有冇ce chem/econ既jointus?+chem問題

急,有冇人有ce chem /econ既joint us solution?

有冇人有?soft copy,hard copy都要!我可以出黎交收俾錢買都得

順道想問:

1.con.sulphuric acid 同NaOH既state係(aq)定(l)?

2.NaOH crystal咩色?

3.點解用microscale expt比用一枝枝test tube less dangerous?

4.chlorine water係pale green丫可?

5.alkanoic acid係ionic 定covalent compound?

6.chem ce04 (27)點解唔係condensation?有h2O出worr.

(CH2CH2OH--con.sul-->CH2=CH2+H2O

7.ce04 (28)why可以用upward delivery collect ethene?

8.ce04 (35)點解唔可以spray powder from powder extinguisher去整熄燒著左既sodium?

9.hardening of vegetable oil即係咩?

10.K2SO3同HCl會有咩reaction?

11.carbonate係米要solid state同acid react出co2 同h2o?

更新:

急要econ 同 chem joint us solution 嫁,

有冇人有???

更新 2:

咁普通SO42-係米OA?例如Na2SO4

alkanoic acid點解唔係ionic既?佢有H+ wor

2 個解答

評分
  • 1 十年前
    最愛解答

    1.aq...因為會加水...for ionization

    2.na冇色...crystal應該係白

    3.應該less reactant...所以reaction冇咁vigorous...危險性相對下降...

    4.Cl2(aq) is pale yellow in colour....(gas = greenish yellow....

    5.it is covalent compound

    6.condensation係small molecules group埋出larger molecules...

    依家一舊野拆開左--點conden....

    而且佢冇左個水明顯係脫左水所以dehydration...

    7.upward delivery?答案咪話唔得囉..ans=B(1)(3)...(2)唔得...

    (1)得.水重過gas.同埋出ethene個陣都會有水出

    (2)唔得..N2=28.C2H4都係28...一樣masscollect唔到

    (3)好難唔得- -

    8.答案B(1)(3)...可以- -(同埋依題OUTC....

    9.hardening of vegetable oil即係整走double bond之後個hydrocarbon chain就可以pack more close...to form solid....(可以用Hydrogen去reduce double bond

    10.H+同SO3 2-玩redox~

    11.得k na nh4唔係solid...不過都應該照係咁做....

    加油會考- -...我都爆緊CHEM

    資料來源: 小弟10日來的溫習- -
  • 1 十年前

    想更正先頭那人的回答, conc. H2SO4 係liquid state, 但係dilute H2SO4 同其他acid 都係 (aq)。

    同埋 Cl2 (aq) 應該係 very pale green。

還有問題嗎?立即提問即可得到解答。