What does a negative A Hf for a molecule mean? O A. Energy was added when the molecule was formed from its
elements.
O B. Energy was released when the molecule went through a phase
change.
C. Energy was released when the molecule was formed from its
elements.
O D. Energy was added when the molecule changed phases.

Temperature is _related to the average kinetic energy of a gas. inversely directly not disproportionally

Identify one disadvantage to each of the following models of electron configuration: -dot structures -arrow and line diagrams -written electron configurations type in your answer below. (answer) -dot structures do not show the distribution of electrons in orbitals and take up a lot of space. -arrow and line diagrams take up a lot of space and make it difficult to count electrons. -written configurations make it easy to lose count of electrons and do not show the distribution of electrons in orbitals.

How many mmols of tris-hcl are there in 100 ml of a 100 mm tris-hcl buffer solution at ph 8.1? note that the 100 mm refers to the sum of tris and tris-hcl concentrations?