oxygen
Oxygen is element 8. This topic is part of Chemistry within Science & Nature. This page currently draws on 97 supporting questions, with answers and bonus facts available below.
oxygen trivia questions
What is the chemical symbol for oxygen?
Answer: O
Bonus fact: Oxygen is element 8.
About what percentage of Earth's atmosphere is oxygen?
Answer: 21%
Bonus fact: Oxygen makes up about one-fifth of dry air.
What molecule do humans mainly breathe from the atmosphere?
Answer: O2
Bonus fact: Ordinary atmospheric oxygen is diatomic O2.
What process produces charcoal by heating organic material without enough oxygen for full burning?
Answer: Pyrolysis
Bonus fact: Pyrolysis decomposes material thermally.
Anemia commonly involves too little of what oxygen-carrying substance?
Answer: Hemoglobin
Bonus fact: Low hemoglobin reduces oxygen transport.
Which arteries are unusual because they normally carry oxygen-poor blood?
Answer: Pulmonary arteries
Bonus fact: Pulmonary arteries carry oxygen-poor blood from the right side of the heart to the lungs.
In chemistry, an ether contains an oxygen atom bonded to how many carbon-containing groups?
Answer: Two
Bonus fact: Ethers have the general structural pattern R–O–R′.
What process causes a substance to burn by reacting rapidly with oxygen?
Answer: Combustion
Bonus fact: Combustion is a rapid oxidation reaction that releases heat and often light.
Which part of a candle flame is often hottest because fuel and oxygen mix most effectively there?
Answer: Outer zone
Bonus fact: The outer region of a candle flame generally has more complete combustion and higher temperatures.
Why is adding oxygen to a fuel torch flame useful in metalworking?
Answer: It raises the flame temperature
Bonus fact: Oxygen supports more intense combustion and higher temperatures.
The prefix di- in dioxide means how many oxygen atoms?
Answer: Two
Bonus fact: Carbon dioxide is CO2.
What process lets yeast convert sugars into alcohol and carbon dioxide without oxygen?
Answer: Fermentation
Bonus fact: Alcoholic fermentation is central to bread and brewing.