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: 120. 100. - 80. temperature (°C) 60. - 40. 20. 10. 50 heat added (kJ/mol) Use this graph to answer the following questions: What is the melting point of X ? (check all that apply) O solid What phase (physical state) of X would you expect to find in the flask after 2 kJ/mol of heat has been added? O liquid O gas

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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:
120.
100.
80.
temperature (°C)
60.
40.
20.
0.
10.
20.
30.
40.
50.
heat added (kJ/mol)
Use this graph to answer the following questions:
What is the melting point of X ?
(check all that apply)
What phase (physical state) of X would
you expect to find in the flask after
2 kJ/mol of heat has been added?
solid
O liquid
gas
?
Transcribed Image Text: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: 120. 100. 80. temperature (°C) 60. 40. 20. 0. 10. 20. 30. 40. 50. heat added (kJ/mol) Use this graph to answer the following questions: What is the melting point of X ? (check all that apply) What phase (physical state) of X would you expect to find in the flask after 2 kJ/mol of heat has been added? solid O liquid gas ?
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