4. What is the percentage of nitrogen, by mass, in calcium nitrate? (a) 8.54%, (b) 17.1%, (c) 13.7%, (d) 24.4%, (e) 82.9%.

*tilts head* sounds more like a statement

why do the isotopes of a particular element behave differently in nuclear reactions but the same in chemical reactions? chemical reactions involve changes to electrons in an atom; isotopes do not differ in electrons, and so they react the same way during chemical changes.

c. 75.7

i think that is the right

conduction is the transfer of thermal energy (heat in transfer) due to collisions between the molecules in the object. collisions between adjacent atoms and molecules transfer kinetic energy from the warmer to the cooler object. the objects must be in physical contact.