a substance made of two or more elements chemically combined in a set ratio or proportion is called what

A substance made of two or more elements chemically combined in a set ratio or proportion is called a compound.

To determine if a substance is a compound, you can follow these steps:

1. Identify the elements present in the substance.
2. Determine the ratio or proportion in which the elements combine.
3. Check if the elements are chemically bonded together, meaning they share electrons.
4. If the elements meet these criteria, the substance is a compound. Otherwise, it may be a mixture of elements or a pure element.

Chemical formulas, such as H₂O (water) or CO₂ (carbon dioxide), represent compounds and indicate the types and ratios of elements present.

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