Joseph Priestley conducted several experiments that contributed significantly to the understanding of gases and the process of photosynthesis. Based on his findings, the following choices can be identified as proven by his experiments:
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A flame requires oxygen to burn - This is true and was demonstrated by Priestley in his experiments where he conducted the candle-in-a-jar experiment, showing that a candle extinguished when the oxygen was used up.
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Carbon dioxide is essential to fire - This statement is not accurate based on Priestley's work. While he studied gases that are produced from combustion and respiration, he did not prove that carbon dioxide is essential for fire.
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Photosynthesis absorbs oxygen from the environment - This is not accurate. Priestley's experiments did not establish that photosynthesis absorbs oxygen; instead, he found that certain processes produced oxygen.
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The process of photosynthesis releases oxygen into the environment - This statement is true. Priestley's experiments with plants demonstrated that they could produce oxygen (from carbon dioxide) when exposed to light, supporting the concept that plants release oxygen as a byproduct of photosynthesis.
So the correct answers are:
- A flame requires oxygen to burn
- The process of photosynthesis releases oxygen into the environment
1 answer