Lavoisier's Experiment and Gas Analysis

The video tutorial explains Lavoisier's classic experiment where mercury(II) oxide is heated to produce mercury metal and oxygen gas. The process involves heating a sample of red mercury(II) oxide, which decomposes into mercury metal and oxygen gas. The mercury metal condenses as a metallic gray ring in the test tube, while the oxygen gas is collected by displacing water. The presence of oxygen is confirmed by introducing a glowing splint into the test tube, which reignites due to the combustion acceleration in oxygen.

What is the main chemical compound used in Lavoisier's classic experiment?

• Calcium carbonate

• Sodium chloride

• Mercury(II) oxide

• Potassium permanganate

What are the products formed when mercury(II) oxide is heated?

• Sodium and chlorine gas

• Mercury metal and oxygen gas

• Water and carbon dioxide

• Hydrogen gas and water

How is the oxygen gas collected during the experiment?

• By displacement of water

• By condensation

• By sublimation

• By filtration

What visual evidence indicates the presence of mercury metal in the test tube?

• A green solution

• A white powder

• A blue precipitate

• A metallic gray ring

How can the collected gas be confirmed as oxygen?

• By using litmus paper

• By its smell

• By using a glowing splint

• By measuring its density