Solubility Rules

Below is a chart to help you determine the solubility of certain compounds. These rules only apply for double replacement/ precipitate reactions. Below the chart are some helpful links.


Practice Quiz
Mnemonic Tricks Video
Solubility Rules Explanation Video

Unit test

     Today we took our test for our chemical reactions unit. I feel like I did not do too badly on this test. I am certain that this unit test went better than the last unit test (chemical composition). This time around I feel like I knew more material on the test and had plenty of time to finish it. I only felt unsure about a handful of questions, but felt comfortable with the material overall. I tried to read every question carefully, but I still feel like I may have forgotten a small deatail and messed up a lot of questions. Hopefully that feeling does not turn out to be true.

Activity Series of Metals Lab

In this lab, we combined 4 metals (Pb, Cu, Ca, Mg, Sn, and Zn) with 4 different solutions (H20, HCl, CuSO4, and AgNO3) to observe the reactions taking place. Below are a few pictures of our products of the reactions.

What is an Activity Series?

Oxidation Numbers

The rules for determining oxidation numbers are:

• Each atom in a pure element has an oxidation number of zero.
• For monatomic (metal cations) ions, the oxidation number is equal to the charge on the ion.
• Fluorine always has an oxidation number of -1 in compounds with all other elements.
• Cl, Br, and I always have an oxidation number of -1 in compounds, except when combined with oxygen or fluorine.
• The oxidation number of H is +1 except in compounds with metals (hydrides) when H is -1
• The oxidation number of O is -2 except in peroxides when O is -1
• The algebraic sum of the oxidation number for the atoms in a neutral compound must be zero. In a polyatomic ion, the sum must be equal the ion charge.

Remember:

• Oxidation numbers can be fractions
• Oxidation numbers and charges are not the same thing, nor are they written the same
• +2 is oxidation 
• 2+ is charge

Oxidation Number Practice Quiz
More information

Chemistry Lab

Last week we did a lab that involved mixing different chemicals together and observing any reactions taking place. Overall, it was a simple lab, but it was cool to see the different reactions happening. After our data was collected, we found the molecular and complete ionic formulas of each of the successful reactions. Below are pictures of all of the reactions. As you can see, some combinations of chemicals had no change, some caused a slight color change, and some caused a drastic color change.