What is the chemical symbol for carbon?
AnswerC
Carbon's symbol is C; Ca is calcium, Co is cobalt and Cr is chromium.
Science · Facts & stats
Carbon facts & stats
7 fact-checked facts about carbon, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
Which gas do plants take in from the air for photosynthesis?
AnswerCarbon dioxide
Plants use carbon dioxide, water and sunlight to make sugars, releasing oxygen.
Going deeper
Dry ice changes directly from a solid to a gas. What is this process called?
AnswerSublimation
Solid carbon dioxide sublimes at about -78.5°C at normal pressure, skipping the liquid state.
What is the branch of chemistry that studies carbon compounds called?
AnswerOrganic chemistry
Organic chemistry studies carbon-based compounds, including those that make up living things.
Which carbon mineral is rated 10, the top of the Mohs hardness scale?
AnswerDiamond
Diamond is the hardest natural mineral, at 10 on the Mohs scale.
Expert level
About how long is the half-life of carbon-14, used in radiocarbon dating?
AnswerAbout 5,730 years
After about 5,730 years half the carbon-14 in a sample has decayed, which lets scientists date once-living material.
The Keeling Curve is a famous record of what?
AnswerCarbon dioxide in the air, measured at Mauna Loa
Measurements begun by Charles David Keeling in 1958 track atmospheric CO2 at the Mauna Loa Observatory.
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