化學的問題(請進)

Firstly we have to note how to distinguish from mixtures(混合物) and compounds(化合物):

Mixtures:

.Make up with 2 elements or more

eg. Cl2 (2 Chlorines)
.Easily to be broken down/Easily to separate them
.Mixtures is when elements MIX together but don't have a CHEMICAL REACTION
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Compounds:

.Make up with 2 different elements or more/Two or more different elements bond together

eg. H2O (2 Hydrogens and 1 Oxygen)
CuSO4 (1 Copper 1 Sulphur 4 Oxygens)

.Chemical reaction occurs
.Nearly impossible to separate them/Nearly impossible to break them down
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.Mixtures don't have a fixed proportion. Since they are just mixed up, 1 element can join up to 10 elements or maybe 2 elements can join up to 11 elements.

.Compounds have a fixed proportion as shown on their chemical symbols.

2009-01-02 14:23:20 補充：
Hope this would be useful for you :-)!

2009-01-02 17:09:55 補充：
Mixtures are just mixing together without a chemical reaction, thus no new substance is formed.

Compound is a newly formed substance where two elements bond together, with a chemical reaction to form a compound.

化合物
化合物是由兩種或以上的元素組成

組成後,其化學性質會改變,並組成新的物質
eg鎂係金屬,導電
氧助燃
組成化合物(氧化鎂)

但生成的化合物(氧化鎂)不能導電,不能助燃
其化學性質會改變,並組成新的物質,所以氧化鎂是化合物

混合物是由兩種或以上的元素組成
組成後,其化學性質不會改變,並沒有組成新的物質

eg水+糖

組成混合物糖水,糖水即是水+糖,沒有組成新的物質,其化學性質也沒有改變,
所以水+糖是混合物

2009-01-02 16:31:14 補充：
合金只是把兩種或以上的金屬混合

組成合金,但沒有組成新的物質,因此合金是混合物

2009-01-02 16:31:45 補充：
其化學性質也沒有改變

混合物係兩種5同ge物質組成而化合物係兩種5同ge元素組成,好似你講ge焊鍚咁,佢係喺鍚入面再加入鉛,兩者冇發生過反應,所以只可以話係兩種5同ge物質而5可以話係兩種5同ge元素。