Chemistry Unit Review

What is the total number of electrons in an atom of an element with an
atomic number of 18 and a mass number of 40?
a. 58
b. 40
c. 22
d. 18
Which Lewis dot diagram represents an atom of chlorine?
Which of the following is represented by the Bohr model below?
a. an atom of neon
b. an atom of oxygen
c. a molecule of oxygen
d. an oxygen ion
Which particle is found in the nucleus of every atom?
a. proton
b. electron
c. neutron
d. all of the above
Which of the following is true for Li+?
a. I and III only
b. I and IV only
c. II and III only
d. II and IV only
Covalent bonding involves the ____ of electrons, while ionic bonding
involves the ____ of electrons.
a. sharing; splitting
b. transferring; sharing
c. sharing; transferring
d. splitting; transferring
Which formula represents lead (II) phosphate?
a. PbPO4
b. Pb3(PO4)2
c. Pb4PO4
d. Pb2(PO4)3
When the reaction below is balanced, what is the coefficient of O 2?
a. 6
b. 2
c. 3
d. 4
Which of the following correctly balances the
10. Which of the following can conduct an electric current?
a. NaOH(s)
b. H2O(s)
c. CH3OH(aq)
d. HCl(aq)
11. A student recorded the following observations about an unknown solution:
 conducts electricity
 turns blue litmus red
The student should conclude that the unknown solution is most likely
a. an acid
b. a base
c. a molecular solution
d. a neutral solution
12. What is the molar mass of Ca3(PO4)2?
a. 215.21 g/mol
b. 246.18 g/mol
c. 278.18 g/mol
d. 310.18 g/mol
13. What is the concentration of O2(g), in parts per million, in a solution that
contains 0.00800 gram of O2(g) dissolved in 1000. grams of H2O?
a. 0.80 ppm
b. 80.0 ppm
c. 8.00 ppm
d. 800 ppm
Numerical response 1
The number of moles of AgCl dissolved in 300 mL of a 3.98 mol/L AgCl solution
is _____.
Numerical response 2
A sample of 0.250 mol/L AgNO3 solution contains 0.0770 mol of solute. The
volume of solution is ____ mL.
Numerical response 3
A student has 0.200 L of a 2.00 mol/L solution and adds water so the final
volume is 0.350 L. The final concentration is _____ mol/L.
14. In a redox reaction, the total number of electrons lost is
a. less than the total number of electrons gained
b. greater than the total number of electrons gained
c. equal to the total number of electrons gained
d. equal to the total number of protons gained
15. Which metal is more reactive than Ni and less reactive than Na?
a. Cu
b. Mg
c. Ca
d. Pb
16. Which energy conversion occurs in a voltaic cell?
a. chemical energy to electrical energy
b. chemical energy to nuclear energy
c. electrical energy to chemical energy
d. nuclear energy to electrical energy
17. Reduction occurs at the cathode in
a. electrolytic cells, only
b. voltaic cells, only
c. both electrolytic cells and voltaic cells
d. neither electrolytic cells nor voltaic cells
18. Which half-reaction correctly represents reduction?
a. Ag 
+ e–
b. Au + 3e  Au
c. F2  2 F– + 2e–
d. Fe2+ + e– 
19. The reaction 2H2O + electricity  2H2(g) + O2(g) is best described as
a. an electrolytic cell in which an exothermic reaction occurs
b. an electrolytic cell in which an endothermic reaction occurs
c. an voltaic cell in which an exothermic reaction occurs
d. an voltaic cell in which an endothermic reaction occurs
Numerical response 4
Identify the part of the electrochemical cell, as numbered above that corresponds
to the terms listed below.
external electron path
oxidizing agent
20. Given the equation C(s) + H2O(g) 
undergoes reduction?
a. C(s)
b. C+2
c. H+
d. H2(g)
+ H2(g), which substance
21. Which element is present in all organic compounds?
a. hydrogen
b. oxygen
c. nitrogen
d. carbon
22. What is the maximum number of covalent bonds that a carbon atom can
a. 1
b. 2
c. 3
d. 4
23. Name the compound below:
24. Name the compound below: