Demensional Analysis

This week we learned about demensional analysis. We used demensioanal analysis to convert one quantity to another. For example if you want to convert 8.00m to inches you have to use demensional analysis to get there. For this problem you will multiply 8.00mX 100cm/1m X 1in./2.54cm=315 in. For the most part i had a good understanding of this concept because we learned how to do most of it in trig this year . In case you need more help with dimensional analysis here are two videos:
Video 1
Video 2

Here are some examples of dimensional analysis:


http://static.prometheanplanet.com/images/resources/resource-thumbnails/thumb-nprealg-06-01-0007-diagram-thumb-lg-png.png


http://crescentok.com/staff/jaskew/isr/chemistry/factors2.gif


https://i.ytimg.com/vi/JX2ojN5FKFo/maxresdefault.jpg

Also here is a conversion table that might help:

http://cdn.rainbowresource.netdna-cdn.com/products/015024.jpg

Pre quiz jitters

Today is the day before the quiz and I'm not sure how I feel about it yet. I understand the concepts of matter such as homogeneous and heterogeneous and concepts such as physical and chemical changes but when it comes to significant figures I get really confused. One video that helped me at least a little with significant figures was this crash course video.

Mole Day

Today is mole day!
What is a mole?

Significant Figures

Yesterday in class we learned about significant numbers. This was a difficult concept to learn because you have to overlook previous math knowledge. One of the most important things we learned during this lesson was the rules of significant numbers:
In the number:
0.004004500

• The first 0 is not significant and is only there for "cosmetic purposes"
• The next two zeros are not important either and are used only to locate the decimal points
• The non zero integers are significant
• All zeros in between the non zero numbers are significant
• Significant zeros to the numbers to the right of the decimal point

Here are some videos to help with this concept:
Video 1
Video 2
Sig Fig Song :)

The Test was Alright....

Today we took the unit test over Atomic Structure and Radioactivity. This test mostly focused on Daltons atomic theory, the types of radiation, how to calculate half life's and average mass equations, acids and polyatomics, fusion and fission, and we also had to be able to read graphs. I am not sure how I did on this test. I think I did okay but I could have messed up on some problems from overthinking them. I know though, that I need to go over half life questions because those were the most difficult questions for me. Although I am not sure how I did, I did a lot of studying I read the text book pages, watched videos, and focused in class.
Here is a link to a video to help with half life.