a)
Interpretation:Vapor pressure as applied to melting should be defined.
Concept introduction:Changes that involve no transformation of one substance into another are called physical changes. In these changes, size and shape of matter are changed but these are not accompanied by
b)
Interpretation:Melting point or melting point range should be defined.
Concept introduction:Changes that involve no transformation of one substance into another are called physical changes. In these changes, size and shape of matter are changed but these are not accompanied by chemical reactions. Melting of ice, boiling of water, dissolution of sugar into water are some examples of physical changes.
c)
Interpretation:Mixed melting point should be defined.
Concept introduction:Changes that involve no transformation of one substance into another are called physical changes. In these changes, size and shape of matter are changed but these are not accompanied by chemical reactions. Melting of ice, boiling of water, dissolution of sugar into water are some examples of physical changes.
d)
Interpretation:Eutectic point should be determined.
Concept introduction:Changes that involve no transformation of one substance into another are called physical changes. In these changes, size and shape of matter are changed but these are not accompanied by chemical reactions. Melting of ice, boiling of water, dissolution of sugar into water are some examples of physical changes.
e)
Interpretation: Eutectic mixture should be determined.
Concept introduction: Changes that involve no transformation of one substance into another are called physical changes. In these changes, size and shape of matter are changed but these are not accompanied by chemical reactions. Melting of ice, boiling of water, dissolution of sugar into water are some examples of physical changes.
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Chapter 3 Solutions
EBK EXPERIMENTAL ORGANIC CHEMISTRY: A M
- Filter paper is usually a poor material on which to powder a solid sample before introducing it into a capillary melting-point tube because small particles of paper may end up in the tube along with the sample. Why is this undesirable? and how might the presence of paper in the sample make the melting-point determination difficultarrow_forwardIn order to obtain accurate data it is important to add hear slowly and steadily when the temperature gets close to the melting point of a sample. Why is necessary?arrow_forwardDescribe the errors which may cause an observed melting point range of a PURE sample to be: higher than the correct melting point broad in rangearrow_forward
- 1. Why does the solid need to be finely ground and then tightly packed in a melting point capillary tube?arrow_forwardTrue or False. It is very important to regulate the temperature of the heating mantle so that the distillation occurs at a rate of about 1 drop per 2 seconds. Why?arrow_forwardIn this lab, you used rotary evaporation to remove the neutral organic solvent. Rotary evaporation is an example of a distillation except under conditions of a reduced pressure atmosphere. What effect does a reduction in atmospheric pressure have on the observed boiling point? Explain your answer.arrow_forward
- When performing arecrystallization, slocent with a boiling point less must be use than the melting point of the compound being recrystallized. For benzil ( m.p.94-95C) which solvent would be best for this recrystallization? toluene (b.p. 110C) H2O (b.p.100 C) ethane( bo -98) methanol(bp64.7)arrow_forwardWhat is done if the solid contains a colored impurity? Know the proper funnels and equipment to use. What is done if a solid impurity remains after your desired compound is dissolved in asolvent? When do you read the temperature to determine the boiling point of a liquid whendoing microscale boiling point determinationarrow_forwardWhy would a solvent with a very high boiling point be inappropriate for a recrystallization? Too much solvent would be lost to evaporation during the heating phase of the recrystallization Impurities and the compound to be recrystallized would dissolve equally well in this solvent A high boiling solvent would not dissolve the compound to be recrystallized It would be difficult to remove residual solvent from the purified crystalsarrow_forward
- illustrate and explain your answer Describe what happened to the undisturbed setups after leaving them in the sunlight.arrow_forwardDescribe the temperature-composition diagram. What did you observe with the temperature of the vapor and distillate in relation to the composition of the distillate?arrow_forwardBrian forgot to close the end of his capillary tube when he was conducting the boiling point determination experiment. He then decided to use a lighter to close the end, making sure that it does not touch the oil. Which of the following statements is true? a. Brian did a great job in making sure that the experiment worked. It is important to close the end of the capillary tube for accurate determination of the lower limit of the sample's boiling point. b. What Brian did is dangerous as oil is a flammable substance. He should have stopped the experiment then closed the tube first before continuing. c. It is not important to close the end of the tube. He could have just proceeded with the experiment or covered the end of the tube with tape since prolonged air contact might contaminate the sample. d. Brian could have covered the end of the capillary tube with his finger, since it is not as dangerous as using the lighter on a flammable substance such as oil.…arrow_forward
EBK A SMALL SCALE APPROACH TO ORGANIC LChemistryISBN:9781305446021Author:LampmanPublisher:CENGAGE LEARNING - CONSIGNMENT