Unit 12
Thermochemistry
19. A 10.0 gram sample of water (whose heat
capacity is estimated to be 4.0 J/goC) absorbs
150.0 J of heat, if its initial temperature was
15oC, what is its final temperature?
A.
T 
(4.0 J / g C )
(10.0 g )(150.0 J )
B.
T 
(150.0 J )
(10.0 g )( 4.0 J / g C )
C.
T 
(4.0 J / g C )(10.0 g )
(150.0 J )
D.
T 
(4.0 J / g C )(150.0 J )
(10.0 g )
20. When a student dissolved KBr in water,
the water got colder. Which of the following is
true?
A. KBr absorbed heat and water released
heat.
B. KBr absorbed heat and water absorbed
heat.
C. KBr released heat and water released
heat.
D. KBr released heat and water absorbed
heat.
21. Consider the following reaction: 2CH3OH (g) +
3O2 (g)  2CO2 (g) + 2H2O (g) ∆H = 1500kJ
If 15 mol CH3OH reacts completely with excess
oxygen, how many kJ of heat are released?
A.
15molCH 3 OH 
B.
15molCH 3 OH 
1500kJ
2molCH 3 OH
1500kJ
1molCH 3 OH
C.
2molCH 3OH
15molCH 3OH 
1500kJ
D.
15molCH 3OH 
1molCH 3OH
1500kJ
22. Which of the following is an example of an
endothermic process?
A) Melting
B) freezing
C) Boiling
D) both A and C
E) both B and C
23. How are heat and temperature related?
A) Temperature flows from cold objects to hot
objects but heat flows in the opposite
direction
B) Heat flows from cold objects to hot objects
but temperature flows in the opposite
direction
C) Temperature represents the average kinetic
energy of a substance
D) Heat represents the average kinetic energy
of a substance
E) Heat and temperature are the same thing
24. What metal has the lowest specific heat
capacity if equal masses of the metal were
subjected to the same amount of heat and
the following data were obtained?
A
B
C
Initial temperature
15
15
15
Final temperature
40
50
60
A) metal A
B) metal B
D) need additional information
C) metal C
Additional: On a hot day, the air feels hotter than the
water in the pool because;
A) Water has higher specific heat capacity
than air
B) Water has lower specific heat capacity
than air
C) Water and air have the same specific
heat capacity
D) Air absorbs more heat than water
Solution
Review
A.
B.
C.
D.
40M
3.0M
2.0M
1.5M
A.
B.
C.
D.
1500 mL
6700 mL
170 mL
1700 mL
Change the choices!
A.
B.
C.
D.
60g
40g
20g
15g
Change the choices!
A.
B.
C.
D.
E.
200. mL
300. mL
400. mL
500. mL
600. mL
A.
1mol
80.0 g 
 500.0mL
40 g
B. 80.0 g  500mL
C.
1mol
80.0 g 
 0.5L
40 g
D. 80.0 g  0.5 L
Organic Chemistry
62. Fill in the following table:
Defined As…
Formula…
Examples…
Alkanes Only single
bond
CnH2n+2
Methane, ethane.
Propane, butane
Alkenes At least one
double bond
CnH2n
Ethene (common
name ethylene)
Hexane, heptene,
octane
Alkynes At least one
triple bond
CnH2n-2
Ethyne, propyne,
butyne, pentyne
63. Fill in following table in regards to
functional groups:
Functional Group
Type of compound
Examples…
R – OH
alcohol
R-CHO
Aldehyde
R-O-R
R-C-O-O-R
Ether
-----
Ester
------
-----
63. Fill in following table in regards to
functional groups:
Functional Group
R-COOH
Type of compound
Examples…
Carboxylic acid
Ketone
----
R-NH2
Amines
----
R-X (X=F, Cl, Br, I)
Halide
-----
67. A carboxylic acid will have which of the
following functional groups?
A.
–OH
B.
–COOH
C.
–CHO
D.
–CH3
69. Draw the following organic compounds
using the both the structural and skeletal
formula:
Ex
A
B
Name
Molecular
Formula
Propane
C3H8
Ethene
2-Octyne
C2H4
C8H14
Structural formula
Line formula
69. Draw the following organic compounds
using the both the structural and skeletal
formula:
Name
Molecular
Formula
C
Pentane
D
1-butene
C5H12
C4H8
Structural formula
Line formula
Additional: Circle and label all the
functional groups for the following
structures:
Structure
A
Functional groups
Alcohol
Ether
amine
Morphine
Additional: Circle and label all the
functional groups for the following
structures:
Structure
C
Functional group
Carboxylic acid
Ester
aspirin