Chemistry Practice Problems Heating and Cooling Curves Practice Problems Solution: A pure solid sample of Substance X is put into an ...

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Solution: 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: 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? (check all that apply)            • solid            • liquid             • gas

Problem

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: 

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? (check all that apply)

            • solid

            • liquid 

            • gas

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