Given the reaction: 2 H2 (g) + O2 (g) – 2 H2O(l) + 571.6 kJ What is the approximate AH for the formation of 1 mole of H2O(l)?
1.
-285.8 kJ
2.
+285.8 kJ
3.
-571.6 kJ
4
+571.6 kJ

the volume increases

a polar bond is formed when electrons are shared unevenly between atoms

c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.