Test

Today we had our test over chapter 2 and 5. It wasn't that easy for me, but then again it never really is! It doesn't help that I fell asleep on my book while studying, but at least I got some sleep right? The test was over matter, sig figs, and dimensional analysis. There were some questions that I got confused on, but hopefully I didn't fail.

Scientific Notation

 In class the other day, we were taught ( or reminded) how to do scientific notation. I think it looks confusing, but once you do one, it's pretty easy. Lets say you have the number 0.0804. With this number, you would have to move the decimal to the right until there is one significant figure to the left of it. So you would move the decimal two spots over, in-between the 8 and the 0 to the right of it. So the new number would be 8.04. We times this number by ten because when you move the decimal over, you are multiplying it by 10 or -10. In this case, we are multiplying it by -10 since it is moving to the right. The scientific notation of this number would be 10 x 8.04 -2  ( the two is suppose to be an exponent) 

Matter Notes

Today in class we breezed by chapter two, talking about matter. Matter is anything that takes up space, and it comes in three forms, solid, liquid, and gas. Take water for example, to change it from a liquid to a gas, you would have to raise the temperature to do so. Raising the temperature also increases the kinetic energy.
          We also talked about physical properties, which can be observed without changing a substance into another substance. An example is boiling water, and the density of something.
          There is also chemical properties, which can only be observed when a substance is changed into another substance. An example of this is flammability.