Download Practice Test 2

Chem 10: Practice Test, Fall 2010 ( Practice electromagnetic spectrum also)
Test # 2: Ch 9,10,5,7
1.
A)
B)
C)
D)
Which of the following is a double-displacement reaction?
(NH4)2SO3  2NH3 + H2O + SO2
Br2 + 2Kl  2KBr + I2
2Na + Cl2  2NaCl
Al(OH)3 + 3 HCl  AlCl3 + 3 H2O

2. When the equation PbO2 
 PbO + O2 is balanced, one of the terms in the balanced
equation is
A) PbO2
B) 3 O2
C) 3 PbO
D) O2
3. When the equation Al(OH)3 + H2SO4  Al2(SO4)3 + H2O is completed and balanced, the sum of
the coefficients will be
A) 9
B) 10
C) 11
D) 12
4.
A)
B)
C)
D)
Which of the following statements is not true during a chemical reaction?
Total mass is conserved.
The total number of atoms are conserved.
The total number of molecules are conserved.
Energy is involved.
5. Which equation is incorrectly balanced?
A)

2 KNO3  2 KNO2 + O2
B) H2O2  H2O + O2
C) 2 Na2O2 + 2 H2O  4 NaOH + O2
D)
Electrical energy
2 H2O
 2 H2 + O2
H 2SO 4
6. Methanol, CH3OH, combusts in air to produce carbon dioxide and water vapor according to the
following unbalanced equation:
___ CH3OH(l) + ___ O2(g)  ___ CO2(g) + ___ H2O(g)
A)
B)
C)
D)
If 6 moles of CH3OH are burned in this way, how many moles of water will result?
4
6
8
12
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Chem 10: Practice Test, Fall 2010 ( Practice electromagnetic spectrum also)
Test # 2: Ch 9,10,5,7
7.
A)
B)
C)
D)
All of the following are endothermic except
boiling water
melting ice
condensing water vapor
reaction inside an ice pack
8. Incomplete combustion of methane produces carbon monoxide and water.
CH4(g) + O2(g)  CO(g) + H2O(l)
A)
B)
C)
D)
The coefficient of O2 in the balanced equation is
4
3
2
6
9.
A)
B)
C)
D)
The reaction of NH4Cl(aq) with KOH(aq) produces
KCl(aq) and NH4OH(aq)
KCl(aq) and NH3(g)
KCl(aq), NH3(g) and H2O(l)
KClO(aq), NH3(g) and H2(g)
10. Choose the set of coefficients which balances the chemical equation given below.
N2O5 + B2O3 + H2O  B3N3H6 + O2
A) 6, 5, 5, 2, 15
B) 3, 3, 3, 5, 2
C) 3, 3, 6, 2, 15
D) 2, 1, 1, 5, 1
11. Water is formed in a neutralization reaction. True/False
12. Synthesis reactions contain more products than reactants; decomposition reactions contain more
reactants than products. True/False
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Chem 10: Practice Test, Fall 2010 ( Practice electromagnetic spectrum also)
Test # 2: Ch 9,10,5,7
13
True/
False
16.
A)
B)
C)
D)
When the equation Al(ClO3)3  AlCl3 + O2 is balanced, the coefficient of O2 will be 6.
Which one of the following combinations is incorrect?
H2SO4, sulfuric acid
KMnO4, potassium permanganate
CuSO4, copper sulfite
KIO3, potassium iodate
15.
A)
B)
C)
D)
The number of oxygen atoms in Al(C2H3O2)3 is
2
3
5
6
16.
A)
B)
C)
D)
Which one of the following combinations is incorrect?
FeO, iron (II) oxide
CCl4, carbon (IV) chloride
CuO, copper (II) oxide
CrCl3, chromium (III) chloride
17.
A)
B)
C)
D)
What is the charge on the manganese in KMnO4?
+1
+7
+6
–7
18.
A)
B)
C)
D)
The correct electron structure for 48Cd is
1s22s22p63s23p64s23d10
1s22s22p63s23p64s23d104p65s24d10
1s22s22p63s23p64s23d104p64d4
1s22s22p63s23p64s24p64d105s25d10
19.
A)
B)
C)
D)
The number of orbitals in a d sublevel is
3
5
7
No correct answer given
20.
A)
B)
C)
D)
The correct electron configuration for chromium is:
[Ar] 4s2 3d4
[Ar] 4s2 4d4
[Ar] 4s1 3d5
[Ar] 3d6
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Chem 10: Practice Test, Fall 2010 ( Practice electromagnetic spectrum also)
Test # 2: Ch 9,10,5,7
21.
A)
B)
C)
D)
As atomic number increases across a period, all of the following increase except
atomic radius
atomic mass
ionization energy
number of valence electrons
22. Which is not a correct Lewis-dot symbol for phosphorus, 15P?
A)
B)
C)
D)
a
b
c
d
23.
A)
B)
C)
D)
The number of electrons in a triple bond is
3
4
6
8
24.
A)
B)
C)
D)
Carbon dioxide, CO2, is a nonpolar molecule because
Oxygen is more electronegative than carbon.
The two oxygen atoms are bonded to the carbon atom.
The molecule has a linear structure with the carbon atom in the middle.
The carbon-oxygen bonds are polar covalent.
25. Which of the following is a correct Lewis structure?
A)
B)
C)
D)
a
b
c
d
26.
A)
B)
C)
D)
When an atom loses two electrons, it becomes an ion with a charge of
0
+2
-2
+4
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Chem 10: Practice Test, Fall 2010 ( Practice electromagnetic spectrum also)
Test # 2: Ch 9,10,5,7
7.
A)
B)
C)
D)
The atoms in an I2 molecule are held together by a(n)
ionic bond
coordinate covalent bond
covalent bond
halogen bond
28.
A)
B)
C)
D)
Which of the following is the most electronegative?
Na
Rb
Cl
Se
29. Which Lewis structure is incorrect?
A)
B)
C)
D)
a
b
c
d
30.
A)
B)
C)
D)
Which of the following is a polyatomic ion?
Al3+
N2
SO3
NO 3–
31.
A)
B)
C)
D)
The bond angle between fluorine atoms in CF4 is about
90°
105°
109°
180°
32.
A)
B)
C)
D)
Which of the following would be an incorrect formula?
NaCl
K2O
AlO
BaO
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Chem 10: Practice Test, Fall 2010 ( Practice electromagnetic spectrum also)
Test # 2: Ch 9,10,5,7
33. The total number of valence electrons in a nitrate ion, NO – , is
3
A) 12
B) 18
C) 23
D) 24
34.
A)
B)
C)
D)
[Kr]5s24d10 is the electron configuration for
Br
I
At
Cd
State whether the following statements are True or false. Answer on a scantron only.
1. The 4s energy sublevel fills before the 3d sublevel because the 4s is at a lower energy level.
2. The element represented by 1s22s22p63s23p4 has an atomic number of 16.
3.
represents the electron structure of chlorine.
4. s and p orbitals are completely filled in the family of elements known as halogens.
5. The covalent bond between two carbon atoms will be nonpolar.
6. A sulfide ion (S2–) has less electrons than a sulfur atom.
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Chem 10: Practice Test, Fall 2010 ( Practice electromagnetic spectrum also)
Test # 2: Ch 9,10,5,7
I.
II.
Draw the Lewis structures for the following: Complete all the columns of this table.-12 points
ClO3NF3
Total#of valence electrons=
Total # of valence electrons=
Lewis structure
Lewis structure
Molecular shape
Molecular shape
Electron pair geometry
Electron pair geometry
Bond angle
Bond angle
Write the correct electronic configuration and box diagram for:
1. chromium 2. Tin
III.Name the following compounds:
1. NaNO3 ____________________________
2. H2 S (aq) _____________________________
3. HClO4 (aq) _________________________
4. N2O5 ______________________________
5. Au2O3_____________________________
6. sucrose _________________________
7. copper(II) sulfate .pentahydrate _________________
8. FeCl3 _______________________________
9. ammonia ______________________
10. oxalate ion ___________________
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Chem 10: Practice Test, Fall 2010 ( Practice electromagnetic spectrum also)
Test # 2: Ch 9,10,5,7
IV. Explain the formation of aluminum fluoride from its elements. Show the transfer of electrons.-3
points
V.. Complete and balance the equations for these reactions.(12 points)
1)
CuBr2 + Cl2→ ?
2)
NaNO3→ NaNO2 + ?
+ ?
3) C6 H6 + O2 → ? + ?
VI. Change the following word equations into formula equations, balance them and give its
type.(6 points)
1) iron(III) chloride + sodium hydroxide _________ iron (III) hydroxide + sodium
chloride
2) nickel(II) phosphate + sulfuric acid_________ nickel(II) sulfate + phosphoric acid.
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