1. S.5D Ng Hoi Yi (12) Pang Sze Yan (15) Tong Hoi Yi (22)

2.   Industrial use  Medical use  Biological Use

3.  1) An anti-corrosion agent (most commonly)  Galvanization (55%)  Used on …...  chain-link fencing  guard rails  suspension bridges  lightposts  metal roofs  heat exchangers Hot-dip handrail galvanized crystalline surface  car bodies Industrial Use

4.  2) An efficient sacrificial anode in cathodic protection  Acts as the anode  Protect metals that are exposed to sea water from corrosion iron T-Bolt without/with cathod ic protection Industrial Use

5.  3) Alloy (Brass)  More ductile and stronger  Superior corrosion resistance  Useful in … …  communication equipment  hardware  musical instruments  water valves Cast brass microstructure at magnification 400x Industrial Use

6.  4) Zinc-air batteries  Electro-chemical batteries  High energy densities  Relatively inexpensive to produce  Useful in … …  electric vehicle propulsion Zinc -air button cell  film camera Industrial Use

7.  1) Dietary supplement  Single tablet over-the-counter daily vitamin & mineral supplements  Protect against … …  accelerated aging of the skin  muscles of the body  Speed up the healing process Medical Use

8.  2) Cure diseases  Effective treatment for … …  Age-related macular degeneration ( 老年黃斑點病變 )  Acrodermatitis enteropathica  Protect against … …  Diaper rash ( 尿布疹 )  Sunburn & Windburn Medical Use

9.  1) Enzyme  A useful catalytic agent  Necessary for …...  plants  animals  microorganisms  Coordinate to the amino acid side chains of … …  aspartic acid  glutamic acid  cysteine and histidine. Biological Use

10.  2) In human body  2–4 grams distributing throughout the human body  brain  muscle  bones  kidney  liver  prostate  parts of the eye. Biological Use