/cc it will float in water. If the density is greater than 1 g/cc, it will sink. If you get a density greater than 23 g/cc, you probably have made a mistake.

Density = mass/volume.