3boys2girls » 化學物理生物 » 考化學無從入手

2009-4-8 15:35 m!mosa
考化學無從入手

[color=darkgreen]仲有唔夠20日就考化學
無從入手阿我(!)[/color]

[[i] 本帖最後由 kennethfuman 於 2009-4-9 11:22 編輯 [/i]]

2009-4-8 15:36 米通
[quote]原帖由 [i]m!mosa[/i] 於 2009-4-8 15:35 發表 [url=http://www2.3boys2girls.com/redirect.php?goto=findpost&pid=36845933&ptid=612797][img]http://www2.3boys2girls.com/images/common/back.gif[/img][/url]
仲有唔夠20日就考化學
無從入手阿我(!) [/quote]
平日冇好好讀書,0分係應該.

2009-4-8 15:36 michelle8986
祝你成功`

2009-4-8 15:37 |唯_*恨=]
CHEM...吾洗溫嫁喎-.-"
真系吾識就吾識-.-

2009-4-8 15:37 笨茶=]
幫你唔到;日日搵人補習 廿日應該得掛

2009-4-8 15:40 靜殿寶寶;3`
搵d識既同學幫下你吧.

2009-4-8 15:41 [Alx]命
幫你唔到.

2009-4-8 15:41 !..`蚊;`
你想人點幫你
你自己唔讀..人地幫唔到你ga囉

2009-4-8 15:43 |唯_*恨=]
CHEM其實都系記野-.-..

2009-4-8 15:44 一個無聊的人
溫左D較難的.....
同自己唔明果D問下.....MISS /呀SIR
........
抄重點嚟溫......
其實化學咁簡單...唔洗點溫都識啦..

2009-4-8 15:47 傻仔﹏明
化學你識就好易~
唔識就真係唔識= =
加油啦

2009-4-8 15:49 蛋蛋微波爐
20日...
只能說,平時種什麼,現在收什麼吧...

2009-4-8 15:53 ˋ晴babi;D
你20日真系做吾到咩
死背吧喇;)

2009-4-8 15:56 `__小盈:]
你吾肯溫冇計,
冇人可以幫到你,
最後呢20日你自己靠自己,
加油!

2009-4-10 15:57 .jusuper=)
化學你一開始識
跟住落黎既課題都好易
但唔識就真係唔識

2009-4-10 15:59 姬蓮
仲得閒開post
溫下書好過啦

2009-4-10 16:35 yuen1104
chem都系要死背-_-

2009-4-11 01:32 magiyafeimo
英文定中文教?
廿日有廿日既做法
你先背下頭二十個元素包括原子序號同特性
同埋佢地係屬於group幾
之後就睇下group同group既分別
Group 1會出+ ion, 例如K+
Group 2會出2+ion,例如Mg2+
Group 3會出3+ion例如Al3+
Group 6會出2-ion例如S2-
Group 7會出-ion例如Cl-
一group之內reactivity又會唔同

另一樣
記住d ion
H+
Ca2+
K+
Na+
Cl-

再黎係記acid同base
Acid + metal出乜
Acid + metal oxide出乜
呢d都有一個公式

另外石油都要記下,石油既分餾、汽油、柴油等等既用途,都幾熱門

你多d上黎,我講一講

[[i] 本帖最後由 magiyafeimo 於 2009-4-11 01:34 編輯 [/i]]

2009-4-14 15:31 ZeroYip
今日先見到..
我之前寫左一個我自己對ce level 既acid/base 既note
[url]http://www4.3boys2girls.com/viewthread.php?tid=589755[/url]
你唔明既可以問我
仲有
mole既問題係最easy
一定可以get full point
你要記:
color of ion
like Fe2+, Fe3+,Cu+,Cu2+,MnO4-...

redox reaction
determine which is reducing agent which is oxidizing agent
ON increase mean it is a oxidizing agent
while decrease it is an reducing agent.

property of proton neutron and electron
proton determine the chemical property of the element.
neutron determine the isotope.
same proton but difference neutron is isotope.

Bonding: Ionic bond convalent bond
ionic bond focre> convalent bond
ionic bond is the transfer of electron  between metal ions and nonmetal ion
convalent bond is share of electron between element

Group 1 and 2
when going down the group
the reactivity increase as the outermost electron is more far from the nucleus
such that the force of attraction between electron and nucleus decrease
group 6 and 7
the reactivity increase when it go up
as the distenace from outermost shell to nucleus is closer such that
it is more easy to accept electron .

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