140 120 100 P. 80 60 40 20 - 20 20 40 100 120 Time (min) Answer the following questions for the heating curve of a substance, given above. a) Melting point of the substance is C. b) The letter represents the temperature range where the solid is being heated is C) In which part of the curve, substance is available in both solid and liquid state simultaneously? Temperature (°C)

A 41.30 g piece of solid acetone has a temperature of -119.2°C. How much heat is involved in converting it to a liquid with a temperature of -94.0°C? Formula: C3H6OMelting Point: -94.0°CBoiling Point: 56.0°CDensity of liquid: 0.791 g/mLHeat of Fusion: 98.14 J/gHeat of vaporization: 538.9 J/gSpecific heat capacity (solid): 1.653 J/g°CSpecific heat capacity (liquid): 2.161 J/g°CSpecific heat capacity (gas): 1.291 J/g°C

A pure solid sample of Substance X is put into an evacuated flask. The flask is heated at a steady rate and the temperature recorded as time passes. Here is a graph of the results: 12 230 temperature (°C) 210. 190. 170 150.- 130. 0. 10. What is the melting point of X ? Use this graph to answer the following questions: 30. heat added (kJ/mol) What phase (physical state) of X would you expect to find in the flask after. 17 kJ/mol of heat has been added? 40 50. 0°C (check all that apply) Osolic O liquid Ogas 60 olo Ar

Consider the following phase diagram. Phase diagram for compound A 1000 2 760 3 50 10 -25 25 100 150 Temperature, °C (not to scale) Which red dot represents the melting point of this compound at 760 torr? [ Select ] What is the approximate melting temperature for this substance at 760 torr? [ Select ] Which red dot represents the boiling point of this compound at 760 torr? [ Select ] What is the approximate boiling temperature for this substance at 760 torr? [ Select ] Which red dot represents the triple point for this substance? [ Select ] |What is the approximate temperature of the triple point? [ Select ] Pressure, torr (not to scale)

From point A to point B, choose one or more of the following, gas is heated solid is heated solid is cooled freezing vaporization melting deposition sublimation liquid is heated gas is cooled liquid is cooled condensation

Classify the following phase changes as processes that require the input of energy, or as processes that have a net output of energy. Drag the appropriate items to their respective bins. > View Available Hint(s) Reset Help vaporizing condensing deposition subliming melting freezing

= STATES OF MATTER Identifying phase transitions on a heating curve A pure solid sample of Substance X is put into an evacuated flask. The flask is heated at a steady rate and the temperature recorded as time passes. Here is a graph of the results: temperature (°C) 170. 150. 130. 110. 90 70. 0. 10. What is the melting point of X ? Use this graph to answer the following questions: heat added (kJ/mol) What phase (physical state) of X would you expect to find in the flask after 5 kJ/mol of heat has been added? *C 30. X 40. (check all that apply) solid liquid gas 0/3 50.

3. A substance has a heat of vaporization of 28.90 kJ/mol.  At -21 °C it has a vapor pressure of 137 mmHg.  What is the temperature in °C when the vapor pressure is 14 mmHg?  Round to the nearest whole number.

Use the observation in the first column to answer the question in the second column. observation question Which has the higher boiling point? O Substance E The enthalpy of vaporization of Substance E is smaller Substance F than that of Substance F. Neither, E and F have the same boiling point. It's impossible to know without more information. Which has a higher enthalpy of vaporization? At 36 °C, Substance C has a Substance C vapor pressure of 140. tor and Substance D has a vapor Substance D pressure of 130. torr. Neither, C and D have the same enthalpy of vaporization. It's impossible to know without more information. Which has a higher enthalpy of vaporization? At 1 atm pressure, Substance A Substance A boils at -12. °C and Substance B Substance B boils at 1. °C. Neither, A and B have the same enthalpy of vaporization. It's impossible to know without more information.