The enthalpy of fusion, or heat of fusion (Hfusion), of water is positive and corresponds to which physical change?
A) H2O(g) H2O(s)
B) H2O(l) H2O(s)
C) H2O(s) H2O(l)
D) H2O(s) H2O(g)
Question 2
To produce carbon black, ________.
A) diamond is exposed to extremely high pressures and temperatures
B) wood is strongly heated in the absence of oxygen
C) coal is strongly heated in the absence of oxygen
D) hydrocarbons such as methane are heated in a very limited supply of oxygen
E) graphite is cooled to -273 C