Question
4x Sulfur (S), oxygen (02), water (H20), and sodium chloride (NaCI) are all examples of pure substances. Which of the following describes all pure substances?
A A pure substance cannot be broken down into simpler substances.
A pure substance is normally found as a solid at room temperature.
一×
A pure substance consists of only one type of element.
D A pure substance has a definite chemical composition.
A A pure substance cannot be broken down into simpler substances.
A pure substance is normally found as a solid at room temperature.
一×
A pure substance consists of only one type of element.
D A pure substance has a definite chemical composition.
Answers
GPT-4o mini
The best choice that describes all pure substances is:
**D. A pure substance has a definite chemical composition.**
This statement accurately reflects that pure substances have a consistent and uniform composition throughout.
Here's a brief explanation of why the other options are not correct:
A. While some pure substances cannot be broken down (like elements), others (like compounds) can be separated into simpler substances.
B. Pure substances can exist in all three states of matter (solid, liquid, gas) at room temperature, not just solid.
C. A pure substance can consist of one type of element (like pure gold) or a combination of elements in a fixed ratio (like water), so this statement is not universally true for all pure substances.
**D. A pure substance has a definite chemical composition.**
This statement accurately reflects that pure substances have a consistent and uniform composition throughout.
Here's a brief explanation of why the other options are not correct:
A. While some pure substances cannot be broken down (like elements), others (like compounds) can be separated into simpler substances.
B. Pure substances can exist in all three states of matter (solid, liquid, gas) at room temperature, not just solid.
C. A pure substance can consist of one type of element (like pure gold) or a combination of elements in a fixed ratio (like water), so this statement is not universally true for all pure substances.