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Concept explainers
Interpretation:
The photochemical reaction that initiates the production of smog involves the decomposition of NO molecules, and the energy needed to break the N-O bond is
(a) The longest
(b) Number of photons needed to decompose 0.32 mg of NO should be calculated.
Concept introduction:
A
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Chapter 6 Solutions
Bundle: Chemistry for Engineering Students, 3rd, Loose-Leaf + OWLv2 with Quick Prep and Student Solutions Manual 24-Months Printed Access Card
- Of the five elements Sn, Si, Sb, O, Te, which has the most endothermic reaction? (E represents an atom.) What name is given to the energy for the reaction? E(g)E+(g)+earrow_forwardVery small semiconductor crystals, composed of approximately1000 to 10,000 atoms, are called quantum dots.Quantum dots made of the semiconductor CdSe are now beingused in electronic reader and tablet displays because theyemit light efficiently and in multiple colors, depending ondot size. The density of CdSe is 5.82 g/cm3.(a) What is the mass of one 2.5-nm CdSe quantum dot?(b) CdSe quantum dots that are 2.5 nm in diameter emitblue light upon stimulation. Assuming that the dot is aperfect sphere and that the empty space in the dot canbe neglected, calculate how many Cd atoms are in onequantum dot of this size.(c) What is the mass of one 6.5-nm CdSe quantum dot?(d) CdSe quantum dots that are 6.5 nm in diameter emitred light upon stimulation. Assuming that the dot is aperfect sphere, calculate how many Cd atoms are in onequantum dot of this size.(e) If you wanted to make one 6.5-nm dot from multiple 2.5-nm dots, how many 2.5-nm dots would you need, andhow many CdSe formula units would be…arrow_forwardThe reaction of a metal, M, with a halogen, X2, proceeds by an exothermic reaction as indicated by this equation: M(s) + X2(g) ⟶ MX2(s). For each of the following, indicate which option will make the reaction moreexothermic. Explain your answers.(a) a large radius vs. a small radius for M+2(b) a high ionization energy vs. a low ionization energy for M(c) an increasing bond energy for the halogen(d) a decreasing electron affinity for the halogen(e) an increasing size of the anion formed by the halogenarrow_forward
- Boron, atomic number 5, occurs naturally as two isotopes, 10B and 11B, with natural abundances of 19.9% and 80.1%, respectively. (a) In what ways do the two isotopes differ from each other? Does the electronic configuration of 10B differ from that of 11B? (b) Draw the orbital diagram for an atom of 11B. Which electrons are the valence electrons? (c) Indicate three ways in which the 1s electrons in boron differ from its 2s electrons. (d) Elemental boron reacts with fluorine to form BF3, a gas. Write a balanced chemical equation for the reaction of solid boron with fluorine gas. (e) ΔHf° for BF3(g) is -1135.6 kj/mol. Calculate the standard enthalpy change in the reaction of boron with fluorine. (f) Will the mass percentage of F be the same in 10BF3 and 11BF3? If not, why is that the case?arrow_forwardWhich of the following reactions represents an electron gain energy that would be positive (i.e. endothermic). O(g) → O+(g) + e- Ne(g) + e- → Ne-(g) O(g) + e- → O-(g) I(g) → I+(g) + e- I(g) + e- → I-(g) Ne(g) → Ne+(g)+ e- fast plzarrow_forwardAssign reason to the following :(i) Noble gases have large positive values of electron gain enthalpy.(ii) Helium is used by scuba divers.arrow_forward
- Boron, atomic number 5, occurs naturally as two isotopes, 10B and 11B, with natural abundances of 19.9% and 80.1%, respectively.(a) In what ways do the two isotopes differ from each other? Does the electronic configuration of 10B differ from that of 11B? (b) Drawthe orbital diagram for an atom of 11B. Which electrons are the valence electrons? (c) Indicate three ways in which the 1s electrons inboron differ from its 2s electrons. (d) Elemental boron reacts with fluorine to form BF3, a gas. Write a balanced chemical equation forthe reaction of solid boron with fluorine gas. (e) ΔHf° for BF31g2 is -1135.6 kJ>mol. Calculate the standard enthalpy change in thereaction of boron with fluorine. (f) Will the mass percentage of F be the same in 10BF3 and 11BF3? If not, why is that the case?arrow_forward(3a-104-17) Would you agree to buy 1.23 x 1021 platinum atoms for $17? Explain why or why not, showing all work. The current price of platinum is 30.71 dollars/gram.arrow_forwardCs is used in photocells and television cameras because it has a very low ionization energy, corresponding to photons with a wavelength of 6,600 Å (photoelectric material). What is the kinetic energy of an electron detached from Cs with a light of 5,000 Å? (1 J = 0.24 cal)arrow_forward
- O ELECTRONIC STRUCTURE ... Understanding the definitions of ionization ener... Consider the following data for carbon: atomic mass electronegativity electron affinity ionization energy heat of fusion Explanation Check 12.011 2.55 153.9 1086.5 mol 1 kJ mol kJ mol kJ mol Ⓒ2023 McGraw Hill LLC. All Rights Reserved. 0/3 Andrew ? E olo Ar Terms of Use | Privacy Center Accessibilityarrow_forward(B) 0.832 mL (C) 1.20 mL (D) 8.59 mL 2. Consider the Bohr Model of Phosphorus below. Which statement is FALSE? (A) The electrostatic potential energy of ALL electrons is negative. (B) The electrons with the least potential energy are closest to the nucleus. (C) Energy is released when the electron is ejected from the atom. (D) When an electron is infinitely far from the nucleus, the electrostatic potential energy is 0.arrow_forward(ii) Draw the Born-Haber cycle and use the data below for the formation of calcium chloride, to calculate the electron affinity of chlorine: Ca(s) → Ca(g) AHat = +190 kJ/mol Ca(g) > Caz*(g) + 2e¨ AH¡ɛ = +1730 kJ/mol Cl2{g) 2C1(g) AHat = +121 kJ/mol Caz (g) + 2Cl(g) > CaCl2(s) AHLE = -2184 kJ/mol Ca(s) + Cl2(g) –> CaCl2(s) AH; = -795 kJ/molarrow_forward
- Chemistry for Engineering StudentsChemistryISBN:9781337398909Author:Lawrence S. Brown, Tom HolmePublisher:Cengage LearningChemistry by OpenStax (2015-05-04)ChemistryISBN:9781938168390Author:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark BlaserPublisher:OpenStax
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