I recommend these two papers:
How Similar Are Similarity Searching Methods? A Principal Component Analysis of Molecular Descriptor Space
J. Chem. Inf. Model., 2009, 49 (1), pp 108–119 (http://pubs.acs.org/doi/abs/10.1021/ci800249s)
How Diverse Are Diversity Assessment Methods? A Comparative Analysis and Benchmarking of Molecular Descriptor Space
J. Chem. Inf. Model., 2014, 54 (1), pp 230–242 (http://pubs.acs.org/doi/abs/10.1021/ci400469u)
Hi, Phuc. PubChem's data contents are updated on a daily basis, so it is not unusual to see a small variation in the number of returned records. I've tried the question again and I got the same number of hits as yours. So, consider that the number 16 stated in the question is an approximate number that may vary.
[I added that number as a reference. If a student get an answer that is way off 16, there is a possibility that he or she is doing something wrong. However, if the discrepancy is small, you can consider it's because PubChem's information has been updated.]
How would one load this page to a google sheet? https://pubchem.ncbi.nlm.nih.gov/rest/pug_view/annotations/heading/XML/?heading=Boiling+Point&response_type=display
I am assuming you place this in a cell (D52) https://pubchem.ncbi.nlm.nih.gov/rest/pug_view/annotations/heading/XML/?heading=Boiling+Point
And then something like =IMPORTXML(D52"//XPath_query")
But I do not know the XPath_query, or how to understand the Xpath_query
I recommend these two papers:
How Similar Are Similarity Searching Methods? A Principal Component Analysis of Molecular Descriptor Space
J. Chem. Inf. Model., 2009, 49 (1), pp 108–119 (http://pubs.acs.org/doi/abs/10.1021/ci800249s)
How Diverse Are Diversity Assessment Methods? A Comparative Analysis and Benchmarking of Molecular Descriptor Space
J. Chem. Inf. Model., 2014, 54 (1), pp 230–242 (http://pubs.acs.org/doi/abs/10.1021/ci400469u)