Compounds are different from mixtures in that the elements in compounds are chemically combined. This means that the elements in a compound are held together by chemical bonds, resulting in a substance with a specific chemical formula and properties. In contrast, mixtures are combinations of substances that are physically mixed together but not chemically bonded.
For example, water (H2O) is a compound because it is made up of hydrogen and oxygen atoms that are chemically bonded together. On the other hand, a mixture like a salad is made up of various ingredients like lettuce, tomatoes, and cucumbers that are physically mixed together but retain their individual properties.
Therefore, the correct option is OD: The elements in compounds are chemically combined.
