Name
11am
1:30pm
PH 218 Exam II
Sample exam
I SHORT ANSWER
1. (16 pts) Fill in the blanks with the appropriate word or structure.
,
a. The three elementary particles in an atom are the
. Of these particles, the
and
,
is the lightest.
b. The mass number in a.m.u. units of an atom containing 42 neutrons, 34 protons and 34
electrons would be
. The atomic number of this element would be
and it would be in Group
. The symbol for this element
. This element’s properties would be similar to
is
Is it a metal or nonmetal?
. Give one property of this element:
c. Draw the Lewis Dot structure for this atom. Then draw the Lewis Dot structure for the ion it
produces (don’t forget to show the charge)
ATOM
ION
2. (10 pts)
a. Balance the chemical equation below.
Fe(s) +
H2O(l) Æ
Fe3O4 (s) +
H2(g)
b. Classify the reaction (i.e. synthesis, decomposition, etc.)
3. (12 pts) Write “true” or ‘”false” in front of each statement
If two atoms each contain different numbers of protons, the atoms must be from
different elements.
1
All carbon atoms have exactly 6 protons.
The atomic number of nitrogen is 14.01.
A positive ion forms when an atom gains a proton or loses an electron.
Halogens form anions with a +1 charge.
Isotopes are atoms of the same element that have a different numbers of neutrons.
IV MATCHING
4. (12 pts) The illustrations below depict various examples of matter at the atomic level. Match the
illustrations to the descriptions by placing a capital letter on the line by the illustration.
Note: descriptions may be used more than once or not at all.
A. diatomic element
B. mixture of two elements
C. a physical change
D. a chemical change
E. a mixture of an element & a
compound
F. a compound
G. a monatomic element
H. a mixture of two compounds
2
II MULTIPLE CHOICE
Place an x across the letter corresponding to the answer for each question (3 pts each).
5.
a
b
c
d
9.
a
b
c
d
6.
a
b
c
d
10.
a
b
c
d
7.
a
b
c
d
11.
a
b
c
d
8.
a
b
c
d
12.
a
b
c
d
5. The formula Al2(CO3)3 has
a. 9 oxygen atoms
b. 6 carbon atoms
c. 6 aluminum atoms
d. two of the above
6. Sulfur dioxide, SO2, would be the name of
a. two elements
b. a diatomic element
c. a compound
d. a mixture
7. An atom that has the same number of neutrons as
a.
b.
138
55
138
56
Ba is
Cs
Ba
136
56
c.
137
57
d.
136
54
La
Am
8. Which of the following collection of elements are nonmetals?
a. Na, K, Rb
c. O, Se, Po
b. F, Cl, Br
d. Cu, Ag, Au
9. What is the most common physical state of the elements at room temperature?
a. solid
c. gas
b. liquid
d. solution
10. What would be the electrical charge of a yttrium (#39) ion with 36 electrons?
a. –1
c. +1
b. –3
d. +3
11. Which of the following elements is a noble gas?
a. H
b. Rn
c. O
d. F
12. Which of the following compounds contains ions with a +3 charge?
a. Na2S
b. Al2S3
c. Mg3N2
d. two of the above
3
V PROBLEMS
13. (14 pts) The reaction of tin (# 50) with iodine, a solid, involves heating the iodine with a Bunsen
burner to produce iodine gas, which then flows down a glass tube containing the tin and reacts. After
the reaction is complete, a white powder remains in the tube.
a. Write the appropriate word equation for this reaction below.
b. Minnie runs this reaction and calculates that she has used 59.35 g of the tin to produce
313.15 g of the powder. What is the % composition of the powder she made? Show all your
work and use the rules for significant figures in your calculations.
c. From the information on the periodic table, predict the formula of the white powder.
d. Finally, based on your results from c) above, write an equation using chemical formulas
and all symbols for this reaction and balance it.
14. (9 pts)
a. Give the historical definition for an acid and base below.
ACID
BASE
4
b. Tina tests 3 clear, colorless liquids (X, Y, and Z) with red litmus paper, noting the color,
and then drops small pieces of magnesium metal into each. Her results follow. Use the
results to identify the liquids in the last column as acid, base or neutral
Liquid X
Liquid Y
Liquid Z
Red litmus
red
blue
red
Mg
nothing
nothing
bubbles
ID of liquid
EXTRA CREDIT In lab on Monday we did the Color Connection that was actually a Learning
Cycle lesson. Identify the phases of the Learning Cycle and explain what you did in each phase to
satisfy the requirements of that phase.
5
KEY
Name
PH 218 Exam II
Sample Exam
I.
Short Answer
1. (16 pts) Fill in the blanks with the appropriate word or structure.
electron
a. The three elementary particles in an atom are the
neutron
and
. Of these particles, the
,
electron
proton
,
is the lightest.
b. The mass number in a.m.u. units of an atom containing 42 neutrons, 34 protons and 34
electrons would be
34
. The atomic number of this element would be
and it would be in Group
Se
is
76
VI
. The symbol for this element
. This element’s properties would be similar to O, Te, S
Is it a metal or nonmetal?
nonmetal
. Give one property of this element:
c. Draw the Lewis Dot structure for this atom. Then draw the Lewis Dot structure for the ion it
produces (don’t forget to show the charge)
symbol = Se
Symbol = Se
6 dots
8 dots, bracket, charge = -2
ATOM
ION
2. (10 pts)
c. Balance the chemical equation below.
3 Fe(s) +
4
H2O(l) Æ
1
Fe3O4 (s) +
4
H2(g)
d. Classify the reaction (i.e. synthesis, decomposition, etc.)
Single displacement
3. (12 pts) Write “true” or ‘”false” in front of each statement
true If two atoms each contain different numbers of protons, the atoms must be from
different elements.
true
All carbon atoms have exactly 6 protons.
6
false
The atomic number of nitrogen is 14.01.
false
A positive ion forms when an atom gains a proton or loses an electron.
false
Halogens form anions with a +1 charge.
true
Isotopes are atoms of the same element that have a different numbers of neutrons.
IV MATCHING
4. (12 pts) The illustrations below depict various examples of matter at the atomic level. Match the
illustrations to the descriptions by placing a capital letter on the line by the illustration.
Note: descriptions may be used more than once or not at all.
A. diatomic element
H
B. mixture of two elements
C. a physical change
D. a chemical change
G
E. a mixture of an element & a
compound
F. a compound
G. a monatomic element
D
H. a mixture of two compounds
F
7
II MULTIPLE CHOICE
Place an x across the letter corresponding to the answer for each question (3 pts each).
5.
a
b
c
d
9.
a
b
c
d
6.
a
b
c
d
10.
a
b
c
d
7.
a
b
c
d
11.
a
b
c
d
8.
a
b
c
d
12.
a
b
c
d
5. The formula Al2(CO3)3 has
a. 9 oxygen atoms
b. 6 carbon atoms
c. 6 aluminum atoms
d. two of the above
6. Sulfur dioxide, SO2, would be the name of
a. two elements
b. a diatomic element
c. a compound
d. a mixture
7. An atom that has the same number of neutrons as
a.
b.
138
55
138
56
Ba is
Cs
Ba
136
56
c.
137
57
d.
136
54
La
Am
8. Which of the following collection of elements are nonmetals?
a. Na, K, Rb
c. O, Se, Po
b. F, Cl, Br
d. Cu, Ag, Au
9. What is the most common physical state of the elements at room temperature?
a. solid
c. gas
b. liquid
d. solution
10. What would be the electrical charge of a yttrium (#39) ion with 36 electrons?
a. –1
c. +1
b. –3
d. +3
11. Which of the following elements is a noble gas?
a. H
b. Rn
c. O
d. F
12. Which of the following compounds contains ions with a +3 charge?
a. Na2S
b. Al2S3
c. Mg3N2
d. two of the above
8
V PROBLEMS
13. (14 pts) The reaction of tin (# 50) with iodine, a solid, involves heating the iodine with a Bunsen
burner to produce iodine gas, which then flows down a glass tube containing the tin and reacts. After
the reaction is complete, a white powder remains in the tube.
a. Write the appropriate word equation for this reaction below.
∆
tin(s) + iodine(s) Æ white powder(s) OR…. tin(s) + iodine(g) Æ white powder(s)
b. Minnie runs this reaction and calculates that she has used 59.35 g of the tin to produce
313.15 g of the powder. What is the % composition of the powder she made? Show all your
work and use the rules for significant figures in your calculations.
tin(s) +
(59.35g) +
iodine(g) Æ white powder(s)
(X)
= (313.15g)
so X = 253.80 g
% tin = 59.35g/313.15g x 100 = 18.95%
% iodine = 253.80g/313.15g x 100 = 81.047 %
c. From the information on the periodic table, predict the formula of the white powder.
Sn will have a charge of +4; I will have a charge of -1. therefore the formula would be
SnI4
d. Finally, based on your results from c) above, write an equation using chemical formulas
and all symbols for this reaction and balance it.
Sn(s) + 2 I2(g) Æ SnI4(s)
14. (9 pts)
a. Give the historical definition for an acid and base below.
ACID
Tastes sour
Reacts with metals
Turns blue litmus red
Reacts with bases Æ neutrals
BASE
tastes bitter
feels slippery
turns red litmus to blue
reacts with acids Æ neutrals
9
b. Tina tests 3 clear, colorless liquids (X, Y, and Z) with red litmus paper, noting the color,
and then drops small pieces of magnesium metal into each. Her results follow. Use the
results to identify the liquids in the last column as acid, base or neutral
Liquid X
Liquid Y
Liquid Z
Red litmus
red
blue
red
Mg
nothing
nothing
bubbles
ID of liquid
N
B
A
EXTRA CREDIT In lab on Monday we did the Color Connection that was actually a Learning
Cycle lesson. Identify the phases of the Learning Cycle and explain what you did in each phase to
satisfy the requirements of that phase.
Identifies the 3 phases correctly in proper sequence = +2 pts
****Names the 3 phases but not in correct order = only +1
correct activity for each phase = +1 each for 3 pts
10