8. calculate the enthalpy change, ah, for the reaction:
h2o(s) → h2(g) + % o2(g)
use the following elementary reactions:
h2(g) + % o2(g) → h2o(l) ah = -285.9 kj
h2o(s) → h2o(1)
ah = 6.0kj

The nuclear fission process releases neutrons and question 27 options: alpha particles electrons energy beta particles

What is the ph of a 0.0010 m hno3? 1.0 3.0 4.0 5.0

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.