1. (a) Write the balanced reaction for CaH₂ with water and the reaction for HCl with water. Include appropriate phases on all reactants and products. (b) Refer to your reactions and explain why ionic hydrides carry the label “explosive solid.”

2. Determine the standard molar enthalpy of combustion for H₂(g). Use this information to determine the amount of energy released per pound of hydrogen when it burns.

3. Draw a Lewis dot structure for BH₃. Consult any resource you like and draw the dot structure of B₂H₆, diborane, a BH₃ dimer. Does diborane follow the traditional octet rules? Explain.

4. Problems 10.8, 10.24, 10.26 from the text.