11. A. Which solid melted completely? ___________________________________________________________________
B. How do you describe its melting behavior? ____________________________________________________________________
12. A. Which solid was not melted completely? ____________________________________________________________________
B. How do you describe its melting behavior? ____________________________________________________________________ 13. Is solid A considered a pure substance? Why or why not? ____________________________________________________________________
14. Is solid B considered as a mixture? Why or why not? ____________________________________________________________________ 15. What is the difference between pure substances from mixtures based on their melting point? ______________________________________________________________________ ​

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