
Interpretation: The reason of expressing heat of combustion in negative value needs to be described.
Concept introduction: Combustion reactions are used to power vehicles, heat water and homes, and create electricity. But not all combustion reactions provide the same amount of energy.

Answer to Problem 3E
Heat of combustion indicated as a negative number because energy is transferred from the system.
Explanation of Solution
Heat of reaction for a combustion reaction is usually referred to as the heat of combustion. When the reaction is exothermic heat of reaction is indicated as negative number. This is because energy is transferred from the system.
Heat of reaction cab indicated in kilocalories per mole, kilocalories per gram, kilojoules per mole and kilojoules per gram.
Chapter U5 Solutions
Living By Chemistry: First Edition Textbook
Additional Science Textbook Solutions
Microbiology with Diseases by Body System (5th Edition)
Concepts of Genetics (12th Edition)
Genetic Analysis: An Integrated Approach (3rd Edition)
Biology: Life on Earth (11th Edition)
Chemistry: An Introduction to General, Organic, and Biological Chemistry (13th Edition)
- Q7: Rank the following groups in order of basicity, nucleophilicity, and leaving group ability. a) H₂O, OH, CH3COOT b) NH3, H₂O, H₂Sarrow_forwardQ8: Rank the following compounds in order of increasing reactivity in a nucleophilic substitution reaction with CN as the nucleophile. Br A B NH2 LL F C D OH CI LLI E Q9: Complete the missing entities for following reactions (e.g., major product(s), reactants, and/or solvents) for the SN2 reactions to occur efficiently. Include curved-arrow mechanism for reactions a) to d). a) H "Cl D + -OCH 3 Page 3 of 5arrow_forwardQ10: (a) Propose a synthesis of C from A. (b) Propose a synthesis of C from B. Br Br ...\SCH 3 A B Carrow_forward
- 9: Complete the missing entities for following reactions (e.g., major product(s), reactants, and/or solvents) for the SN2 reactions to occur efficiently. Include curved-arrow mechanism for reactions a) to d).arrow_forwardComplete the missing entities for following reactions (e.g., major product(s), reactants, and/or solvents) for the SN2 reactions to occur efficiently. Include curved-arrow mechanism for reactions a) to d).arrow_forwardQUESTION 3: Provide the synthetic steps that convert the starting material into the product (no mechanism required). HO OH NH CH3 multiple steps 요요 H3Carrow_forward
- Q6: Predict the effect of the changes given on the rate of the reaction below. CH3OH CH3Cl + NaOCH3 → CH3OCH3 + NaCl a) Change the substrate from CH3CI to CH31: b) Change the nucleophile from NaOCH 3 to NaSCH3: c) Change the substrate from CH3CI to (CH3)2CHCI: d) Change the solvent from CH3OH to DMSO.arrow_forwardQ3: Arrange each group of compounds from fastest SN2 reaction rate to slowest SN2 reaction rate. a) CI Cl فيكم H3C-Cl A B C D Br Br b) A B C Br H3C-Br Darrow_forwardQ2: Group these solvents into either protic solvents or aprotic solvents. Acetonitrile (CH3CN), H₂O, Acetic acid (CH3COOH), Acetone (CH3COCH3), CH3CH2OH, DMSO (CH3SOCH3), DMF (HCON(CH3)2), CH3OHarrow_forward
- Suppose the rate of evaporation in a hot, dry region is 1.76 meters per year, and the seawater there has a salinity of 35 ‰. Assuming a 93% yield, how much salt (NaCl) can be harvested each year from 1 km2 of solar evaporation ponds that use this seawater as a source?arrow_forwardhelparrow_forwardExplain why only the lone pairs on the central atom are taken into consideration when predicting molecular shapearrow_forward
- ChemistryChemistryISBN:9781305957404Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCostePublisher:Cengage LearningChemistryChemistryISBN:9781259911156Author:Raymond Chang Dr., Jason Overby ProfessorPublisher:McGraw-Hill EducationPrinciples of Instrumental AnalysisChemistryISBN:9781305577213Author:Douglas A. Skoog, F. James Holler, Stanley R. CrouchPublisher:Cengage Learning
- Organic ChemistryChemistryISBN:9780078021558Author:Janice Gorzynski Smith Dr.Publisher:McGraw-Hill EducationChemistry: Principles and ReactionsChemistryISBN:9781305079373Author:William L. Masterton, Cecile N. HurleyPublisher:Cengage LearningElementary Principles of Chemical Processes, Bind...ChemistryISBN:9781118431221Author:Richard M. Felder, Ronald W. Rousseau, Lisa G. BullardPublisher:WILEY





