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- 1. Multiple Choice
Water exists as a _____________ at 700 mmHg and 50 °C.solidliquidgassupercritical fluid - 2. Multiple ChoiceWhat phase change(s) may occur at pressures below 4.58 mmHg?sublimation/depositionmelting/freezingall phase changes are possible at these pressuresvaporization/condensation
- 3. Multiple ChoiceThe pressure is increased on a sample of water at 0 °C from 0 mmHg to 800 mmHg. In order, what changes occur?deposition, meltingsublimation, meltingcondensation, freezingdeposition, freezing
- 4. Multiple ChoiceWhat is true regarding CO2 for temperatures above 31 °C?It can never be liquified.It decomposes.It has a high pressure.It is a plasma.
- 5. Multiple ChoiceAt 10 atm, dry ice is heated from -100 °C to 30 °C. What changes occur?freezing, then condensationmelting onlysublimation onlymelting, then boiling
- 6. Multiple ChoiceWhat is the normal melting point of CO2?-78.5 °C-56.7 °C31 °CIt doesn't have a normal melting point.
- 7. Multiple ChoiceWhat is the normal boiling point of CO2?-78.5 °C-56.7 °C31 °CIt doesn't have a normal boiling point.
- 8. Multiple ChoiceWhat state of matter is X?solidliquidgassupercritical fluid
- 9. Multiple ChoiceWhat state of matter is Y?solidliquidgassupercritical fluid
- 10. Multiple ChoiceWhat state of matter is Z?solidliquidgassupercritical fluid
- 11. Multiple ChoiceWhat change occurs from F to E?sublimationdepositionmeltingcondensation
- 12. Multiple ChoiceWhat change occurs from E to C?sublimationfreezingmeltingboiling
- 13. Multiple ChoiceWhat change occurs from C to D?condensationvaporizationmeltingsublimation
- 14. Multiple ChoiceWhat is the normal boiling point of this substance?150 °C100 °C-50 °C0 °C
- 15. Multiple ChoiceWhat is the normal melting point of this substance?150 °C100 °C-50 °C0 °C
- 16. Multiple ChoiceWhat is point A?triple pointcritical pointequilibrium pointnormal melting point
- 17. Multiple ChoiceAt 0.10 atm, what phase(s) can exist?solid, liquid or gasliquid or gassolid onlygas only
- 18. Multiple ChoiceWater exists as a _____________ at 3 mmHg and 50 °C.solidliquidgassupercritical fluid
- 19. Multiple ChoiceWhich statement is true for carbon dioxide at -60 °C?All three phases are possible.It can exist as a solid or a gas, depending on pressure.It is a solid.With enough pressure it can be melted.
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