On the phase diagram, point A denotes the _________ and with a decrease in pressure at a constant temperature, the substance will be a _________.          Data sheet and Periodic Table

It takes 38.65 mL of a 0.0895 M hydrochloric acid solution to reach the equivalence point in the reaction with 25.00 mL of barium hydroxide.                                                2HCl(aq) + Ba(OH)2(aq)2H2O(l) + BaCl2(aq)What is the molar concentration of the barium hydroxide solution?   Data sheet and Periodic Table

What is the standard enthalpy change for the reaction?  2NH3(g)N2H4(l) + H2(g)N2H4(l) + O2(g)N2(g) + 2H2O(g)               ΔH°1 = –543 kJ·mol–12H2(g) + O2(g)2H2O(g)                              ΔH°2 = –484 kJ·mol–1N2(g) + 3H2(g)2NH3(g)                               ΔH°3= –92 kJ·mol–1   Data sheet and Periodic Table

Which molecule is polar?   Data sheet and Periodic Table

What particles would be present in NH3(aq)?  Data sheet and Periodic Table

In the compound (NH4)2S2O3, which element is present in the largest percent by mass?  Data sheet and Periodic Table

What is the standard enthalpy change for the reaction?  2NH3(g)N2H4(l) + H2(g)N2H4(l) + O2(g)N2(g) + 2H2O(g)               ΔH°1 = –543 kJ·mol–12H2(g) + O2(g)2H2O(g)                              ΔH°2 = –484 kJ·mol–1N2(g) + 3H2(g)2NH3(g)                               ΔH°3= –92 kJ·mol–1   Data sheet and Periodic Table

The molar enthalpy of formation for H2O(l) is –285.8 kJ·mol–1.  Which expression describes the enthalpy change for the reaction:2H2O(l)2H2(g) + O2(g)                ΔH° = ?  Data sheet and Periodic Table

In a 10.0 L vessel at 100.0 oC, 10.0 grams of an unknown gas exert a pressure of 1.13 atm.   What is the gas? Data sheet and Periodic Table

Which calculation can be used to determine the standard enthalpy of formation of NO(g)?N2(g) + 2O2(g)2NO2(g)              ΔH°1NO(g) + ½O2(g)NO2(g)              ΔH°2   Data sheet and Periodic Table