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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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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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Heating and Cooling Curves concept. You can view video lessons to learn Heating and Cooling Curves. Or if you need more Heating and Cooling Curves practice, you can also practice Heating and Cooling Curves practice problems.

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Based on our data, we think this problem is relevant for Professor Meyer's class at CASE.