簡單化學問題簡單化學問題

1.Which of the following statements concerning drugs is INCORRECT?
A.Acetylsalicylate can cause addiction.
B.Magnesium hydroxide can reduce stomach disturbance.
C.Codeine can alleviate coughing.
D.Morphine can relieve pain.

Acetylsalicylate is commonly known as aspirin (阿斯匹靈). It is usually used as a pain killer or used as a blood thinner. It does not cause addiction.
(This topic is out of present HKCEE syllabus.)


2.
1st statement2nd statement
a foam extinguisher is suitable for putting out electrical fires.The foam from a foam extinguisher is an electrical insulator.

The foam in foam extinguisher is on aqueous base. Since aqueous foam is used, a foam extinguisher should not be used to putting out electrical fires in order to prevent electrical shock as aqueous solution can conduct electricity at mains voltage.

1. 請問係咪CE level?
如果係, drugs係out syl
如果唔係, 咁A係答案
acetylsalicylate = aspirin
it won't cause addiction


2. A foam extinguisher is a cylinder containing water, sodium bicarbonate, an agent (often licorice powder) for strengthening the foam, and an inner container of aluminum sulfate powder.

as there are presence of ionic compounds and water
foam extinguisher has high electrical conductivity
therefore it is not suitable for putting out electrical fire