
Concept explainers
(a)
Interpretation:
The following term has to be defined –
Evaporation
Concept introduction:
Evaporation is the phenomenon involving phase change. It is the transition of liquid to vapor state. This process is applicable to liquids. Evaporation can either occur spontaneously at room temperature or by inducing changes in energy of the molecules. The liquids that evaporate spontaneously at room temperature are called volatile liquids. The liquids that do not evaporate readily and require external energy to undergo evaporation are called non-volatile liquids. It is an endothermic phenomenon.
(b)
Interpretation:
The following term has to be defined –
Condensation
Concept introduction:
Condensation is a process involving phase change. The molecules in vapor phase transit to liquid phase in this process releasing heat to surroundings.
(c)
Interpretation:
The following term has to be defined –
Sublimation
Concept introduction:
Sublimation is a process of conversion of solid molecules directly to vapor molecules. That is, direct vaporization of solid without the involvement of any intermediate phase. It is an endothermic process.
(d)
Interpretation:
The following term has to be defined –
Boiling
Concept introduction:
Boiling is the applicable to liquids and an endothermic process. It is a process used to vaporize a liquid. It is familiar that evaporation is accompanied by heating the liquid to boil.
(e)
Interpretation:
The following term has to be defined –
Melting
Concept introduction:
Melting is the process applicable to solids and it is an endothermic process. Solid converts to liquid during melting.
(f)
Interpretation:
The following term has to be defined –
Enthalpy of vaporization
Concept introduction:
The term enthalpy means heat content. Vaporization means conversion to vapor. Thus enthalpy of vaporization is the heat required by a liquid substance to convert itself completely to vapor.
(g)
Interpretation:
The following term has to be defined –
Enthalpy of fusion
Concept introduction:
Enthalpy of fusion is the heat required by a solid substance to convert to liquid phase.
(h)
Interpretation:
The following term had to be defined –
Heating curve
Concept introduction:
Heating curve is a graphical representation used to observe the heating process over a period of time.

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Chapter 9 Solutions
EBK CHEMISTRY: AN ATOMS FIRST APPROACH
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- Briefly answer three from the followings: a. What are the four structures of the protein? b. Why is the side chain (R) attached to the alpha carbon in the amino acids is important for the function? c. What are the types of amino acids? And how is it depend on the (R) structure? d. Write a reaction to prepare an amino acid. prodarrow_forwardAnswe Answer A and B pleasearrow_forward3. Refer to the data below to answer the following questions: Isoelectric point Amino Acid Arginine 10.76 Glutamic Acid 3.22 Tryptophan 5.89 A. Define isoelectric point. B. The most basic amino acid is C. The most acidic amino acid is sidizo zoarrow_forward
- 3. A gas mixture contains 50 mol% H2 and 50 mol% He. 1.00-L samples of this gas mixture are mixed with variable volumes of O2 (at 0 °C and 1 atm). A spark is introduced to allow the mixture to undergo complete combustion. The final volume is measured at 0 °C and 1 atm. Which graph best depicts the final volume as a function of the volume of added O2? (A) 2.00 1.75 Final Volume, L 1.50 1.25 1.00 0.75 0.50 0.25 0.00 0.00 0.25 0.50 2.00 (B) 1.75 1.50 Final Volume, L 1.25 1.00 0.75 0.50- 0.25 0.00 0.75 1.00 0.00 0.25 Volume O₂ added, L 2 0.50 0.75 1.00 Volume O₂ added, L 2 2.00 2.00 (C) (D) 1.75 1.75 1.50 1.50 Final Volume, L 1.25 1.00 0.75 0.50 Final Volume, L 1.25 1.00 0.75 0.50 0.25 0.25 0.00 0.00 0.00 0.25 0.50 0.75 1.00 0.00 0.25 Volume O₂ added, L 0.50 0.75 1.00 Volume O₂ added, L 2arrow_forwardLeucine is an essential amino acid with the systematic name 2-amino-3-methylpentanoic acid. It has pai 2.36 and pKa2 = 9.60. H2N-C(R)H-COOH and R is -CH2-CH(CH3)2 A. Draw the condensed structure for leucine, and label all chirality centers with an asterisk. B. How many possible stereoisomers of leucine are there? C. Draw a Fischer projection of L-leucine and label the chirality center(s) as R or S. D. What is the p/ of leucine? E. Draw the structure of the predominant form of leucine at 10.00. F. Draw the structure of the predominant form of leucine at pH = 1.50. G. Leucine is described as an essential amino acid. What does this mean? H. Show the alkyl halide you would use to prepare leucine by the amidomalonate method. =arrow_forwarda) Write out 6 completely different reactions of acetophenone (reagent, product). b) Write out 3 preparations of 1-methylcyclohexanol, using a different starting material for each one. You may use preps where you just change the functional group, and/or preps where you construct the carbon chain. c) Write out 3 preparations of 2-ethoxybenzoic acid, a different starting material for each one. You may use preps where you just change the functional group, and/or preps where you construct the carbon chain.arrow_forward
- 12. CH3 OH OH H&C CH3 H₂C N OH H₂C CH3 H&C CH3 H₂C' CH3 H.C CH3OH H.C CH2CH3OH CH3CEN Which one of these 17 compounds is represented by this IR and this 'H NMR spectrum? IR Spectrum 3000 4000 3000 NMR Spectrum 2000 £500 RAVENUMBER 2000 1500 9 8 6 5 10 HP-00-290 ppm m 1000 500 1000 4 °arrow_forwardDraw the structure of (E,6R) 6-methoxy-4-hepten-2-one. Give the IUPAC name of this compound, including stereochemistry. Draw the most stable chair conformation of (cis) 1,3-isobutylcyclohexane. H HC=CCH₂ CH2CH3 EN(CH3)2 -CN(CH3)2arrow_forward10. Write out the mechanism (intermediate/transition state) for this reaction; indicate stereochemistry in product. H3C CH₂OH CH3 SN1 Harrow_forward
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