REVISION 2 SCIENCE FORM 3

What is the function of adding alum in the water supply system?

• Reduce acidity of the water

• Get rid of the bad odour

• Coagulate the large particles

• Filter out the large particles

· React with metal to produce hydrogen gas

· Turn universal indicator to red

· High concentration is corrosive

The above statement refer to

• Distilled water

• Orange juice

• Broccoli

• Salt

· Do not react with metal

· Turn methyl orange indicator into yellow

· High concentration is corrosive

The above statement refer to

• Detergent

• Honey

• Sugar

• Coffee

What will happen to the phenolphthalein solution in sodium hydroxide solution if hydrochloric acid is added into it?

• Remain pink

• Turn to blue

• Become colourless

• Turn to green

A solution with pH 2 is ..

• Weak alkaline

• Strong alkaline

• Weak acid

• Strong acid

A solution with pH 7.5 is …

• Weak alkaline

• Strong alkaline

• Weak acid

• Strong acid

What type of shampoo is good to be used for scalp?

• Acidic

• Alkaline

What are the products of neutralization?

• Acid and water

• Alkaline and water

• Salt and water

• New solution

What will happen to dry cobalt chloride paper if it is put on dry detergent powder?

• Change from blue to pink

• Change from pink to blue

• Blue colour remains unchanged

• Pink colour remains unchanged

What is the type of energy possessed in the picture?

• Kinetic energy

• Potential energy

• Chemical energy

• Heat energy