The picture shows a periodic table with elements X and Y. If the atomic number of element X is 3, then what is the atomic number of element Y?
A. 5
B. 7
C. 19
D. 25

In a heat engine of 1000 j of heat enters the system and the piston does 500 j of work what is the final internal energy of the system if the inital energy was 2000 j we have to do all of these down here 1)write the equation 2)list out your know variables 3)plug the numbers into the equations 4)solve 5)write your solution statemtn that includes inital energuy and final energuy added

An unknown insoluble substance displaced the water shown. it's mass is indicated on the triple beam balance. mass = a. 694 b. 693.5 c. 693.0 d.693.8

Write the overall equation for the reaction occurring in lithium battery?