* Water (H₂O): The most common example.
* Sodium chloride (NaCl): Table salt, a common ionic compound.
* Carbon dioxide (CO₂): Although it contains carbon, it doesn't contain hydrogen.
* Iron oxide (Fe₂O₃): Rust, a compound of iron and oxygen.
* Ammonia (NH₃): Contains nitrogen and hydrogen, but no carbon.
* Calcium carbonate (CaCO₃): Found in limestone, it contains calcium, carbon, and oxygen.
* Sodium bicarbonate (NaHCO₃): Baking soda, contains sodium, hydrogen, carbon, and oxygen.
As you can see, there are many compounds in the world that do not contain both carbon and hydrogen.
