CE chem

alan_given

Originally posted by MatthewChor at 2005-5-17 13:31:
29,36...anyone can explain

29-唔知
36-decreases down the group喎

2076

Originally posted by MatthewChor at 2005-5-17 01:32 PM:

yes.....2PbO + PbO2 = Pb3O4

i use 2元1次聯立方程解

TAMTOM

Originally posted by 2076 at 2005-5-17 13:33:


i use 2元1次聯立方程解

....

alan_given

Originally posted by MatthewChor at 2005-5-17 13:32:

yes.....2PbO + PbO2 = Pb3O4

it hv round off problem
Pb should 90.7% by mass

好~delete佢

MatthewChor

Originally posted by 2076 at 2005-5-17 01:32 PM:


29 cannot explain
seems that 1st statement correct but 2nd wrong

36 越底metallic bond越弱

29.....yes lor
36.....that's why melting pt decrease?
         why not reducing power ge

MatthewChor

Originally posted by alan_given at 2005-5-17 01:33 PM:


好~delete佢

要我sub 2:3 同 3:4

2076

Originally posted by MatthewChor at 2005-5-17 01:34 PM:

29.....yes lor
36.....that's why melting pt decrease?
         why not reducing power ge

越大lose electrons 越容易=>reducing power increases

TAMTOM

Originally posted by alan_given at 2005-5-17 13:33:


好~delete佢

2076

Originally posted by MatthewChor at 2005-5-17 01:34 PM:

要我sub 2:3 同 3:4

i calculate 1:1.34
not need sub wor

pancake

Originally posted by MatthewChor at 2005-5-17 01:34 PM:

29.....yes lor
36.....that's why melting pt decrease?
         why not reducing power ge

36 i  choose b also

2076

Originally posted by pancake at 2005-5-17 01:35 PM:

36 i  choose b also

我覺得一定唔係

btw 第48題係...

MatthewChor

Originally posted by 2076 at 2005-5-17 01:34 PM:


越大lose electrons 越容易=>reducing power increases

get the wrong meaning
I think it is ability to gain electron....

should be 48/50

TAMTOM

Originally posted by 2076 at 2005-5-17 13:36:


我覺得一定唔係

btw 第48題係...

我選B

MatthewChor

Originally posted by 2076 at 2005-5-17 01:35 PM:


i calculate 1:1.34
not need sub wor

我round off左...

2076

Originally posted by TAMTOM at 2005-5-17 01:36 PM:

我選B

x2

我覺得enhance依個字係關鍵
but o個d 3大神全部揀A wor

TAMTOM

36 唔係A 咩?

pancake

Originally posted by 2076 at 2005-5-17 01:36 PM:




btw 第48題係...

A

2076

Originally posted by TAMTOM at 2005-5-17 01:37 PM:
36 唔係A 咩?

i choose a

MatthewChor

Originally posted by 2076 at 2005-5-17 01:37 PM:


x2

我覺得enhance依個字係關鍵
but o個d 3大神全部揀A wor

A la...

TAMTOM

Originally posted by MatthewChor at 2005-5-17 13:36:

get the wrong meaning
I think it is ability to gain electron....

should be 48/50

都有A啦...
唔好學個D 人咁啦.."我錯左3題 ,好驚A 唔到啊"