In a spontaneous reaction - a) the reaction happens very quickly b) additional heat is required to make it occur. c)no additional heat is required to make it occur. d) additional heat is absorbed from the environment.

There are 6.022, 104 atoms of hg in 1 mole of hg the number of atoms in 45 moles of hg can be found by multiplying 4.5 by 6.022, 102 which is the number of atoms in 4.5 moles of hg, correctly written in scientific notation with the correct number of significant figures? 0 21,109 0 21,100 271, 1024 27.099, 100 mark this and retum save and exit submit

Which item is most likely part of the safety contract

Which statement accurately represents the arrangement of electrons in bohr’s atomic model?