3E3

hello,

im glad most of you came for the extra class and understand the concept i went through better.

remember to complete the revision worksheet given to you during lesson time by MON, 23rd aug.
pass to dzul.

you have over weekends to complete.

study hard!

3E2/3E3 extra lesson next week

since the CA2 result was horrible x 10000, Im conducting extra lesson for ALL (optional if you score B3 and above)

Changes:
3E3 - Wed, 18th Aug
3E2 - Thu, 19th Aug

Those who have MM, attend Wed's lesson.

will remind you all again during lesson.

Subsequent week
3E2 will be every Friday 1230-130 pm
3E3 on wed when there is no Bio remedial (odd week) 130-230 pm
thu when there is Bio remedial (even week) 130-230 pm

Answer sheets

Hi 3E2/3E3,

You can check the answers for the following 3 worksheets:

1) Chapter 8 Worksheet
2) Chapter 8 Worksheet 2
3) Chapter 7 revision paper

from BPS.net --> Sec 3 --> Documents --> Science

please let me know if you cant see them.

thanks.

Study hard for your common test.
(CHAPTER 5 to 8)

HOMEWORK! for 3E2/3E3

do complete all the Questions in worksheet 1 and the worksheet 2
I have given you.

BY MONDAY, 2nd August 2010.

I'll collect on that day.


thanks

Molar Mass

Molar mass = mass of 1 mol of substance.

so how do I know the molar mass of substance??

Find the Ar in periodic table add a g behind.

TADAAH! you get your Molar mass for a particular atom.

Eg.

Molar mass of Cu = 64 g
Molar mass of N = 14 g

sooooooooooooo

If i ask you how many moles are there in 28 g of N?

remember 1 mol = 14 g of N
so

28 g of N = 28/14 = 2 mols

if i ask you how many moles are there in 32 g of Cu?

Ans: 1 mol = 64 g of Cu
32 g = 32/64 = 0.5 mol


FORMULA

number of mols = mass/ molar mass


Note:
molar mass of a molecule = Find the Mr add a gram behind.

Eg.
molar mass of CO2 = 12 + 2 X16 = 44 g

the mole!

okay.

AGAIN! we are not learning about the mole on your face but its a UNIT for particles (for example: atoms, molecules, ions)

SIMPLER EXAMPLE first!

1 dozens = 12 eggs

0.5 dozens = ?? eggs
answer: 6 eggs

NOW we have

1 mol = 6 x 10^23 particles

Question 1:
0.5 mol = ?? particles
answer: 0.5 of 6 x 10^23 particles
answer: 3 x 10^23


24 eggs = ?? dozens
answer: 2 dozens

Question 2:
1.2 x 10^24 particles = ?? mols
answer: 1.2 x 10^24 divided by 6 x 10^23
answer: 2 mols

CAN? always think in terms of dozens again if still confused.

Please please do your homework given.
WORKSHEET CHAPTER 8.3 Question 3-6 by monday, 26th July

in meantime, i still want to see your file!
get a ring file and put whatever notes i have given you since term 1 inside according to content page given to you.
only 4 ppl submitted to me.

I AM BACK!

okay.

I know this is very delayed but i finally managed to figure out my password after sooooo long.

-__-''

so, do visit often for anything about my lessons.

-ms shanti-