2/17 Chem update and homework due 2/24

Hi folks,

Today we took a bit of a step away from all the math we've been working on lately and provided some general chemistry definitions. We also did a fun and challenging lab where each lab group had to separate out a mixture of sand, water, salt and rice using different techniques for each separation. Their goal was to try to find the exact masses that I put into the mixture originally.

Homework for this week is to:

If you haven't already done this in class:
Pretending that the mixture was actually a compound, create a percentage composition for the compound according to the numbers you found.

Again, pretending that the mixture was actually a compound, find an empirical formula for the compound (Get as close as possible to whole #'s). Molar masses of the "elements" in the compound are Tawer 18g/mol, Slat 58 g/mol, Dans 60 g/mol and Icer 162 g/mol.

Find your percentage error for each of the four substances. Percentage Error = (Your result - Actual amount)/Actual amount x 100. The actual amount of water was 50g, salt was 20g, rice was 3g and sand was 50g.

Read pages to 37 - 62 in the text. Much of this will be review. Focus primarily on the information we discussed today in lecture.

Answer questions 1 - 22 on page 64 (No Math!!!!)