LAB DAY

Today was our first lab day. No one was injured, all was well. We learned how to distinguish between CHEMICAL and PHYSICAL changes.

Please refer to the Tuesday, September 28^th, 2010 Blog if you don’t remember their properties. But, if you’re too lazy to scroll down, or you feel insecure with the picture of Jodie’s dog, Bobby, staring at you, here’s a brief definition:

CHEMICAL CHANGE: substances form to create NEW substance(s), irreversible. (e.g. burning wood)

PHYSICAL CHANGE: NO new substance is formed, reversible. (e.g. melting ice cube)



Glass Square/ Experimental Results Table



During the lab, we used a set of 4 unknown solutions, and combined them in a 4x4 glass square using medicine droppers. There were only six different combinations. Some had no change, but others showed surprising results.



Test Tubes







Medicine Dropper



Fun Fact of the Day

DID YOU KNOW… the amount of iron in an adult’s body is equivalent to the amount of iron in an iron nail??

By: Jason Zhang

Matter matters the most

Hi, to lighten the serious blogger mood, I took the obligation and inserted an alliteration joke for you all...hence the title.HAHA.................................................................................................................... ......not funny.

Anywho, our lovelylovely teacher who shall remain anonymous tried ever so hard to refresh our memories with gr.10 chem. That included matter, states of matter and, changes in matter.


Matter doesn't necessarily matter the most, but we should all at least know what it means..

Well, matter is basically anything that has mass or takes up space!That includes YOU, and ME, and THAT DOG!(his name is Bobby)

To continue, well there are 2 types of  matter: Pure substances and Mixtures

Pure substances: 
-have one set of properties; elements and compounds are a good example
-cannot be separated into 2 parts by physically or mechanically
-have a constant composition-homogeneous (eg-H₂O )

Mixtures
-shows the properties of the pure substances in the mixutre
-can be separated
-does not have a uniform composition-heterogeneous(eg-salad dressing)

I think we all know the states of matter so I'll be brief.....They are solids(shape doesn't change easily), liquids(takes shape of container) and gas(no shape)

There are 2 types of changes: Physical and Chemical change

Physical Change
no new substance is formed in a physical change, it can also be reversed.(eg-dent in a soda can)

Chemical Change
new substance is formed, irreversible. (eg- cooking)


Soooo yea, that's what we learnt so far.


May you live long and prosper :)

:jodie ng

Unitary Conversion Quiz

Ms. anonymous gave worksheets to practice for the unitary conversion quiz on September 27.

This video sums up how to convert units:
http://www.youtube.com/watch?v=XKCZn5MLKvk&feature=related

You will also have to memorize the SI prefixes and Conversion factors:

*memorize everything except exa, peta, femto and atto.

One Way to Memorize the SI Prefixes 

Every  Player  That  Gets Mangled  May    Never  Play   Football   Again 

Exa     Peta    Tera  Giga Mega      Micro  Nano   Pico    Femto    Atto 

1018  1015   1012   109   106         10-6  10-9    10-12  10-15    10-18                                                   

The first letter of each word represents the first letter in a prefix.  The large prefixes are in the 

beginning, the small prefixes are at the end.  The very common prefixes of kilo, centi, mill, etc are omitted in the middle of the mnemonic.  You may also notice that all of the exponents are spaced apart by values of 3. 


By: Hikari Hoshika

Scientific Notation

Scientific notation is a method for expressing very large or very small numbers in powers of 10.  Scientific notation will make your life easier because of its short hand method for writing numbers and its easy method for calculations.  Numbers in scientific notation are made up of three parts: the coefficient, the base and the exponent.

  Ex. 1:                                         6.03 x 10⁷ exponent
                                                  coefficient         base

1. The coefficient must be greater than or equal to 1 and less than 10.
2. The base must be 10.
3. The exponent must show the number of decimal places that the decimal needs to be moved to change the number to standard notation.  A negative exponent means that the decimal is moved to the left when changing to standard notation.

Solution: Simply move the decimal seven places to the right because the exponent is 7.

 Ex. 2: Change 5.3 x 10^-4 to standard notation.

So, 6.03 x 10⁷ = 60 300 000

The exponent tells us to move the decimal four places to the left.

so, 5.3 x 10^-4 = 0.00053

If calculating scientific notation on a calculator, the numbers in scientific notation must be entered in E notation.

For example, 1.23 x 10^7 is entered as 1.23E7 or 1.23e7.

Example of Unitary Rates
  

1m = 100cm

1m² = 100cm²  (100cm X 100cm)

1m³ = 100cm³  (100cm X 100cm X 100cm)

 

1Mg = 1,000,000g

1Mg² = 1,000,000g²  (1,000,000g X 1,000,000g)

1Mg³ = 1,000,000g³  (1,000,000g X 1,000,000g X 1,000,000g)

 

 

Convert: 72dam² into mm²

 

dam → mm

1dam → 10⁴mm

1dam² → 10^4X2mm²

1dam² → 10⁸mm²

 

72dam² X 10⁸mm²  = 72 X 10⁸mm²

                 1dam²

 

= 7.2 X 10⁹mm²

 

 

By: Hikari Hoshika  &  Jason Zhang