Which substance shows the strongest hydrogen bonding?  

The enthalpy of fusion is the energy required to: 

The temperature at which vapor pressure equals atmospheric pressure is the:  

Sublimation is the direct change from:  

At STP, the volume of 1 mole of any ideal gas is approximately:  

Charles’s Law states that at constant pressure, volume is directly proportional to:  

Viscosity is:  

Which unit of pressure is the SI unit?  

atmospheric pressure decreased with 

For the reaction N₂ + 3H₂ → 2NH₃, 1 volume of N₂ reacts with ______ volumes of H₂.