Concept explainers
Interpretation:
The given statements are true or false is to be explained.
Concept introduction:
Bond enthalpy is the energy released when one mole of a bond is broken.
Octet rule states that every element present in the maingroups should have eight electrons in its valence shell in order to attain a noble gas configuration.
Change of enthalpy of reaction is given by the difference of bond enthalpies of the products and bond enthalpies of the reactants.
For variousmolecules, it is impossible to explain all their properties by a single Lewis structure. In such cases, more than one Lewis structures are drawn. Such a structure of a compound is called a resonating structure and this phenomenon is called resonance.
Resonance structures areimaginary structures and not real ones.
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Chemistry
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- With reference to the “Chemistry Put to Work” box on explosives, (a) use bond enthalpies to estimate the enthalpy change for the explosion of 1.00 g of nitroglycerin. (b) Write a balanced equation for the decomposition of TNT. Assume that, upon explosion, TNT decomposes into N2(g), CO2(g), H2O(g), and C(s).arrow_forwardCyanogen (CN)2 is known as pseodohalogen because it has some properties like halogens. It is composed of two CN’s joined together.(i) Draw the Lewis structure for all the possible combination for (CN)2.(ii) Calculate the formal charge and determine which one of the structures that you have drawn is most stable.(iii) For the stable structure, determine the geometry around the two central atoms.(iv) For the stable structure, draw the dipole arrows for the bonds.(v) Base on the stable structure, determine the polarity of molecule and state your reason.arrow_forwardUse Lewis electron-dot symbols to represent the formationof (a) BrF₃ from bromine and fluorine atoms; (b) AlF₃ from alu-minum and fluorine atoms.arrow_forward
- The hypochlorite ion, ClO-, is the active ingredient inbleach. The perchlorate ion, ClO4-, is a main componentof rocket propellants. Draw Lewis structures for both ions. (a) What is the formal charge of Cl in the hypochlorite ion?(b) What is the formal charge of Cl in the perchlorate ion, assumingthe Cl—O bonds are all single bonds? (c) What is theoxidation number of Cl in the hypochlorite ion? (d) Whatis the oxidation number of Cl in the perchlorate ion, assumingthe Cl—O bonds are all single bonds? (e) In a redox reaction,which ion would you expect to be more easily reduced?arrow_forward(b) Methyl azide, CH-N3 is a molecule that decomposes explosively. Draw a Lewis structure for CH3N3, showing formal charges and also sketch any possible resonance forms.arrow_forwardCalculate the enthalpy change for the following reactions using the bond enthalpy given below. (Bond enthalpy/kJ : H−H = 436, C−H = 413, C=O = 799, O=O = 495, O−H = 463) (a) H2(g) + 1⁄2O2(g) → H2O(g) (b) CH4(g) + 2O2(g) → CO2(g) + 2H2O(l)arrow_forward
- Which of these statements about resonance is true?(a) When you draw resonance structures, it is permissibleto alter the way atoms are connected.(b) The nitrate ion has one long N¬O bond and two shortN¬O bonds.(c) “Resonance” refers to the idea that molecules areresonating rapidly between different bonding patterns.(d) The cyanide ion has only one dominant resonancestructure.(e) All of the above are true.arrow_forwardWhich set of ionic compounds shows the correct order of increasing lattice energy (lowest-to-highest). (A) CaO < MgO < CaCl2 < MgCl2; (B) MgO < MgCl2 < CaO < CaCl2; (C) MgO < CaO < MgCl2 < CaCl2; (D) CaCl2 < MgCl2 < CaO < MgOarrow_forwardWhich compound in each of the following pairs has the larger lattice energy? Note: Mg2+ and Li+ have similar radii; O2– and F– have similar radii. Explain your choices.(a) MgO or MgSe(b) LiF or MgO(c) Li2O or LiCl(d) Li2Se or MgOarrow_forward
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