September 29th Blog Entry By Greg Sra

In today's class we learned about matter, physical and chemical changes and did a laboratory assignment on Physical and Chemical changes. We were also assigned a Laboratory Report.



Matter: Is anything made of atoms or particles. (Basically everything around you)

Physical Change: A physical change doesn't have any change in the chemical composition. A physical change occurs when the physical properties are changed. An indication that a physical change has occurred  is if there is a change in: texture, shape, density, volume, mass, and weight.  An example of this is a hockey stick. It is still composed of wood and has the same wood properties. The only thing changed is the physical appearance which is a physical property.

A  piece of wood turning into a hockey stick is an example of a Physical Change

Chemical Change: A chemical change occurs when the product undergoes a chemical reaction thus changing the chemical composition. An indication that this is happening is if the product starts: changing colours or bubbling.  Examples of this include: vegetables spoiling, fermentation, a metal rusting, and photosynthesis. A link to a video about Chemical and Physical Changes

SEPTEMBER 27 -- MARCUS LU

Overview of Material covered in class:
- Matter. What is it?

- Physical and Chemical changes

- properties of solids, gasses, liquids

- Quiz on unit conversions

Notes:  

- Matter:  

Matter is everything that has mass and takes up space ( volume ) . There are two types of matter , PURE SUBSTANCES, and MIXTURES. 

- Physical Change

a physical change is a change where no new substance is formed.  These types of changes are also reversible

-Chemical Change

a chemical change is a change in which a new substance is produced.  These types of changes are irreversible

SOLIDS: solids do not change shape very easily.  They have little change when exposed to heat

LIQUIDS: Liquids take the shape of their container, and change slightly under heat

GASSES:  Gasses take the shape of their container, and drastically change when heated.

September 23

Today we reviewed and  had a practice quiz on unit conversions with quantities and scientific notation . Unit such as gram(g), meter(m), liter(L), and second(s) can be convert it into Tera, Giga,and etc...                    For example, Tera gram, Giga meter, or Milli second.





How to convert unit
For example, if you want to convert 4 m into mega meter, then first you should know how big mega meter is. At left chart, it said Giga is 10⁹   greater
than meter. So, equation should be.....................4m×Gm/10⁹m
Always unit that you want to convert into should
be at the top of fraction and unit you want to get
rid of should be at the bottom. meters cancel ea-
ch other out ( meter divide by meter is nothing)
then equation becomes.....................................
4×Gm/10⁹ right? then 4 times Gm is 4 Gm
and  now you have the answer 4Gm/10⁹
or 4Gm/10000000000 or 0.000000004

But writing 0.000000004 Gm is too long, so 
we use scientific notation 
0.000000004 Gm is 4×10⁹  Gm in scientific
notation. When you actually
calculate 4×10⁹ 
Gm is same as 0.000000004 Gm. But it just
shorter

posted by Nick kim

SEPTEMBER 21

FIRST POST OF THE YEAR !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!  Today we learned about Scientific Notation, and received some wonderful worksheets to practice our skills at converting units.  There is a quiz on Monday on Converting units.