化學

Hydrogen in most of its compounds has an oxidation number +1, but the oxidation number of hydrohen is -1 in metallic hydrides.Then what is metallic hydrides?

2007-06-10 11:24:05 · 1 個解答 · 發問者 kwan 6

Hydrogen in most of its compounds has an oxidation number +1, but the oxidation number of hydrogen is -1 in metallic hydrides.Then, what is metallic hydrides?

2007-06-10 11:20:39 · 3 個解答 · 發問者 kwan 6

硫酸鐵(III)+氫氣化鈉的完整方程式和離子方程式

2007-06-09 10:30:50 · 1 個解答 · 發問者 tangyunfaat 1

1.若H2為理想氣體,25度C 0.50mol 壓力為4的H2,經等溫壓縮至體積成為原來的1/2時,則此時壓力為多少?


2. 0.360M的KOH,其pOH為多少..?

3.若H2 O2 CO2皆為理想氣體,在25度C時,此三種氣體平均動能分別為Eh2 Eo2 Eco2 則Eh2=Eo2=Eco2 為什麼沒有大小差別?

答案1為8atm
2為0.444
請問計算過程 謝謝~!

2007-06-05 13:08:26 · 2 個解答 · 發問者 chen277116 2

ZnS + O2 -------> ?????? why???????

2007-06-05 11:40:49 · 2 個解答 · 發問者 Anonymous

電解水欲產生32克的氧(O2)則需提供多少法拉第電量...?

答案為 4個法拉第電量

請問如何計算出來? 謝謝

2007-06-04 09:45:43 · 1 個解答 · 發問者 chen277116 2

下列水溶液中何者沸點最高..?
(A)1.0m NaOH
(B)1.0m BaCl2
(C)1.0m 葡萄糖
(D)1.0m HClO4

請問判斷的方法..?跟分子量的大小有關嗎?謝謝~!

2007-06-03 06:08:44 · 2 個解答 · 發問者 chen277116 2

SAAB的AERO是用純酒精的
但是酒精的燃燒不是會產二氧化碳嗎
那為什麼它標榜著零二兩化碳排放??

新聞在這個網頁
http://tw.autos.yahoo.com/auto_information_article2/url/d/a/070530/4/15nq.html

2007-06-01 15:56:58 · 1 個解答 · 發問者 Richard 1

When a metal X is added to an aqueous solution of copper (II) sulphate, a reddish brown solid is liberated. Which of the following is/are true?
i. The cation of X is a weaker oxidizing agent than the copper(II) ion
ii.X is a stronger reducing agent than copper
iii. The cation of X is reddish brown

A. i only
B. i and ii only
C. i and iii only
D. ii and iii only

2007-05-29 14:50:42 · 1 個解答 · 發問者 2003 2

When a piece of copper foil is heated by a Bunsen flame, the foil
A. does not burn but turns black
B. does not burn but turns brown
C. burns with a green flame and a grey powder is formed
D. burns with an orange flame and a grey powder is formed

2007-05-29 14:50:07 · 1 個解答 · 發問者 2003 2

金屬氧化物 同水反應 生成物是甚麼?

2007-05-28 17:51:01 · 3 個解答 · 發問者 ? 1

SO2 is a bleaching agent,為何 sulphur dioxide 不能decolourize acidified potassium dichromate?

2007-05-28 12:13:06 · 1 個解答 · 發問者 2003 2

Rubidium ( Rb ) and potassium belong to the same group in the periodic table . The relative atomic mass of rubidium is larger than that of potassium .
a ) Explain whether rubidium is more reactive than potassium .
b ) Suggest how rubidium can be stored safety in the laboratory .
c ) Suggest ONE satety precaution for handling rubidium in the laboratory .

2007-05-26 09:22:44 · 2 個解答 · 發問者 怡文 1

公司急用

我要2006年10月~2007年5月的鋁料價格。

網上查不到，很急急急急

2007-05-25 10:20:10 · 2 個解答 · 發問者 快樂丫毛妹 1

最近工廠有接到一筆「鍗銅」的訂單,我很想知道他是啥麼材質,運用在工業那個領域ㄋ,歡迎專業人士提供我一些訊息,另外我們是做銅電子零件的工廠,歡迎有這方面需求或知道科技公司採購單位有這需求的網友提供我們合作開發製作,歡迎連結我們工廠網站看看 http://www.104info.com.tw/comp/28327415000.htm 上豪精密電子有限公司06-2437906 傳真06-2323712

2007-05-24 10:41:21 · 2 個解答 · 發問者 一個累馬 1

為甚麼氫不屬於任何Group？

2007-05-23 15:32:58 · 3 個解答 · 發問者 小Ｇ 4

The container with a mass of 45.0g and a total capacity of 525 ml is used to collect of gas in a swamp. Upon analysis, the container of mysterious gas is found to have a mass of 47.267g at a pressure of 2394 torr. at a temperature of 30.0 degree Celsius . What is the molecular weight of the mystery gas? Can you suggest a possible identity for the gas?

2007-05-21 06:53:37 · 1 個解答 · 發問者 goodaskmansir 1

請問一下..
PB1是指銅合金的"磷青銅"嗎?
有什麼特性呢?
加工性質及硬度呢?

2007-05-18 02:36:26 · 1 個解答 · 發問者 ? 3

What is the balance equation of adding dilute NaOH (aq) into Citric Acid (aq)?

2007-05-16 18:28:03 · 1 個解答 · 發問者 懶洋洋的彼得 2

the progress of the reaction
5Br-(aq)+BrO3-(aq)+6H+------>3Br2(aq)+3H2O(l) is studied in the laboratory.Potassium bromide, potassium bromate, sulphuric(VI) acid,phenol and methyl range indicator are mixed and the time required for the red to disappear is recorded.
a)Why is there a red colour found in the mixture?
b)Why does the red colour disappear after some time?

2007-05-16 17:26:12 · 1 個解答 · 發問者 Anonymous

"H+(aq) + OH-(aq) -> H2O(l)
This is the ionic equation for the neutralisation of a STRONG acid and a Strong alkali."

Q1: Why does it emphasize the word STRONG? If it is WEAK, will it be correct?


"Reaction between limewater and aqueous ethanoic acid:
CH3COOH(aq) + OH-(aq) -> CH3COO-(aq) + H2O(l)"

Q2: Why does it express the reaction in such a strange way? Does the eq in (1) suit this case? Is it related to STRONG and WEAK?

2007-05-16 16:59:38 · 1 個解答 · 發問者 jason 2

請問純鎳及鎳合金有多少種?用途各為何(如耐高溫或耐腐蝕等....)?懇請大大詳述之,謝謝!

2007-05-16 06:24:21 · 1 個解答 · 發問者 小許 2

請問點解add sodium into water會係redox reaction既? 同埋條equation係點架?

2007-05-15 15:14:48 · 1 個解答 · 發問者 ? 1

今日chem做experiment滴到成條褲都啡晒，點先可以洗得甩

2007-05-15 13:43:28 · 2 個解答 · 發問者 leon 2

2004 CE Chemistry Paper 1 Q2a:

Suggest a chemical test to distinguish table salt (sodium chloride) and white sugar (sucrose).

Here is what the suggested answer says:

"Treat the substances with concentrated sulphuric acid. White sugar turns black, while table salt gives misty fumes."

My question is: What is the "misty fumes" as mentioned in the suggested answer? How is it formed? (Chemical equations are always welcome.)

2007-05-15 12:41:13 · 1 個解答 · 發問者 Anonymous

請問膏狀的物質是屬於液體或固體
如凡士林.牙膏...又是屬於哪一類?
好心人士幫幫我吧!!

2007-05-14 04:36:41 · 4 個解答 · 發問者 yaron 2

問美耐瓷的製造原料是否可降解或生物分解,想知道是否環保,它的價格比一般的器皿貴嗎?

2007-05-13 10:17:16 · 1 個解答 · 發問者 Anonymous

(a) 催化劑不能改變反應熱
(b) 催化劑可降低正反應之活化能前並提高逆反應之活化能

2007-05-13 09:51:35 · 1 個解答 · 發問者 Eva 2

CH4
He
CF4
CH3CH2CH2OH

2007-05-13 09:43:37 · 2 個解答 · 發問者 Eva 2

From the list below, select the preferred reagent for converting 1-propanol to propanoic acid:

A. PCC/CH2Cl2

B. Sn/HCl

C. H2/Pt or H2/Ni

D. NaBH4 or LiAlH4

E. CrO3/H+ or K2Cr2O7/H+ or KMnO4

2007-05-13 09:18:05 · 1 個解答 · 發問者 ? 1