What screening is used to test for lung disease

Which of the following describes a compound? (hint: carbon and oxygen bo a. a piece of pure carbon, containing only carbon atoms b. oxygen gas surrounding a solid piece of carbon c. a substance made of two oxygen atoms for each carbon atom carbon and oxygen atoms mixed without being bonded together

Draw the structure for 5-isopropyl-2-methyl-3-nonene

Which of the following represents the ester functional group? a. -coo- b. -cho c. -cooh d. c=o