Question

1. compounds that contain only carbon and hydrogen are ______.

○ fossil fuels
○ hydrocarbons
○ organic fuels
○ renewable fuels

Explanation:

Hydrocarbons are defined as organic compounds composed exclusively of carbon and hydrogen atoms. Fossil fuels are a type of fuel that may contain other elements alongside C and H, organic fuels include a broader range of organic compounds (not just C and H), and renewable fuels are categorized by their renewability, not elemental composition.

Answer:

○ hydrocarbons