ChromiumCHEMISTRY PROJECT

Class: 5EName: Ho Ka Yu Leung Shu Ting Wong Yuen Ting Yip Chi Chin

BASIC INFORMATION

• Symbol : Cr

• Atomic Number : 24

• Name Origin: From the Greek word chr maó̱�

• Obtained From: Chromite

• Discovered By : Nicholas Louis Vauquelin

PROPERTIES• a lustrous steel-gray color which takes a high polish

• hard and resistant to corrosion

• has a high melting point, stable crystalline structure, and

moderate thermal expansion.

• All chromium compounds are colored.

• Chromium compounds are toxic.

USE OF CHROMIUM

IN OUR DAILY LIFE

• Drilling Mud

- prevent corrosion of steel under wet condition

• Laboratory Glassware

- chromic acid is a powerful oxidizing agent

• Wood Preservative

- protect wood from decay fungi, wood attacking insects

• Metallurgy

- Decorative chrome plating on a motorcycle

• Dye and Pigment

- used for school bus in the US and Postal Service in Europe

• Tanning

- stabilizes the leather by linking the collagen fibre

HEALTH EFFECTS• Shortages may cause heart conditions, disruptions of

metabolisms and diabetes

• Uptake of chromium (III) can cause instance skin rashes

• Chromium (VI) in leather products can cause allergic

reactions

• Breathing in chromium (VI) can cause nose irritations

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