What are the difference between ionic bond and covalent bond?

Which is stronger?​

1) these are barrel shaped microtubules in most animal cells, that organize the spindles during cell division

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

What is the percentage of hydrogen in c2h4