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化學

[Selected]: 所有分類 科學 化學


一名學生使用碳電極來電解稀氯化銅 (II) 溶液。[陽極的生成物 與 陰極的生成物分別是什麼??] 答案係 陽極生成氯氣 及 陰極生成銅
我想問點解陽極吸引氯離子而唔係氫氧離子,唔係濃度高既氯離子先會比氫氧離子優先放電咩??

2007-01-02 08:47:43 · 2 個解答 · 發問者 STEVIE-G™ 7

何謂adipocytokines,它會包含什麼物質,對於glucose, lipid代謝有什麼影響。
謝謝

2007-01-02 07:41:35 · 1 個解答 · 發問者 月凌 1

想請問各位~~

含鉀離子很高的食物
我知道有 橘子,楊桃,香蕉 這三種以外
還有哪些 含有很高的 【 鉀離子 】呢???

食物和水果裡面有哪些呢???~

2007-01-02 03:30:47 · 1 個解答 · 發問者 ? 3

CO2
CH4
N2O
HFCs
PFCs
SF6

就這五種 如果方便的話可以詳細說明一下嗎??
謝謝!!

2007-01-02 02:04:38 · 2 個解答 · 發問者 Sweetie 2

Which of the following is NOT a majar pollutant from car exhaust?
A NO2
B soot
C lead compound
D SO2

2007-01-01 18:01:31 · 2 個解答 · 發問者 2003 2

0

Which of the following statement about statements about alkane series and alkene series is/are correct?
(1) sccessive members differ by a -CH2- unit.
(2) Members in both series have similar chemical properties
(3) Both of them give CO2 and H2O when burnt complete in air
A (1)
B (2)
C (1) and (3)
D (2) and (3)



ans:C
Why (2) is not correct?

2007-01-01 18:01:05 · 2 個解答 · 發問者 2003 2

突然想到一個問題,就是人呼出一口的二氧化碳濃度約多少ppm?請專家幫我解答,謝謝!

2007-01-01 17:02:27 · 2 個解答 · 發問者 袁 先生 3

What is the chemical name of vitamin C ?

2007-01-01 14:30:58 · 1 個解答 · 發問者 ? 3

假設依家有4個C
最左果個C有一個CI
最右果個C有一個Br
其他都係H
咁呢個究竟係
1-brmo-4-chlorobutane
還是
4-bromo-1-chlorobutane?

係點睇,一定係由左至右睇定點?

2007-01-01 14:14:21 · 1 個解答 · 發問者 2003 2

calcium sulphite
soluble or insoluble?

2007-01-01 14:11:01 · 1 個解答 · 發問者 2003 2

此物質(substance) 和彼物質(matter)有何分別?

佢地之間有咩唔同ar??

我想要中文的詳解

2007-01-01 12:47:37 · 1 個解答 · 發問者 zero 1

In 67.5g of hydrated aluminium sulphate Al2(SO4)3.6H2O ,calculate
1)the number of moles of aluminium ions

2)the number of moles of water molecules

3)the number of sulphur atoms

4)the number of oxygenatoms

5)the number of ions
(Relative atomic masses:H=1;O=16;Al=27;S=32)

2007-01-01 12:36:11 · 2 個解答 · 發問者 ych_8893 2

1.an oxide of a metal Xhas the empirical formula of XO.when 97.2g of the oxide is heated strongly, t decomposes to give 90.0g of the meat.what is the relative atomic mass of X?(relative atomic mass of O is 16)

2007-01-01 11:23:22 · 2 個解答 · 發問者 SUP DOG 1

可卡因是不是毒品?為什麼有些鎮咳藥中也有這種成份?

2006-12-31 19:54:18 · 3 個解答 · 發問者 lankwanyin 2

1. Predict the observation when excess hydrogen gas is bubbled into AgNO3(aq)

hydrogen 是不是more reactive than Ag? 那是否會有displacement﹖如果有,expected result是不是solution become colourless and some silvery solid is formed?

2. A large amount of NaCl can be obtained from sea water, but Na metal is very expensive, why?

是不是electrolysis是一種很貴的方法﹖如果是,咁點解貴﹖

3. K is more reactive than Na, why?
是不是因為repulsion 大過Na?

4. Na is more reactive than Mg, why?

2006-12-31 17:41:40 · 2 個解答 · 發問者 wai shing 1

BEES WAX~
TRIOCTANOIN~
SILICADIMETHYL~
SILYLYATE~
SQUALANE~
OCTYLDODECANOL~

2006-12-31 17:35:34 · 1 個解答 · 發問者 ? 2

任何一種電池報告
國三學生要的!!!
請簡潔
整理過的
一種電池~~~
不要用複製貼上!!!

2006-12-31 17:14:23 · 2 個解答 · 發問者 ? 3

Al(s)+MnO4-(aq)→MnO2(aq)+Al(OH)4-


Zn(aq)+HCl(aq)→ZN2+(aq)+H2(g)

自己嘗試的去寫出平衡方程式 但是有些地方還是搞不太清

請各位大大幫我解出謎團

2006-12-31 17:06:34 · 2 個解答 · 發問者 Anonymous

1)為什麼軟水在皂性清潔劑和非皂性清潔劑內都有泡沫生成??
2)為什麼硬水在皂性清潔劑會生成浮渣..而在非皂性清潔劑有泡沫生成??
3)為什麼硬水+十水合碳酸鈉在皂性清潔劑有泡沫生成??
感激不盡~!!

2006-12-31 16:18:36 · 1 個解答 · 發問者 ? 1

呵呵 騙到你進來了 其實也不大難 呵呵

我的化學老師說「光」不是matter (matter 之定義是 has mass and occupies space)

但之前我讀課外書(物理),說光同時具有波和粒子的特性,且有質量,那怎麼我的化學老師說「光」不是matter?

除此之外,還有什麼不是matter?(還有 spirit 對吧! 之外呢?)

2006-12-31 15:23:36 · 2 個解答 · 發問者 放 rakion acc 5

What is tha ionic half-equation(involving electrons) for the oxidation of oxalate ions?

2006-12-31 14:04:32 · 1 個解答 · 發問者 Raymond Tsang 3

苯甲基和甲苯的差別
苯甲基和甲苯的差別
苯甲基和甲苯的差別
感激不盡~~

2006-12-31 11:35:29 · 1 個解答 · 發問者 天天 2

問:什麼是輕水?什麼是重水?
可以喝嗎?
是做什麼用的?
其化學成份為何?
輕水是怎麼形成的?
重水又是怎麼形成的?

2006-12-31 09:05:58 · 2 個解答 · 發問者 Anonymous

0

CrO4(2-)個名係乜?
CrCl3個名係咪叫chromium(III) trichloride?

2006-12-31 08:39:16 · 2 個解答 · 發問者 Kenneth 2

are the following compound soluble or insoluble?

1. Calcium oxide
2. Calcium hydroxide
3. Calcium carbonate
4. Calcium sulphate
5. Calcium chloride

2006-12-31 08:05:37 · 2 個解答 · 發問者 2003 2

0

Q1 which of the ofllowing hazardous warming labels should appear on a bottle of Na metal ?

A carcinogenic
B explosive
C oxidizing
D toxic

Why the answer is A but NOT B?

Q2
sodium chloride crystal is formed during evaporation of seawater
Why this statement is wrong?
don't NaCI is formed when its saturated solution cool down?

2006-12-31 08:03:45 · 1 個解答 · 發問者 2003 2

0

Which of the following about water is INCORRECT?

A The density of water is highest at 4 degrees Celsius
B On a high mountain , water boils at a higher temp.
C Each water molecule consisits of 2 hydrogen atoms and 1 oxygen atom.
D water turns blue cobalt (II) chloride paper pink

Please comment on A and B....

2006-12-31 08:01:02 · 1 個解答 · 發問者 2003 2

A cracked light bulb CANNOT glow because

A. the circuit is shorted
B. the leakage of argon gas
C. the tungsten wire rusts
D. the tungsten burns out in air

A and C are obviously wrong
Why the answer is D but NOT D ?

2006-12-31 07:58:53 · 1 個解答 · 發問者 2003 2

如題...點解其他唔得ge?

2006-12-31 07:01:04 · 2 個解答 · 發問者 ? 1

(1)廢水進流
(2)抽水井
(3)自動攔污柵
(4)調整曝氣池
(5)接觸氧化池
(6)最終沉澱池
(7)消毒水池
(8)放流水池
(9)污泥濃縮池
以下該如何詳細的說明...處理流程以及用途在哪?
這些是跟醫療廢水的處理有關的...謝謝~!!

2006-12-30 19:55:29 · 1 個解答 · 發問者 仔仔 1

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