Question

Classify each of the following pure substances as an element or a compound.
methane (CH4) in natural gas
a silicon (Si) chip
hydrogen peroxide (H202)
oxygen gas (0,)
Rust (Fe2O3

Answer 1

methane (CH4) in natural gas - compound
a silicon (Si) chip - element
hydrogen peroxide (H202) - compound
oxygen gas (O2) - element
Rust (Fe2O3) - compound