Chem 1115 Unit 2 Practice Problems

 

1.      Give the information requested for  65Zn2+

                                                                                    30

atomic number =                       __________

mass number =                         __________

# of protons =                             __________

# of neutrons =                           __________

# of electrons =                          __________

 

2.      A particular chemical species has 46 neutrons, 36 electrons, and a mass number of 81.  Give the information requested below:

 

Atomic number =     __________

# of protons =           __________

 

Nuclear symbol        __________

 

3.      Give the names for the following compounds.  (Note:  These are ones you should be able to name using the ions you have memorized.)

Na2CO3                                                                             Fe2O3

AgNO3                                                                                                         Ca3N2

BaCl2                                                                                                           FeCl2

Al2(SO4)3                                                                                                   Zn(C2H3O2)2

Mg(OH)2                                                                                                    

 

4.      Give the correct formula for the following compounds (Note: same as 3):

 

Silver sulfate                                                                     Iron (II) phosphate

Barium acetate                                                                 Cesium fluoride

Aluminum carbonate                                                         Ammonium sulfide

Sodium bicarbonate                                                          Sodium cyanide

 

5.      Name the following compounds.  You may need the ion chart.

 

KMnO4                                                                                                        Na2SO3

Na2CrO4                                                                                                     CuO

Pb(SO4)2                                                                                                   (NH4)3PO3

PbSO4                                                                                                         Ca(ClO4)2

CoCl3                                                                                                           KClO

BiCl5                                                                                                            

 

6.      Write the formula for each compound.  You may need the ion chart.

 

Potassium phosphite                                                        Ammonium perchlorate

Tin (IV) carbonate                                                             Cadmium phosphate

Cobalt (II) bromate                                                            Copper (I) sulfide

 

7.      Draw the orbital diagram for the following:

a.   Si

b.   Zn

  1. the ion formed by Rb

8.      Write the electron configuration for the following:

a.   Ba

b.      Sc

 

9.      Write the electron configuration using core notation for the following:

a.   Y

b.   O

c.      the ion formed by Br

 

10.  Consider each pair separately.  Which substance in each pair has the larger radius?

a.   Ca vs. Ba

b.   Br – vs. Br

c.   Li+ vs. Li

d.   S2- vs. Ca2+

e.   B vs. F

 

11.  Consider each pair separately.  Which substance in each pair has greater metallic character?

 

a.   S vs. Mg

 

12.  Consider each pair separately.  Which substance in each pair has the largest ionization energy?

 

a.   S vs. Mg

b.   Mg vs. Ca

 

13.  Consider each pair separately.  Which substance in each pair has the most negative electron affinity (i.e. will gain an electron most easily)?

 

a.   S vs. Mg

 

14.  Is each of the following sets of quantum numbers an allowed set?  If not, why not?

 

a.   n = 4, l = 2, ml = -1

b.      n = 3, l = 0, ml = 2

 

15.  Which of the following statements describes some aspect of the QM model of the atom?

a.            Electrons have a wave-like properties.

b.            If the energy of an electron is known for certain, then its exact location can be found as well.

c.            Three quantum numbers are used to describe an orbital.

d.            Electrons are found in circular orbitals around the nucleus.

e.            The azimuthal quantum number describes the energy of an electron.

 

16.  What are the quantum numbers associated with the following subshells:

      a.   1s

      b.   2p

      c.   3d

 

17.  Urea, which contains 46.65% nitrogen by weight, is commonly used as a fertilizer in agriculture.  To grow wheat, 2.00 lbs of nitrogen are needed to produce 1 bushel of wheat.  Use dimensional analysis to calculate the number of tons of urea that Dr. Bailey must spread on her 152 acre wheat farm if she wants to produce 50.0 bushels of wheat per acre.  (2000 lb = 1 ton)