Incandescent Light Bulb

The video tutorial explains the properties and uses of noble gases, focusing on their unreactivity. It demonstrates an experiment comparing the behavior of tungsten wire in air and argon, highlighting the benefits of using argon to prevent oxidation and produce light. The tutorial also discusses the application of noble gases in airships, emphasizing the safety of helium over hydrogen.

Which group of elements is known for their lack of reactivity under normal conditions?

• Alkali metals

• Halogens

• Noble gases

• Transition metals

What materials are needed to demonstrate the unreactivity of noble gases in the experiment?

• Argon, tungsten wire, carbon electrodes, conical flask, DC power supply

• Krypton, iron wire, metal electrodes, jar, solar panel

• Helium, copper wire, glass electrodes, beaker, AC power supply

• Neon, silver wire, plastic electrodes, test tube, battery

Which noble gas is used in the experiment to demonstrate its unreactivity?

• Xenon

• Argon

• Neon

• Helium

What happens to the tungsten wire when the conical flask is filled with air and the power supply is turned on?

• The wire melts slowly

• The wire breaks immediately

• The wire remains unchanged

• The wire glows indefinitely

Why does the tungsten wire last longer when the flask is filled with argon?

• Argon cools the wire

• Argon reacts with tungsten

• Argon prevents oxidation

• Argon increases the current

What is the main reason helium is preferred over hydrogen in modern airships?

• Helium is non-flammable

• Helium is more abundant than hydrogen

• Helium is cheaper than hydrogen

• Helium provides more lift

What was a major risk associated with using hydrogen in early airships?

• Hydrogen is too heavy

• Hydrogen is highly flammable

• Hydrogen is too expensive

• Hydrogen is not buoyant enough