19-2

1 (NH 4 ) 2 Cr 2 O 7 (s) > Cr 2 O 3 (s) + N 2 (g) + 4H 2 O(g) 2. It made a new substance 3.exothermic 4.it left into heat energy and gas 5.right 6.negative 7.because its gaining heat energy 8.yes