Question

based on the methods used to separate the substance into its parts, is substance u a compound?
yes, it is a compound, because chemical methods were used to separate its parts.
no, it is a mixture, because physical methods were used to separate its parts.
yes, it is a compound, because physical methods were used to separate its parts.
no, it is a mixture, because chemical methods were used to separate its parts.

Explanation:

To determine if Substance U is a compound, recall: Compounds require chemical methods (like reactions) to separate components, while mixtures can be separated by physical methods (like filtration, distillation). If physical methods were used to separate Substance U's parts, it's a mixture. The option "No, it is a mixture, because physical methods were used to separate its parts" matches this logic.

Answer:

No, it is a mixture, because physical methods were used to separate its parts. (Assuming the second option in the display is the correct one with this text; if options are labeled, e.g., B. No, it is a mixture, because physical methods were used to separate its parts, then include the label as per the original question's option labeling.)