F4 chem 小問題

1)請問copper係咪magnetic?

Copper is NOT magnetic.
(A metal is said to be magnetic only when the metal can be attracted by a magnet. Among all common metals in Form 4, only iron and nickel are magnetic.)


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2)glucose係咪acidic?

Glucose is neutral.
(Each glucose molecule contains 5 -OH groups, which CANNOT ionize in water to give hydrogen ions or hydroxide ions. Therefore, glucose solution is neither acidic nor alkaline.)


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3)glucose 可否 speed up rusting?

Glucose CANNOT speed up rusting.
(Mobile ions in some solutions (electrolytes) can speed up rusting. However, glucose solution does not contain mobile ions and thus CANNOT speed up rusting.)

1) YES

copper is metal and therefore it is magnetic .

2) NO


Glucose is a monosaccharide (simple sugar) with formula C6H12O6 or H-(C=O)-(CHOH)5-H, whose five hydroxyl (OH) groups are arranged in a specific way along its six-carbon backbone.

Glucose is a neutral organic substance.

It does contain -OH groups, but they do not dissociate so do not cause a difference in pH.


2011-01-28 20:23:12 補充：
3) No.