Chemistry Practical Quiz

Why is it important to wear safety glasses during the experiment?

• To look cool

• To protect eyes from harmful chemicals

• To avoid getting wet

• To see better

What color precipitate is formed when testing for aluminium ions?

• Blue

• Green

• Brown

• White

How can you differentiate between calcium and aluminium precipitates?

• By heating the solution

• By adding more sodium hydroxide

• By adding water

• By shaking the test tube

What color precipitate is formed when testing for copper ions?

• Blue

• White

• Brown

• Green

What color precipitate does iron (II) form?

• Blue

• White

• Brown

• Green

What happens to iron (II) hydroxide when exposed to air?

• It turns blue

• It dissolves

• It evaporates

• It darkens and becomes brown

Tags

NGSS.MS-PS1-2

What color flame does lithium produce?

• Crimson red

• Blue-green

• Lilac

• Orange

Which ion causes a lilac flame?

• Calcium

• Copper

• Potassium

• Sodium

What is the characteristic smell of ammonia?

• No smell

• Fishy

• Sour

• Sweet

What happens to red litmus paper in the presence of ammonia?

• It stays the same

• It dissolves

• It turns red

• It turns blue