Practice Prelim #2 - CHEM 1007: Optional practice problems...

This preview shows page 1 - 2 out of 10 pages.

The preview shows page 1 - 2 out of 10 pages.
CHEM 1007:Optional practice problems for the second chem 2070 prelim examThe following questions come from several sources.Most come from other generalchemistry textbooks.None of these questions were written by Professors Zax or Abruna.These questions are not meant to cover every topic that may be on the prelim, buthopefully these questions will provide some review and problem-solving practice.1.The first electron affinity of bromine (Br) releases 324.6 kJ/mole (H = -324.6 kJ/mole ).Theproduction of gaseous bromine ions from bromine molecules can be considered a two-step process inwhich the first step involves dissociating Br2(g) to make 2Br(g), requiring 193 kJ/mole.Br2(g)2Br(g)H = +193 kJ/moleDoes the formation of Br-(g) from Br2(g) release energy (exothermic) or require added energy(endothermic)?How much energy is added or released in the process of producing one mole of Br-(g)?2.Given the table of electron affinities and ionization energies belowElementFirst ionization energyFirst electron affinityIon RadiusChlorine (Cl)2.08 aJ-0.580 aJ133 pmSodium (Na)0.83 aJ0.088 aJ102 pm(a)Calculate the energy released in the following process: Na(g) + Cl(g)Na+(g) + Cl-(g)(b)Calculate the energy released in the following process: Na(g) + Cl(g)Na+Cl-(g)3.Using the table of values in problem #2.When sodium chloride (NaCl) is heated in a flame, theflame takes on a yellow color.Calculate the energy associated with this reaction, shown below.The reaction that occurs in the gaseous state is:Na+(g) + Cl-(g)Na(g) + Cl(g)Find the wavelength of light that emits this energy in one photon.4.Write Lewis structures that show shape for the following molecules.Give the approximate bondangle in each molecule and state whether or not the molecule is polar.(a) SiF4(b) XeF5(C) SOCl2(d) TeF4(e) NO3-(f) SCl25.In the XF5-structure below, element “X” is in the 5thperiod.Identify element “X” based on thenumber of valence electrons in the ion.Then redraw the Lewis structure of the molecule (replacingX with the actual atom symbol) using lines, wedges, and dashes to indicate the molecular shape.Give the name of the molecule’s molecular shape.Give the approximate bond angles in themolecule around the center atom.+

Upload your study docs or become a

Course Hero member to access this document

We have textbook solutions for you!
/Organic-Chemistry-8th-Edition-9781305580350-593/
The document you are viewing contains questions related to this textbook.
Chapter 5 / Exercise 5.12
Organic Chemistry
Brown
Expert Verified

Upload your study docs or become a

Course Hero member to access this document

End of preview. Want to read all 10 pages?

Upload your study docs or become a

Course Hero member to access this document

Term
Fall
Professor
JOHNSON
Tags
Chemistry, Atom, Periodic Table, Central Atom, GEOMETRIC ISOMERS, optical isomers
We have textbook solutions for you!
The document you are viewing contains questions related to this textbook.
Organic Chemistry
The document you are viewing contains questions related to this textbook.
Chapter 5 / Exercise 5.12
Organic Chemistry
Brown
Expert Verified

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture