1. The elements in the compound were uncombined and could easily be separated.
2. The uncombined chemicals reacted violently when mixed together.
3. The uncombined molecules of hydrogen and oxygen were present in the air.
4. The uncombined atoms of carbon and oxygen were highly unstable.
5. The uncombined metals formed a layer of residue at the bottom of the container.
6. The uncombined particles were difficult to detect without specialized equipment.
7. The uncombined elements had distinct properties that could be observed under a microscope.
8. The uncombined substances were carefully measured and mixed in precise proportions.
9. The uncombined gases were released into the atmosphere during the chemical reaction.
10. The uncombined compounds were analyzed in the laboratory to determine their composition.