# Middlesex Community College Solve the Temperature Conversions Chemistry Questions

Energy Quiz (1)Name __________________________
For this quiz, only submit one (1) page and submit it as a pdf.
1. Solve the following temperature conversions. Show all equations and work.
a. -20 oF =
o
C
b. 174 K =
o
F
c. 65 oC =
o
F
2. a. Calculate the energy in kilocalories from the process of heating 85.0 g of water
from 15.0 oC to 65.0 oC. Show all equations, work, correct units, and significant figures.
b. Was heat added or released?
3. a. Calculate the heat in kilojoules to condense 27.2 g of water at 100 oC.
Show all equations, work, correct units, and significant figures.
b. Was heat added or released?
Chapter 2 Energy
Practice Quiz Answer Key
1. Solve the following temperature conversions:
a.
-14 oC =
7 oF
o
F = 1.8 oC + 32
o
F = 1.8 (-14 oC) + 32
b.
-14 oF =
o
F – 32
1.8
=
-26 oC
o
(-14 oF) – 32
1.8
c.
137 K =
Step 1:
C
=
o
C
-213 oF oF
o
C = 137 K – 273
o
C = -136 oC
Step 2:
o
F = 1.8 (-136 oC) + 32
o
F = -213 oF
2. How many kilocalories (kcal) are in one Fenway Frank hot dog, if the hot dog has
2 g of carbs, 6 g of protein, and 13 g of fat?
4 kcal x 2 g carbs =
1g carbs
1
8 kcal
4 kcal x 6 g protein =
1g protein
1
24 kcal
9 kcal
1g fat
117 kcal
x 13 g fat =
1
149 kcal
150 kcal
3. Calculate the heat in kilojoules to freeze 65 g of water at 0 oC.
Was heat added or released?
Given
Solving for
65 g
1
kJ
Setup
1 kJ
1000 J
x
4.185 J
1 cal
x 80 cal
1g
x
65 g
1
=
21.7568 kJ
22 kJ
4. Calculate the heat in kilocalories for the process of heating 45.0 g of water
from 112 oC to 185 oC. Was heat added or released?
Given
Solving for
(185-112) oC = 73 oC
45.0 g
1
kcal
Setup
1 kcal
1000 cal
x
1 cal x 73 oC
o
C g
1
x
45.0 g
1
=
3.285 kcal
3.23 kcal
Chapter 2 Energy
Practice Quiz Answer Key
1. Solve the following temperature conversions:
a.
-14 oC =
7 oF
o
F = 1.8 oC + 32
o
F = 1.8 (-14 oC) + 32
b.
-14 oF =
o
F – 32
1.8
=
-26 oC
o
(-14 oF) – 32
1.8
c.
137 K =
Step 1:
C
=
o
C
-213 oF oF
o
C = 137 K – 273
o
C = -136 oC
Step 2:
o
F = 1.8 (-136 oC) + 32
o
F = -213 oF
2. How many kilocalories (kcal) are in one Fenway Frank hot dog, if the hot dog has
2 g of carbs, 6 g of protein, and 13 g of fat?
4 kcal x 2 g carbs =
1g carbs
1
8 kcal
4 kcal x 6 g protein =
1g protein
1
24 kcal
9 kcal
1g fat
117 kcal
x 13 g fat =
1
149 kcal
150 kcal
3. Calculate the heat in kilojoules to freeze 65 g of water at 0 oC.
Was heat added or released?
Given
Solving for
65 g
1
kJ
Setup
1 kJ
1000 J
x
4.185 J
1 cal
x 80 cal
1g
x
65 g
1
=
21.7568 kJ
22 kJ
4. Calculate the heat in kilocalories for the process of heating 45.0 g of water
from 112 oC to 185 oC. Was heat added or released?
Given
Solving for
(185-112) oC = 73 oC
45.0 g
1
kcal
Setup
1 kcal
1000 cal
x
1 cal x 73 oC
o
C g
1
x
45.0 g
1
=
3.285 kcal
3.23 kcal

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