Can All Solids Be Liquefied by Increasing Pressure?

[Intr3pid]

Homework Statement

Which of the following solid substances can be liquefied simply by increasing the pressure suffciently?
ice (H2O)
diamond (C)
dry ice (CO2)
sulfur (S)
graphite (C)

Which of the following substances cannot be liquified at 1 atm pressure?
nitrogen (N2)
helium (He)
hydrogen (H2)
water (H2O)
carbon dioxide (CO2)

Homework Equations

The Attempt at a Solution

I know that some of them are solids, liquids and gases in standard state but I don't know which can be liquified etc. help?

 

[Borek]

In general, you will need phase diagrams for these. And without temperature given first question can't be answered. See water phase diagram:

http://www.lsbu.ac.uk/water/phase.html