Video Transcript
Blank is the chemical analysis used to identify the constituents of a substance and whether it is pure or a mixture of several substances. (A) Functional analysis, (B) purification analysis, (C) qualitative analysis, or (D) quantitative analysis.
Chemical analysis is used to identify and quantify the substances in a material or mixture. Let’s go through the answer choices in turn to see which are relevant.
Option (A) is functional analysis. This is actually a branch of mathematical analysis, so it’s not especially relevant to chemistry and is not the answer to this question.
Option (B) is purification analysis. Although purification may be used in analysis, purification analysis is not a recognized branch of chemical analysis. So option (B), purification analysis, is not the answer to this question.
Both options (C) qualitative analysis and option (D) quantitative analysis are types of chemical analysis. So either option (C) or option (D) is the answer to this question. Qualitative analysis methods are used to identify substances in chemical species, whereas quantitative analysis methods are used to determine the abundances of elements and compounds in chemical species. As qualitative analysis methods involve identifying substances, these methods can be used to determine what substances have combined together to make a mixture, whereas since quantitative analysis methods determine the abundances of substances, quantitative analysis methods can be used to determine mass, percentage composition, and concentration.
We need to figure out which type of chemical analysis is used to identify constituents of a substance. This is most similar for the definition of qualitative analysis. The type of chemical analysis also needs to be able to determine whether a substance is pure or a mixture of several substances. Again, this is something that can be done by qualitative analysis. So it seems as though option (C), qualitative analysis, is the correct answer.
So the answer to the question “Blank is the chemical analysis used to identify the constituents of a substance.” is (C) qualitative analysis.
