When a sodium atom bonds with a chlorine atom , it acquires positive charge true or false?

Use the standard enthalpies of formation for the reactants and products to solve for the δhrxn for the following reaction. (the δhf of c2h4 is 52.26 kj/mol, co2 is -393.509 kj/mol, and h2o is -241.818 kj.) c2h4 (g) + 3o2(g) 2co2 (g) + 2h2o(g) δhrxn = the reaction is .

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

The continuous release of nuclear energy caused when one fission reaction triggered more nuclear reactions is a