2008-10-11 09:15
哇三次
F.4 CHEM@USE頭20隻elements....!?
USE 頭20隻 elements .
a . Name TWO elements which are obtained from fractional distillation of liquid air .
b . Why does argon consist of individual atoms instead of molecules of two or more atoma?
c . Carbon combines with element X to form a covalent compound with the formula CX2.
i.) To which group does X belong?
ii.) Draw an electron diagram for the compound, showing electrons in the outermost shells
only.
d . Element Y forms a nitrate which has the formula Y(NO3)2 .
i.) To which group does Y belong ?
ii.) Predict the formula for the oxide of Y .
2 the following table gives some information about W , X , Y and Z which represent particles of some
elements . These particles are either atoms or ions .
Particle Mass NO. Atomic NO. protons electrons neutrons
W 14 7 7
X 9 9 10
Y 9 10 10
Z 10 19 20
* 空白左個D係UNKOWN.
a . W exisits as diatomic molecules . Draw an electron diagram for itsmolecule , showing electrons in
the outermost shells only.
b .
i.) What is the relationship between X and Y ?
ii.) Suggest a chemical reaction in ehich X can change into Y .
c . X can form a compound whit Z .
i.) Draw an electron diagram for the compound .
ii.) Calculate the formula mass of the compound .
2008-10-11 13:37
magiyafeimo
USE 頭20隻 elements .
a . Name TWO elements which are obtained from fractional distillation of liquid air .
oxygen and argon
b . Why does argon consist of individual atoms instead of molecules of two or more atoma?
argon has an ouetrmost electron with 8, so it is stable in nature with only a single atom and does not need to have molecules of two or more atoms.
c . Carbon combines with element X to form a covalent compound with the formula CX2.
i.) To which group does X belong? group 6
ii.) Draw an electron diagram for the compound, showing electrons in the outermost shells
only.
.. ..
: X : : C : : X :
d . Element Y forms a nitrate which has the formula Y(NO3)2 .
i.) To which group does Y belong ? group 2
ii.) Predict the formula for the oxide of Y. YO
[[i] 本帖最後由 magiyafeimo 於 2008-10-11 13:43 編輯 [/i]]
2008-10-11 14:46
哇三次
I have one more question.
2008-10-11 17:15
magiyafeimo
2 the following table gives some information about W , X , Y and Z which represent particles of some
elements . These particles are either atoms or ions .
Particle Mass NO. Atomic NO. protons electrons neutrons
W 14 7 7 7 7
X 19 9 9 9 10
Y 19 9 9 10 10
Z 10 19 20
* 空白左個D係UNKOWN.
a . W exisits as diatomic molecules . Draw an electron diagram for itsmolecule , showing electrons in
the outermost shells only.
. W .
...
...
. W .
b .
i.) What is the relationship between X and Y ? y is an ion of x
ii.) Suggest a chemical reaction in ehich X can change into Y .
X + Na= y + (Na)+
c . X can form a compound whit Z .
i.) Draw an electron diagram for the compound .
i think z should have some error in the table, proton and electron differs so much like that? 10 and 19?
ii.) Calculate the formula mass of the compound .
[[i] 本帖最後由 magiyafeimo 於 2008-10-11 17:20 編輯 [/i]]
2008-10-12 10:22
哇三次
[quote]原帖由 [i]magiyafeimo[/i] 於 2008-10-11 17:15 發表 [url=http://www2.3boys2girls.com/redirect.php?goto=findpost&pid=27270911&ptid=425946][img]http://www2.3boys2girls.com/images/common/back.gif[/img][/url]
2 the following table gives some information about W , X , Y and Z which represent particles of some
elements . These particles are either atoms or ions .
Particle Mass N ... [/quote]
Z 's protons is 19
and the Q.bii 's formula is it?
X + Na = Y + (Na)+
WHY?
and the electron diagram (a),I don't understand what this mean?
. W .
...
...
. W .
係唔係一個W既outermost shell有5粒electrons?
[[i] 本帖最後由 哇三次 於 2008-10-12 10:31 編輯 [/i]]
2008-10-12 10:37
哇三次
c . Carbon combines with element X to form a covalent compound with the formula CX2.
i.) To which group does X belong? group 6
[color=Red]Why X is in group 6?[/color]
ii.) Draw an electron diagram for the compound, showing electrons in the outermost shells
only.
.. ..
: X : : C : : X :
X has 6 electrons in the outermost shell?
C has 4 electrons in the outermost shell?
[color=Red]I don't understant . -3-[/color]
[[i] 本帖最後由 哇三次 於 2008-10-12 17:47 編輯 [/i]]
2008-10-12 18:07
magiyafeimo
Z 's protons is 19
and the Q.bii 's formula is it?
X + Na = Y + (Na)+
WHY?
X變Y,變成anion多左粒電子
可以找group 1 的金屬俾佢1粒電子例如Na鈉
and the electron diagram (a),I don't understand what this mean?
. W .
...
...
. W .
係唔係一個W既outermost shell有5粒electrons? yes
if Z has proton of 19 then Z is not an ion
then its outermost electron is 1
then
c . X can form a compound whit Z .
i.) Draw an electron diagram for the compound .
[Z]+ [X]-
ii.) Calculate the formula mass of the compound .
z's mass = 20 +19=39
x's mass = 9+10=19
compound=39+19=58
[[i] 本帖最後由 magiyafeimo 於 2008-10-12 18:28 編輯 [/i]]
頁:
[1]
Powered by Discuz! Archiver 5.5.0
© 2001-2006 Comsenz Inc.