8/18/2019 Quiz 6 SM1 Chemistry

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CHONG HWA INDEPENDENT HIGH SCHOOL 

CHEMISTRY 

SENIOR MIDDLE LEVEL 1 (XIN / PING) 

=QUIZ 6= 

(Chapter 4)

 Name : _______________________________ Marks: / 14

Write balanced chemical equation(s) based on the chemical reactions described.

1.  Lithium reacts with water to produce colourless solution which turns blue

litmus paper red. [2]

2. 

Sodium is first heated and then lowered into the gas jar filled with oxygen gas.10cm3 of distilled water is then poured into the gas jar which turns blue litmus

 paper red. [4]

3.  Potassium is first heated and lowered into the gas jar filled with bromine gas.

[2]

4. 

Chlorine gas is produced and dissolved in water to form pale yellowish

solution. The solution turns blue litmus paper red and then white. [2]

5.  Bromine vapour is allowed to passed through the red-hot iron wool. It ignites

moderately rapid with brown solid produced. [2]

6.  Iodine crystals are added into cold sodium hydroxide solution to produce

colourless solution. [2]