As shown in the figure, a reaction vessel initially contains hydrogen and oxygen.  Which figure best shows the reaction once complete?                2H2(g) + O2(g)2H2O(g)                        Data sheet and Periodic Table

Using formal charges, which Lewis dot structure is correct for the carbonate ion, CO32–?   Data sheet and Periodic Table

How many sigma (σ) and pi (π) bonds are in the molecule shown?          Data sheet and Periodic Table

Which relationship could be shown in the graph?          Data sheet and Periodic Table

Which atom(s) in the acetic acid (CH3COOH, shown) is/are sp3 hybridized as identified with the bolded/larger atom(s)?             Data sheet and Periodic Table

Between HI and HF, which has the higher boiling point and why?  Data sheet and Periodic Table

What mass of sodium hydroxide (NaOH, molar mass = 40.0 g∙mol–1) is needed to make 100.0 mL of a 0.125 M NaOH solution?   Data sheet and Periodic Table

The standard molar enthalpy of combustion of ethane (C2H6(g)) is –1559.7 kJ∙mol–1.  Which energy diagram corresponds to this process?  Data sheet and Periodic Table

Which combination will result is a precipitate forming?  Data sheet and Periodic Table

Which acid is named correctly?  Data sheet and Periodic Table