Electrolysis and Gas Tests

The video tutorial explains how to identify gases produced in electrolyzer columns by observing bubble production and gas volumes. It details the electrolysis process, including the half reactions at the anode and cathode. The video also demonstrates tests to identify hydrogen and oxygen gases, highlighting hydrogen's flammability and oxygen's ability to reignite a glowing splint.

What indicates that the black storage column contains hydrogen?

• It is connected to the cathode.

• It has fewer bubbles than the red column.

• It has more bubbles than the red column.

• It is connected to the anode.

What is the ratio of hydrogen to oxygen molecules produced in water decomposition?

• 1:1

• 1:2

• 3:1

• 2:1

Where does the net reaction of water decomposition occur in the electrolyzer?

• Only at the anode

• In the electrolyte

• Only at the cathode

• At both the anode and cathode

What happens to electrons at the cathode?

• They remain unchanged.

• They are lost to the electrolyte.

• They combine with water molecules.

• They are gained by the anode.

Which product is formed at the anode during electrolysis?

• Hydrogen

• Oxygen

• Water

• Hydroxide ions

What sound is expected when hydrogen is ignited in a test tube?

• A crackle

• A hiss

• A pop

• A whistle

Why is hydrogen considered less dense than air?

• It is denser than oxygen.

• It is heavier than air.

• It is lighter than air.

• It has the same density as air.

What is the purpose of using a glowing splint in the oxygen test?

• To measure the temperature

• To absorb the gas

• To reignite and confirm oxygen presence

• To check for hydrogen

How is oxygen collected in the test tube?

• By using a vacuum

• By heating the test tube

• By displacing water

• By cooling the test tube

What indicates the presence of oxygen in the test tube?

• The splint extinguishes

• The splint remains unchanged

• The splint glows dimly

• The splint reignites