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which observation would best support that the bond present was a covalent bond?
a) the compound present contains a nonmetal.
b) carbon and oxygen share pairs of valence electrons.
c) aluminum is contained in a compound and forms a cation.
d) the valence electrons are involved in the bonding between atoms.

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