Download Final Review Fall 2013_Answer Key (pg.1

Chemistry Study Guide for Final Exam
A. Density:
1. What is the identity of a metal with a density of 19.31 g/mL?
Gold
2. What is the identity of a metal with a mass of 5.3 grams and a volume of 1.18 mL?
4.49; Titanium
B. Define the following terms.
1. Atomic Number: _______# PROTONS_______________________
2. Mass Number: _________# PROTONS + # NEUTRONS_______________________
3. Isotope: atoms of the same element that have different numbers of neutrons
4. Ion: _____CHARGED ATOMS (ELECTRONS HAVE BEEN LOST OR GAINED) _______
C. Find the number of protons, neutrons, and electrons:
1. A potassium atom that has an atomic number of 19 and a mass number of 39.
__19___ protons, ____19__ electrons, __20____ neutrons
2. An oxygen ion has an atomic number of 8 and a mass number of 16. O2_8____ protons, ___10___ electrons, ___8___ neutrons
3. A sodium ion has an atomic number of 11 and a mass number of 23. Na1+
__11___ protons, ___10___ electrons, ___12___ neutrons
4. How many neutrons do the following have?
a. 12 C
6
b. 106Ag 59
D. Determine the Percentage Composition (by mass) of each of the compounds below.
1. MgBr2
2. (NH4)2S
Mg:__13.2%___
N: __41.1%___
Br:__86.7%___
H:___11.75%__
S:___47.1%__
E. How many energy levels are needed to hold the electrons of each of the following elements?
1. Ca 4
2. Al 3
3. He 1
4. I 5
F. What is the oxidation number of each of these elements?
1. Calcium 2+
4. Cesium 1+
2. Nitrogen 35. Boron 3+
3. Chlorine 16. Helium 0
G. Write the abbreviated electron configuration and the orbital notation diagram for the
following elements.
1. Lithium [He]2s1
2. Strontium [Kr]5s2
3. Aluminum [Ne]3s23p1
4. Bromine [Ar]4s23d104p5
5. In what block does the element with the electron configuration [Xe] 6s24f145d9 belong?
D block
6. Fill in the Valance electron configuration of Aluminum:
3s _____ 3p _____
______ ______
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H. Ionic and Covalent Compounds: (Circle Correct Answer in Brackets)
1. Ionic compounds tend to have [higher / lower] melting points than covalent compounds.
2. Ionic compounds are generally [solids / liquids / gases] at room temperature.
3. Nonpolar covalent compounds are generally [solids / liquids / gases] at room temperature.
4. Which are more soluble in water (in general)? [ionic compounds / nonpolar covalent compounds]
I. Name the following compounds (Determine if it is ionic, covalent, or acid first).
1. PBr3: __phosphorus tribromide____
2. CuCl2: __copper (II) chloride___
3. Mg(NO3)2: _magnesium nitrate_
4. CaSO4: __calcium sulfate___
5. LiBr: __lithium bromide___
6. FeO: __iron (II) oxide___
7. NH4Cl: _ammonium chloride___
8. CO: __carbon monoxide___
9. Fe2O3: __iron (III) oxide__
10. N2O5: __dinitrogen pentoxide__
11. AgCl: __silver chloride__
12. ZnCl2: __zinc chloride____
13. SO3: __sulfur trioxide__
14. MgO: ___magnesium oxide___
15. H2O: _dihydrogen monoxide____
16. CCl4: __carbon tetrachloride___
17. H2SO4: __sulfuric acid__
18. HCl: __hydrochloric acid__
19. NaOH: __sodium hydroxide___
20. NH3: _ammonia____
J. Write the formula of each compound named below (Determine if it is ionic, covalent, or acid
1.
2.
3.
4.
5.
6.
7.
8.
9.
Calcium chloride: _CaCl2__
Aluminum sulfate: _(NH4)2SO4__
Lead (IV) chloride: _PbCl4__
Lithium sulfide: _Li2S___
Ammonium phosphate:(NH4)3PO4
Ammonium phosphide: (NH4)3P
Diphosphorus pentoxide: _P2O5
Aluminum oxide: __Al2O3__
Sodium carbonate: __Na2CO3_
10. Aluminum sulfite: _Al2(SO3)3__
11. Chromium (II) sulfide: _CrS_
12. Potassium nitride: __K3N__
13. Sulfur hexachloride: _SCl6_
14. Magnesium iodide: _MgI2_
15.
16.
17.
18.
Hydrobromic acid: __HBr__
Sulfuric acid: __H3SO4____
Calcium hydroxide: __Ca(OH)2___
Nitrous acid: __HNO2____
K. Shapes of Molecules: Based on the vesper theory what are the molecular geometries of the
following molecules:
a. H2O bent
b. CO2
linear
c. CH4 tetrahedral
L. Balance these equations!
Single Replacement or Double Replacement?
1.
_1_FeCl3 + _3_NaOH  _1Fe(OH)3 + _3_NaCl
2.
_1_C3H8 + _5_O2
 _3_CO2 + _4_H2O
3. _2_Ag2O  _4_Ag + _1_O2
d. BH3 trigonal planar
Classification: __double_
Classification: ___combustion__
Classification: __decomposition___
4. _1_S8 + _12_O2  _8_SO3
Classification: ___synthesis__
5. _2_K + _1_MgBr2  _2_KBr + _1_Mg
Classification: __single___
6. Which of the following will likely undergo a single replacement reaction?
Na and BaI2 / Zn and BaI2 / Ca and BaI2 / K and BaI2
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