Question

what is the primary objective of the \synthesis and analysis of alum investigations\ lab?
select one:

to memorize the physical properties of all the substances in table al.1.

to synthesize a large sample of alum.

to repeat the week 1 experiment to get a better percent yield.

to design an experiment that uses physical properties to identify an unknown substance.

Explanation:

In a lab titled "Synthesis and Analysis of Alum Investigations", the key is on the analysis part. Memorizing properties (just rote learning) is not a primary lab - objective. Synthesizing a large sample is more about synthesis (a part - but not the main analysis - related objective). Repeating for better yield is more about optimization of a synthesis process. Designing an experiment to use physical properties (like solubility, melting point etc. which are analyzed) to identify an unknown is in line with the "analysis" aspect of the lab title.

Answer:

To design an experiment that uses physical properties to identify an unknown substance.