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) 30 38 heat added (kJ/mol) Use this graph to answer the following questions: What is the melting point of X? What phase (physical state) of X would you expect to find in the flask after 9 kJ/mol of heat has been added? C (check all that apply) solid liquid gas X S 0 A

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Chapter1: Chemical Foundations
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A pure solid sample of Substance 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)
39
18
20
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
9 kJ/mol of heat has been added?
20
X
30
0°C
(check all that apply)
solid
O liquid
gas
000
Ar
Transcribed Image Text:A pure solid sample of Substance 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) 39 18 20 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 9 kJ/mol of heat has been added? 20 X 30 0°C (check all that apply) solid O liquid gas 000 Ar
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