Chemistry
9th Edition
ISBN: 9781133611097
Author: Steven S. Zumdahl
Publisher: Cengage Learning
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Textbook Question
Chapter 8, Problem 23Q
Combustion reactions of fossil fuels provide most of the energy needs of the world. Why do the combustion reactions of fossil fuels produce so much energy?
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10. You're preparing for a camping trip. you see two different stoves you can pack for your trip to do
all your cooking. Which fuel would you prefer to carry?
One stove uses fuel propane.
The other stove uses naphtha (hexane) fuel.
Start by writing a balanced combustion equation for both of these reactions. Use either standard
enthalpies of formation or bond energies to determine the enthalpy changes for the combustion of
these two fuels. Then suggest which stove, the one that uses propane or the one that uses naphtha,
would you recommend to pack for your camping trip? Explain. (You may need more space for
your response).
2. A 35 g metal ball made up of a mixture of element X and element Y is heated up to 77C and
dropped into 20 mL of 15°C water. If the final temperature of the metal ball is 30°C, what percentage
of the ball is made up of element X? The specific heat of element X is 0.46 J/g°C and the specific heat
of element Y is (0.209 J/g°C).
Use the References to access important values if needed for this question.
Use average bond enthalpies (linked above) to calculate the enthalpy change for the following gas-phase reaction.
2HBr(g) + Cl₂(g) → 2HCI(g) + Br₂(0)
To analyze the reaction, first draw Lewis structures for all reactant and product molecules.
Draw the reaction using separate sketchers for each species.
• Separate multiple reactants and/or products using the + sign from the drop-down arrow.
. Separate reactants from products using the symbol from the drop-down menu.
Remember to include nonbonding valence electrons in your Lewis structures.
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Chapter 8 Solutions
Chemistry
Ch. 8 - Distinguish between the terms electronegativity...Ch. 8 - When an element forms an anion, what happens to...Ch. 8 - Define the term lattice energy. Why,...Ch. 8 - Explain how bond energies can be used to estimate...Ch. 8 - Prob. 5RQCh. 8 - Explain the terms resonance and delocalized...Ch. 8 - Define formal charge and explain how to calculate...Ch. 8 - Give two requirements that should be satisfied for...Ch. 8 - Consider the following compounds: CO2, SO2, KrF2,...Ch. 8 - Explain the electronegativity trends across a row...
Ch. 8 - The ionic compound AB is formed. The charges on...Ch. 8 - Prob. 3ALQCh. 8 - The bond energy for a CH bond is about 413 kJ/mol...Ch. 8 - Prob. 5ALQCh. 8 - Which has the greater bond lengths: NO2 or NO3?...Ch. 8 - The following ions are best described with...Ch. 8 - The second electron affinity values for both...Ch. 8 - What is meant by a chemical bond? Why do atoms...Ch. 8 - Why are some bonds ionic and some covalent?Ch. 8 - How does a bond between Na and Cl differ from a...Ch. 8 - Arrange the following molecules from most to least...Ch. 8 - Does a Lewis structure tell which electron come...Ch. 8 - Describe the type of bonding that exists in die...Ch. 8 - Some plant fertilizer compounds are (NH4)2SO4,...Ch. 8 - Some of the important properties of ionic...Ch. 8 - What is the electronegativity trend? Where does...Ch. 8 - Give one example of a compound having a linear...Ch. 8 - When comparing the size of different ions, the...Ch. 8 - In general the higher the charge on the ions in an...Ch. 8 - Combustion reactions of fossil fuels provide most...Ch. 8 - Which of the following statements is/are true?...Ch. 8 - Three resonance structures can be drawn for CO2....Ch. 8 - Which of the following statements is(are) true?...Ch. 8 - Without using Fig. 3-4, predict the order of...Ch. 8 - Without using Fig. 3-4, predict the order of...Ch. 8 - Without using Fig. 3-4, predict which bond in each...Ch. 8 - Without using Fig. 3-4, predict which bond in each...Ch. 8 - Prob. 31ECh. 8 - Prob. 32ECh. 8 - Which of the following incorrectly shows the bond...Ch. 8 - Indicate the bond polarity (show the partial...Ch. 8 - Predict the type of bond (ionic, covalent, or...Ch. 8 - List all the possible bonds that can occur between...Ch. 8 - Hydrogen has an electronegativity value between...Ch. 8 - Rank the following bonds in order of increasing...Ch. 8 - State whether or not each of the following has a...Ch. 8 - The following electrostatic potential diagrams...Ch. 8 - Prob. 41ECh. 8 - Prob. 42ECh. 8 - Predict the empirical formulas of the ionic...Ch. 8 - Predict the empirical formulas of the ionic...Ch. 8 - Write electron configurations for a. the cations...Ch. 8 - Write electron configurations for a. the cations...Ch. 8 - Which of the following ions have noble gas...Ch. 8 - What noble gas has the same electron configuration...Ch. 8 - Give the formula of a negative ion that would have...Ch. 8 - Prob. 50ECh. 8 - Give three ions that are isoelectronic with neon....Ch. 8 - Consider the ions Sc3+, Cl, K+, Ca2+, and S2....Ch. 8 - Prob. 53ECh. 8 - For each of the following groups, place the atoms...Ch. 8 - Which compound in each of the following pairs of...Ch. 8 - Which compound in each of the following pairs of...Ch. 8 - Use the following data for potassium chloride to...Ch. 8 - Use the following data for magnesium fluoride to...Ch. 8 - Consider the following energy changes: E(kJ/mol)...Ch. 8 - Compare the electron affinity of fluorine to the...Ch. 8 - Prob. 61ECh. 8 - Use the following data (in kJ/mol) to estimate E...Ch. 8 - Rationalize the following lattice energy values:...Ch. 8 - The lattice energies of FeCl3, FeCl2, and Fe2O3...Ch. 8 - Use bond energy values (Table 3-3) to estimate E...Ch. 8 - Use bond energy values (Table 3-3) to estimate E...Ch. 8 - Prob. 67ECh. 8 - Acetic acid is responsible for the sour taste of...Ch. 8 - Use bond energies to predict E for the following...Ch. 8 - The major industrial source of hydrogen gas is by...Ch. 8 - Use bond energies to estimate E for the combustion...Ch. 8 - Prob. 72ECh. 8 - Prob. 73ECh. 8 - Consider the following reaction: A2+B22AB E =...Ch. 8 - Compare your answers from parts a and b of...Ch. 8 - Compare your answers from Exercise 72 to the H...Ch. 8 - The standard enthalpies of formation for S(g),...Ch. 8 - Use the following standard enthalpies of formation...Ch. 8 - The standard enthalpy of formation for N2H2(g) is...Ch. 8 - The standard enthalpy of formation for NO(g) is...Ch. 8 - Write Lewis structures that obey the octet rule...Ch. 8 - Write Lewis structures that obey the octet rule...Ch. 8 - Write Lewis structures that obey the octet rule...Ch. 8 - Write Lewis structures that obey the octet rule...Ch. 8 - One type of exception to the octet rule are...Ch. 8 - Lewis structures can be used to understand why...Ch. 8 - The most common exceptions to the octet rule are...Ch. 8 - Prob. 88ECh. 8 - Write Lewis structures for the following. Show all...Ch. 8 - Prob. 90ECh. 8 - Benzene (C6H6) consists of a six-membered ring of...Ch. 8 - Borazine (B3N3H6) has often been called inorganic...Ch. 8 - An important observation supporting the concept of...Ch. 8 - Consider the following bond lengths: CO143pmC9O123...Ch. 8 - A toxic cloud covered Bhopal, India, in December...Ch. 8 - Peroxyacetyl nitrate, or PAN, is present in...Ch. 8 - Prob. 99ECh. 8 - Use formal charge arguments to explain why CO has...Ch. 8 - Write Lewis structures that obey the octet rule...Ch. 8 - Write Lewis structures for the species in Exercise...Ch. 8 - Oxidation of the cyanide ion produces the stable...Ch. 8 - When molten sulfur reacts with chlorine gas, a...Ch. 8 - Prob. 106ECh. 8 - Prob. 108ECh. 8 - Predict the molecular structure and bond angles...Ch. 8 - Predict die molecular structure and bond angles...Ch. 8 - There are several molecular structures based on...Ch. 8 - Two variations of the octahedral geometry (see...Ch. 8 - Predict the molecular structure (including bond...Ch. 8 - Predict the molecular structure (including bond...Ch. 8 - Predict the molecular structure (including bond...Ch. 8 - Predict the molecular structure (including bond...Ch. 8 - Prob. 117ECh. 8 - Which of the molecules in Exercise 120 have net...Ch. 8 - Which of the molecules in Exercise 121 have net...Ch. 8 - Which of the molecules in Exercise 122 have net...Ch. 8 - Write Lewis structures and predict the molecular...Ch. 8 - Write Lewis structures and predict whether each of...Ch. 8 - Consider the following Lewis structure where E is...Ch. 8 - Consider the following Lewis structure where E is...Ch. 8 - Prob. 125ECh. 8 - Two different compounds have the formula XeF2Cl2....Ch. 8 - Arrange the following in order of increasing...Ch. 8 - For each of the following, write an equation that...Ch. 8 - Use bond energies (table 3-3), values of electron...Ch. 8 - Write Lewis structures for CO32, HCO3, and H2CO3....Ch. 8 - Which member of the following pairs would you...Ch. 8 - What do each of the following sets of...Ch. 8 - Prob. 133AECh. 8 - Although both Br3 and I3 ions are known, the F3...Ch. 8 - Which of the following molecules have not dipole...Ch. 8 - Prob. 137AECh. 8 - Look up the energies for the bonds in CO and N2....Ch. 8 - Classify the bonding in each of the following...Ch. 8 - List the bonds PCl, PF, OF, and SiF from least...Ch. 8 - Arrange the atoms and/or ions in the following...Ch. 8 - Use the following data to estimate E for the...Ch. 8 - Use bond energy values to estimate E for the...Ch. 8 - Which of the following compounds or ions exhibit...Ch. 8 - The formulas of several chemical substances are...Ch. 8 - Predict the molecular structure, bond angles, and...Ch. 8 - Use Coulombs Jaw, V=Q1Q240r=2.311019Jnm(Q1Q2r) to...Ch. 8 - Prob. 148CPCh. 8 - Calculate the standard heat of formation of the...Ch. 8 - Given the following information: Energy of...Ch. 8 - Prob. 151CPCh. 8 - Think of forming an ionic compound as three steps...Ch. 8 - The compound NF3 is quite stable, but NCl3, is...Ch. 8 - Three processes that have been used for the...Ch. 8 - The compound hexaazaisowurtzitane is one of the...Ch. 8 - Many times extra stability is characteristic of a...Ch. 8 - The study of carbon-containing compounds and their...Ch. 8 - Draw a Lewis structure for the N,...Ch. 8 - Prob. 159CPCh. 8 - Consider the following computer-generated model of...Ch. 8 - A compound, XF5, is 42.81% fluorine by mass....Ch. 8 - Identify the following elements based on their...
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- hat does temperature measure? Are the molecules in a beaker of warm water moving at the same speed as the molecules in a beaker of cold water? Explain? What is heat? Is heat the same as temperature?arrow_forwardA commercial process for preparing ethanol (ethyl alcohol), C2H5OH, consists of passing ethylene gas. C2H4, and steam over an acid catalyst (to speed up the reaction). The gas-phase reaction is Use bond enthalpies (Table 9.5) to estimate the enthalpy change for this reaction when 37.0 g of ethyl alcohol is produced.arrow_forwardUse the References to access important values if needed for this question. Use average bond enthalpies (linked above) to calculate the enthalpy change for the following gas-phase reaction. Br₂(g) + Cl₂(g) →→→→→→2BrCl(g) To analyze the reaction, first draw Lewis structures for all reactant and product molecules. • Draw the reaction using separate sketchers for each species. • Separate multiple reactants and/or products using the + sign from the drop-down arrow. • Separate reactants from products using the symbol from the drop-down menu. . Remember to include nonbonding valence electrons in your Lewis structures. AHreaction CO Submit Answer kj Referen ChemDoodle [ ] کر remove te Enthalpy of Reaction Using Bond Energies - Draw Lewis: This is group attempt 1 of 10 Autosaved at 9:15 PMarrow_forward
- When a firecracker explodes, energy is obviously released. The compounds in the firecracker can be viewed as being “energy rich.” What does this mean? Explain the source of the energy in terms of chemical bonds.arrow_forwardA scientist studies the bond energies of different compounds containing nitrogen (N). The scientist observes that the N–N bonds in one group of compounds have a bond energy of 209 kJ/mol, while the N–N bonds in another group of compounds have a bond energy of 418 kJ/mol. In one or two sentences, postulate a reason for this difference.arrow_forwardUse the References to access important values if needed for this question. Use average bond enthalpies (linked above) to calculate the enthalpy change for the following gas-phase reaction. CH3OH(g) + HI(g) - CH31(g) + H₂O(g) To analyze the reaction, first draw Lewis structures for all reactant and product molecules. • Draw the reaction using separate sketchers for each species. ● Separate multiple reactants and/or products using the + sign from the drop-down arrow. ● Separate reactants from products using the → symbol from the drop-down menu. • Remember to include nonbonding valence electrons in your Lewis structures. ▾ ? ChemDoodle ▼ Sn [F removearrow_forward
- Estimate the enthalpy change (AH) of the following reaction using the average bond energies in the table below. *Hint: Draw out the structures to see how the atoms bond!* Reaction: 2C2H6 + 702 → 4CO2 + 6H2O Bond Energies: 436 kJ/mol 431 kJ/mol 413 kJ/mol C=C C=C C=0 614 kJ/mol 839 kJ/mol 799 kJ/mol 495 kJ/mol 1072 kJ/mol 615 kJ/mol H-H С-Н H-CI C-C 348 kJ/mol 293 kJ/mol 358 kJ/mol HF 567 kJ/mol C-N N-H 391 kJ/mol C-O O=0 N-O 201 kJ/mol C-F C-CI 485 kJ/mol C=0 463 kJ/mol 328 kJ/mol C=N 146 kJ/mol C-S 259 k/mol N=N 418 kJ/mol F-F 155 kJ/mol CI-CI 242 kJ/mol N=N 941 kJ/mol 891 kJ/mol C=N - 9117 kJ - 2831 kJ 11968 kJ 2518 kJ 312 kJarrow_forward2. A 35 g metal ball made up of a mixture of element X and element Y is heated up to 77°C and dropped into 20 mL of 15°C water. If the final temperature of the metal ball is 30°C, what percentage of the ball is made up of element X? The specific heat of element X is 0.46 J/g°C and the specific heat of element Y is (0.209 J/g"C). 213arrow_forward14.arrow_forward
- What is the most reactive, second most reactive, second least reactive, and least reactive out of the following metals: Magnesium, Copper, Nickel, and Silver?arrow_forwardEthanol can be used as a fuel source in an alcohol lamp. The formula for ethanol is C2H5OH. Write the balanced equation for the combustion of ethanol.arrow_forwardA particular chemical reaction has AH° = +250 kJ/mol. Which of the following statements are true concerning this reaction? Choose all that apply Heat moves from the system to the surroundings The reaction is endothermic Overall bond length has increased in the products The molecules in the system will slow down as the kinetic energy is converted to potential energy O The enthalpy of the products is lower than the enthalpy of the reactantsarrow_forward
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