No.
Hydrocarbons are composed entirely of carbon and hydrogen.
That's a reasonable description of a "hydrocarbon"
Ribulose is composed of a 5 carbon chain.
Carbon is a type of atom.
The atmosphere of Mars is much less dense than that of Earth and is composed almost entirely of carbon dioxide. Earth's atmosphere is mostly nitrogen and oxygen.
Yes, for example, there's diamond which is composed entirely of the element carbon or sulfur which composed entirely of (yup... you guessed it) sulfur.
Hydrocarbons are composed entirely of carbon and hydrogen.
When it is on fire, the fire lets off carbon dioxode
No. Sugar is composed entirely of carbon, hydrogen, and oxygen.
Dry ice is the solid form of carbon dioxode, CO2.
That's a reasonable description of a "hydrocarbon"
The 3 allotropes of Carbon are: Graphite, Diamonds, and Buckminsterfullerenes (Bucky Balls). They are composed entirely of Carbon but have different structural aspects.
50% of carbon dioxode is released burnind coal
Yes. Diamond, for example, is composed entirely of carbon atoms.
Venus. Its atmosphere is almost entirely composed of carbon dioxide. It is so hot that its oceans boiled dry.
Mostly sulphur and carbon dioxode comes out of a power station that burns fossil fuels. But there are some other gases
No, graphite is a mineral and is composed entirely of Carbon atoms. Wood is a living material which contains celulose, among other substances, when it is burned the remains do contain carbon but there are also other elements present.