All of the following are signs of chemical change except

fizzing
sound production
melting
heat production

The element that has the greatest electronegativity is

For the reaction shown, calculate how many moles of no2 form when each of the following completely reacts. 2n2o5(g)→4no2(g)+o2(g) part a 1.0 mol n2o5 express your answer using two significant figures. nothing mol m o l request answer part b 5.4 mol n2o5 express your answer using two significant figures.

What is the compound name for the formula [ru(en)2cl2]2+ and [co(en)cl2br]-