The proof that the test tubes contain three different chemical compounds should be given. Also, the minimumnumber of melting points needed to proof that should be determined. Concept introduction: Temperature at which an element changes from the solid state to the liquid state is known as melting point or sometimes liquefaction point. At the melting point, both solid and liquid phase coexist in equilibrium. It depends on the pressure and is normally defined at the standard pressure ( 1 atm ) . Mixed melting point is a techniquethat is used to identify chemical compounds. It is used when a substance of known identity and melting point is mixed with another unknown substance to calculate its melting point.

Question

3. A student is trying to identify an unknown solid based on its melting point. She noted that the compound began to melt at 172°C and finished melting at 177°C. Knowing it is possible for there to be impurities in the sample, is this compound more likely to be camphor or hydroquinone. Explain your reasoning. 4. A young chemist has synthesized what he believed to be acetaminophen. He measured the melting point of this newly formed compound to be 163-178°C. If the literature value for the melting point of acetaminophen = 169-170.5°C, would the young chemist be wise to consume this product for headache relief? Why or why not?

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Chapter 3, Problem 3Q

Interpretation Introduction

Interpretation:

The proof that the test tubes contain three different chemical compounds should be given. Also, the minimumnumber of melting points needed to proof that should be determined.

Concept introduction:

Temperature at which an element changes from the solid state to the liquid state is known as melting point or sometimes liquefaction point. At the melting point, both solid and liquid phase coexist in equilibrium. It depends on the pressure and is normally defined at the standard pressure (1 atm).

Mixed melting point is a techniquethat is used to identify chemical compounds. It is used when a substance of known identity and melting point is mixed with another unknown substance to calculate its melting point.

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