Question

Use specific examples from Joseph Priestley’s experiment to explain the relationship between what he observed and what he inferred.

Answer 1

Joseph Priestly observed that a candle alone in a jar did not stay lit for long.

Priestly observed that adding a plant to the jar caused the candle to stay lit longer.

Priestly inferred that plants give off oxygen during photosynthesis, providing the oxygen needed for the candle to burn.

Priestly inferred that the burning candle gave off carbon dioxide, which was used by the plant.

Answer 2

Joseph Priestley is an 18th century natural philosopher who is famous in his experiments in electricity, air, optics and soda water. His works are qualitative rather than quantitative because he does not concern himself with theories but practical applications.
His experiment in electricity through replication of other experiments lead to the publication of his book known as History of Electricity. He observed that electricity conducts through certain materials like coal and that electricity flow from conductors to non-conductors.With this experiments he concluded that conductivity is related to chemical property.
Another experiment that lead to a famous discovery is placing a mice in closed container with mercuric oxide. He concluded that the mice survived sometime because of common air-oxygen. He then  relate oxygen in respiration and its use in the blood.