Question

Observations are things that can be perceived with senses (i.e., sight, sound, smell, taste, and touch).

Inferences are decisions based on what was observed.

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

Answer 1

Joseph Priestley was a famous philosopher of the 18th century, who is famous for his experiments with the air, optics, electricity and soda water. His work was considered to be quantitative because he believes in practical application.

His experiment that leads to the famous discovery of placing a mice in a closed container with the mercuric oxide. He comes to know that mice survived because of common air-oxygen. He then finds the use of oxygen in the process of respiration and its use in the blood.

Answer 2

Sample Answer

What did you include in your response?

• 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.