What does the electronegativity of an atom indicate? A.
The tendency of the atom to pull on electrons
B.
The measurement of the charge of an ion
C.
The effect the valence electrons have on core electrons
D.
The energy required to gain or lose an electron

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

The molar mass of iron(fe) is 55.8 g/mol. what is the mass in grams of 2.25 moles of iron?

Stoichiometry- i need with 14 and 15! an explanation would be appreciated!