The force of attraction that holds two atoms together is called a "chemical bond". true or false? if false, what is the right answer? in the "periodic table", dots around an element's symbol indicate the number of valence electrons in an atom. true or false? if false, what is the right answer?

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?

Given the following equation: 2a1 + 3mgcl2 --> 2alcl3 + 3mg how many moles of aluminum chloride are produced from 2.5 moles of magnesium chloride?

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