Homework: Lab due tomorrow, 2.3- The Periodic Table- reading and WebAssign (Due 10/5).
Today in class, we got our exams back from Friday. We went over any questions that came up while taking the exam. Grades are up on Homelogic. If you have any questions about the exam or you would like to see your test, please schedule a time with Mr. Lieberman.
After we went over the exam, we began the Metal, Non-Metal, and Metalloid Lab. The goal of this lab is to identify several elements based on their chemical and physical properties. On the periodic table, all elements can be classified as either a metal, non-metal, or a metalloid. In this lab, we put eight substances through some tests to determine their malleability, conductivity, and abilities to react with HCl and CuCl2.
Metals: Elements that have luster, are malleable, and conduct electricity. Many react with acids and CuCl2 solution.
Non-Metals: Dull in appearance, brittle, and do not conduct electricity. Usually don't react with acids and CuCl2 solution.
Metalloids: Have at least two properties of both.
The appearance was recorded into a data table without any tests being conducted, as well as the luster (if it's shiny or not). But then, to test malleability, we whacked the substance with a hammer and determined if it the metal flattened (was malleable) or was smashed into pieces (was brittle):
Next, conductivity was tested. To do this, a piece of a substance was put across two pieces of wire sticking out of a battery contraption. If the substance conducted electricity, then the lightbulb on the end lit up:
Finally, the substances were tested for how they react with HCl and CuCl2. If the substance reacted with HCl, it usually rusted in the tray. A common reaction with CuCl2 would be bubbling with, potentially, a color change:
Here's a picture of the reaction between substance F and CuCl2:
Hope this helps!
The next scribe will be COLIN B.
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