Wednesday, June 1

Today in class we started the topic of Nuclear Bombardment. The main idea that Nuclear transmutations can occur spontaneously or artificially. If it happens artificially there is usually some form of bombardment occurring. There are many examples on page 4. We finished 1-6.

After we finished up with the packet we started on our lab. Our lab was on Radioactivity and Shielding. In it we had see what shields worked best against blocking beta particles and gamma rays. Then once we got that data we had to see which type of radiation did a better job of penetrating through the shields. After we collected all of our data we had an easy reading quiz that consisted of problems one could find on pages 2 and 3 of the packet.

Friday, April 15

Today we started off by flipping our packets to page 23. Mr. H said that this would be somewhat difficult, because we would have to use already learned knowledge in order to be able to work out the problems. He said that we would start out easy. The new topic that we would be learning is Ksp. It is the last topic of the unit and we should know it for the major celebration we will be having on Wednesday. Mr. H noted that if we get stuck we should look at the examples listed in our packet, which are in the book. The first thing that we did on page 23 was some review on Ionic compounds. we had to write the formulas and name the compounds. Then we had some practice with solubility and balancing equations. Mr. H also noted that when he said that there are soluble and non-soluble compounds he meant that they are partially soluble. We had some practice with this on the bottom of page 23. We then flipped to page 24, and this is what we would be putting all of those concepts together for. As I said before, Partially soluble salts dissolve only slightly in water. The dissociation of the salts are controlled by a reversible reaction that has a very small K value (much less than one). This is known as a solubility product constant (Ksp). For 4 on page 24 we had to write the dissociation equation, in which we needed to have the solubility rules. If help is needed reference example 16.1 on page 4332 in the book. After that we did some more practice on page 21 with LeChatelier's Principle. Then at the end of class we had another reading quiz which I am sure everyone did well on.

Friday, October 29

This Friday we got our Unit 3 tests and our first quarter grades. We went over the test and then Mr. Henderson explained to us that the computer took off three of our worst webassign homework grades. There seemed to have been a problem, so he said that he would fix it once we went to the science computer lab. Once we got into the science computer lab we had to get with our qroups and exchange our information and work for the flight crash problems. Mr. Henderson said that if groups finished early they could start on the homework which was a Chemthink on chemical reactions. First we had to look at the tutorial to get the idea of the subject. Then we had to take a quiz on the material we just learned. You could only get 2 wrong. If you got three wrong you had to start over. mr. Henderson also told us a bout a work sheet on the back of the new packet that would be due with the Chemthink. The page has a front and a back side to it. An easy way to get it done would be, going through the tutorial and writing in the answers as you follow.

The basics of what we will be learning about in this unit is that the starting materials are called reactants, the materials that are created are called the products. You know that there has been a change when there is an arrow in between the two. This is just a little from the chemthink. There is a lot more to it than this. But I will let you figure that out for yourself.

Friday, September 17

On Friday the first thing that Mr. Henderson asked the class to do was pull out their Unit 1 Packets and a calculator. He then told the class that we would not be staying here long, we would be going to the computer lab to do some graphing and plotting on a program called Graphical Analysis. Mr. Henderson then took attendance and we started to admire Lindsays very well set up blog post of the day before. Mr. Henderson notices that there is a link to a page with some practice for significant digits. He tells the class that for later blogs if we decided to add a link to our blog we could use that same link for our Delicious assignments.

After we had finished admiring Lindsays

blog it was time to get down to business and take a look at page 13 in our unit packets which had some density practice for us. On the page we

needed to know the formula for density which is, Density = Mass/Volume. It also talks about how the units of density are usually expressed in grams/ml or grams/ cubed centimeters. We then do problems 4 and 5. In problem 4 the density is given as 8.933 g/ cubed cm and the mass is 2.62 g. we have to find the volume of the substance so we use the equation for density and plug in the numbers we know, 8.933 = 2.62/x, in order to solve this problem we will have to use algebra. Start be multiplying both sides by 1/2.62 then we get the answer .293295, this is not the answer because we have not put significant digits into consideration yet. since we

divided we use the same amount of digits of the number with the smallest amount of significant digits which would be 2.62 which has 3. So our final answer for this problem would be .293 cubed cm.

We then go to page 14 of our packets and it is similar to what we do in the computer lab. In the computer lab we plot the volume and mass that is given on page 15 and a graph is made. Then because we have to plot our data from the Dense Cents lab, we plot our information from the Pre 82 and 82 coins and the Post 82 coins.

For homework we had to do 2 webassign assignments, finish labs 5, 6,and 7, because we would be getting them checked on tuesday, and finally we have a unit 1 test on thursday.