Consider the chemical equations shown here. 2H2(g) + O2(g) → 2H2O(g) AH, = -483.6 kJ - 2 = -241.8 kJ/mol
302(g) → 20,(9) AH, = 284.6 kJ + 2 = 142.3 kJ/mol
What is the overall enthalpy of reaction for the equation shown below?
3H2(g) + 0,9) — 3H2O(g)
kJ

D.na is the answer hope this

Aphysical change is one that you can put in and remove like a ham sandwich. the stuff you put in there can be changem its not permanet. a chemical change is on that can't be change thats permanet. like when you make a cake and bake it. you can't get those ingredients back.

Firstly, the water in the dams hold gravitational potential energy as they are above ground level. the gravitational potential energy is then transferred to kinetic energy as it falls, spinning the turbinethe turbine then spins the generator, which is a large magnet surrounded by metal coils. by doing this, the generator generates electricity. in this action, the energy transfer taken place is kinetic to electric energy