How many of the six valence electrons in sulfur are used in bonds in sulfur tetrachloride and disulfur difluoride

Astudent pours 10.0 g of salt into a container of water and observes the amount of time it takes for the salt to dissolve. she then repeats the process using the same amounts of salt and water but this time she slowly stirs the mixture while it is dissolving. the student performs the experiment one more time but this time she stirs the mixture rapidly. the dependent variable in this experiment is: time for salt to dissolve speed of stirring amount of water mass of salt

Which compound most likely has the greatest bond energy?

What are fossils of organisms that existed over a wide area but only for a limited time period called?