Unit 2 Review
Definitions:
Atoms
Subatomic Particles
Cathode Rays
Radioactivity
Nuclear Model
Nucleus
Protons
Neutrons
Electrons
Electronic Charge
Atomic Mass Units
Angstroms
Atomic Number
Mass Number
Isotopes
Atomic Weight
Mass Spectrometer
Periodic Table
Group
Period
Metallic Elements (metals)
Nonmetallic Elements
(nonmetal)
Metalloids
Molecules
Molecular Compounds
Diatomic molecule
Chemical formula
Empirical formula
Molecular Formula
Structural Formula
Ball-and-stick model
Space-filling model
Ions
Cations
Anions
Ionic compounds
Polyatomic ions
Chemical nomenclature
Oxyanions
Organic chemistry
Hydrocarbons
Alkanes
Alkene
Alkyne
Alcohol
Isomers
Atomic weight formula
Saturated vs Unsaturated hydrocarbon
I. Fluorine gas is bubbled through an aqueous solution of calcium bromate.
Besides water, this statement refers to which chemical formulas?
A) F2 and CaBr2
B) F and CaBr2
C) F2 and Ca(Br0 3h
D) F2 and CaBr03
2. Magnesium nitride reacts with water to form ammonia and magnesium hydroxide. Besides water, this
statement refers to which chemical formulas?
A) Mg 3N 2, NH 3, and Mg(OH)2
B) Mg(NO3)2, NH 4 +,and MgH2
C) Mg(N03)2, NH 3, and MgH 2
D) Mg 3N 2, NH 3, and MgOH
3. The mineral spinel is an ionic compound containing only the elements magnesium, aluminum, and
oxygen. Its simplest formula is probably
A) MgAlO3
B) Mg2AlO 4
C) MgAl2O4
D) Mg2Al2O3
4. The mineral chromite, FeCr2O4 , consists of a mixture of iron (ll) oxide and chromium ( III) oxide.
What is the most likely ratio of iron ( II) oxide to chromium( III) oxide in chromite?
A) 1:1
B) 1:2
C) 2:3
D) 3:2
5. Which formula represents a peroxide?
A) K2O
B) K2O2
C) KO2
D) CaO
6. What is the general formula for an alkaline earth metal hydride?
A) MH
B) M2H
C) MH2
D) M(OH)2
7. Which of the following compounds contains only four carbon atoms?
A) propane
B) butanoic acid
C) ethylmethyl ether
D) 2-pentanol
8.
Bromine has just two major isotopes giving it an atomic mass of 79.904 amu.
Based on this information, which of the following statements can explain the atomic mass value?
A) The isotope, Br-81, is more common than Br-79.
B) Br-79 and Br-81 exist in atom equal proportions.
C) Br-78 is about twice as abundant as Br-81.
D) The two major isotopes of Br have 45 and 46 neutrons.
9. Which is a collection of only molecular compounds?
A) NO, CS2, PCl3 , HBr
B) NaN0 3, CCl4, CuS
C) Ar, NH 3 , SF4, PCl5
D) Cl2, CCl4, N0 2, SF6
10. Which is true of the 243Am3+ ion?
Protons
Electrons
Neutrons
A) 148
148
243
B) 95
98
243
C)95
95
148
D) 95
92
148
Refer to the following information to answer Questions 11-16.
The mass spectrum of a natural abundance of chlorine atoms is shown in the figure:
80 -----------------601---
-- -----·-201---
0'---34
35
36
37
38
Mass
Detailed analysis shows that the two stable isotopes of chlorine have masses of
34.969 amu and 36.966 amu.
11. What are the mass numbers of the two isotopes of chlorine?
A) 34.969 and 36.966
B) 34 and36
C) 35 and 37
D) 17 and 17
12. What is the approximate %abundance of the lighter isotope?
A) 20
B) 25
C) 50
D) 75
13. How many types of molecules with different masses exist in a sample of chlorine gas is the sample
exists entirely as diatomic molecules?
A) 1
B) 2
C) 3
D) 4
14. What is the approximate mass of the most abundant naturally occurring Cl2 molecule?
A) 70
B) 71
C) 72
D) 74
15. How many neutrons does the less abundant chlorine atom have?
A) 17
B) 18
C) 19
D) 20
16. Why are the individual masses of the two isotopes, not integers?
A) Atomic mass of an element is the average mass of all isotopes.
B) The masses of a proton and a neutron are not integers.
C) Atomic mass of an element is the sum of the number of protons and neutrons in an atom.
D) Mass number of an element is the average mass of all isotopes.
17. A compound whose empirical formula is C2H4O has a molar mass that lies between 100 and 150 g/mol. What is the
molecular formula of the compound?
A) C2H4O
B) C4H8O2
C) C6H12O3
D) C6H12O2
I 8. Find the empirical formula for a compound only one element of which is a metal. The compound's percentage composition
by mass is 40.0% metal, 12.0% C, and 48.0% 0.
A) CaCO3
B) Na2CO3
C) NaHO3
D) Al2(CO3)3
Free Response Question(s)
1. Like Chlorine, iodine is a halogen and forms similar compounds. Write the names and formulas of the four
oxyanions and the four oxyacids of iodine. (See ion chart I gave you in class. Be sure to learn these ions)