Ou were instructed to rinse the filter pipettes with methanol and with hexane. obviously thereason for this is to remove any contaminants that may be present on the glass or cotton. usingwhat you learned about the physical properties of organic compounds in 40a, why were thesolvents methanol and hexane chosen

As you move from right to left on the periodic table the atomic radius fill in the blank

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? a. the balloons both rise. the cold balloon is larger than the warm balloon. b. the balloons rise at the same rate. both balloons are the same size. c. the warm balloon expands and rises. the cold balloon shrinks and sinks. d. the cold balloon expands and rises. the warm balloon shrinks and sinks.

•hydration •dissociation •dissolving which one goes to which