Phlogiston and Oxygen

The video explores the transition from the flogiston theory to modern chemistry. It begins with Priestley's discovery, which lacked significance until Lavoisier's precise experiments. Lavoisier's work debunked the flogiston theory by demonstrating that substances gain mass when heated, leading to the discovery of oxygen. This marked a turning point in chemistry, establishing the modern concept of chemical elements and earning Lavoisier the title of the father of modern chemistry.

What was the substance called that was believed to be released during combustion according to the mistaken view of the time?

• Carbon Dioxide

• Hydrogen

• Flogiston

• Oxygen

What did Lavoisier observe when he heated tin, contrary to the flogiston theory?

• The tin evaporated

• The tin gained mass

• The tin remained unchanged

• The tin lost mass

What was Lavoisier's conclusion about the gas absorbed by substances during combustion?

• It was a new element called oxygen

• It was irrelevant to the reaction

• It was a mixture of gases

• It was a known element

Which experiment did Lavoisier perform in reverse to verify Priestley's findings?

• Heating of water

• Heating of lead

• Heating of tin

• Heating of mercury oxide

Who is known as the father of modern chemistry due to his contributions to the understanding of chemical elements?

• Joseph Priestley

• Antoine Lavoisier

• Robert Boyle

• Dmitri Mendeleev