Given the reaction:
ch4(g) + 2 o2(g) --> 2 h2o(g) + co2(g)
what is the overall result when ch4(g) burns
according to this reaction?
(1) energy is absorbed and dh is negative.
(2) energy is absorbed and dh is positive.
(3) energy is released and dh is negative.
(4) energy is released and dh is positive.

What energy conversion occurs when a sling shot is used to shoot a rock across the room? (2 points) question 2 options: 1) stored mechanical energy is converted to mechanical energy. 2) stored mechanical energy is converted to radiant energy. 3) gravitational energy is converted to radiant energy. 4) gravitational energy is converted to mechanical energy.