Question: Sulfur (S), oxygen (O2), water (H2O), and sodium chloride (NaCl) are all examples of pure substances. Which of the following describes all pure substances?
Options:
A pure substance consists of only one type of element.
A pure substance has a definite chemical composition.
A pure substance cannot be broken down into simpler substances.
A pure substance is normally found as a solid at room temperature.
Answer: A pure substance has a definite chemical composition.