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WorksheetsTest 2 Review
Total questions: 28
Worksheet time: 45mins
Name
Class
Date
1.
The first law of thermodynamics states...
a)
the total amount of energy in the universe is constant, energy cannot be created or destroyed, only transferred or transformed
b)
The principle stating that every energy transfer or transformation increases the entropy of the universe. Ordered forms of energy are at least partly converted to heat.
c)
The entropy of a perfect crystal approaches zero at 0K. The law that states that in order for motion to stop we have to reach absolute zero
d)
if objects A and B are in thermal equilibrium with object C, then A and B are also in thermal equilibrium with each other
2.
Q>0 and W>0 means what as far as heat and work?
a)
Heat is added to the system; work is done by the surrounding onto the system
b)
Heat is taken away from the system; work is done by the surrounding onto the system
c)
Heat is taken away from the system; work is done by the system onto its surroundings
d)
Heat is added to the system; work is done by the system onto its surroundings
3.
Calculate the mole fraction of HCl in a solution of hydrochloric acid in water, containing 36% HCl by weight.
a)
0.15
b)
0.50
c)
0.22
d)
0.43
4.
Consider respiration, one of the most common
chemical reactions on earth.
C6H12O6+6O2→6CO2+6H2O+energy
What mass of carbon dioxide forms in the reaction of 25 grams of glucose with 40 grams of oxygen?
chemical reactions on earth.
C6H12O6+6O2→6CO2+6H2O+energy
What mass of carbon dioxide forms in the reaction of 25 grams of glucose with 40 grams of oxygen?
a)
36.6 grams
b)
42.3 grams
c)
25.6 grams
d)
14.5 grams
5.
When 20 g of Al (s) at 98 degrees Celsius is placed in 50 g of H2O, the final temperature is 26.5 degrees Celsius. What was the initial temperature of H2O?
Given: CspAl(s) = 0.903 J/g oC CspH20(l) = 4.18 J/g oC
Given: CspAl(s) = 0.903 J/g oC CspH20(l) = 4.18 J/g oC
a)
24.5 degrees celsius
b)
20.3 degrees celsius
c)
16.5 degrees celsius
d)
19.7 degrees celsius
6.
In a experiment, the initial volume and temperature of the gas is 0.5L at 5 degrees celsius. Assuming the pressure and moles of gas is constant, what is the volume of the gas if the temperature is increased to 80 degrees celsius?
a)
0.67 L
b)
0.59 L
c)
0.63 L
d)
0.65 L
7.
a)
846.7 kJ
b)
-890.7kJ
c)
764.8 kJ
d)
-764.8 kJ
8.
2NO(g)+O2(g)⇋2NO2(g)
Using the values in the table of standard enthalpies of formation, calculate the ΔH reaction for the formation of NO2(g).
O2(g): 0 kJ/mol
NO(g): 90.25 kJ/mo
NO2(g): 33.18 kJ/mol
Using the values in the table of standard enthalpies of formation, calculate the ΔH reaction for the formation of NO2(g).
O2(g): 0 kJ/mol
NO(g): 90.25 kJ/mo
NO2(g): 33.18 kJ/mol
a)
-114.1 kJ
b)
-141.1 kJ
c)
114.1 kJ
d)
141.1 kJ
9.
Use the changes in oxidation numbers to determine which elements are oxidized and which are reduced in these reactions. (Note: it is not necessary to use balanced equations)
Sb + HNO3 ---> Sb2O3 + NO + H2O
Sb + HNO3 ---> Sb2O3 + NO + H2O
a)
Oxidized:O Reduced:Sb
b)
Oxidized:N Reduced:O
c)
Oxidized:Sb Reduced:O
d)
Oxidized:Sb Reduced:N
10.
What instrument measures the pressure of gas in a lab?
a)
Thermometer
b)
Barometer
c)
Spectrotometer
d)
Manometer
11.
A system releases 622 kJ of heat and does 105 kJ of work on the surroundings. What is the change in internal energy of the system?
a)
-517 kJ
b)
-727 kJ
c)
517
d)
727
12.
Which of the following substances would show the greatest temperature upon absorbing 100.0 J of heat
a)
10.0g Au, CAu= 0.128 J/g*degrees C
b)
10.0g H2O, CH20= 4.18 J/g*degrees C
c)
10.0g Fe, CFe=0.449 J/g*degrees C
d)
10.0g Ag, CAg=0.235 J/g*degrees C
13.
Which of the following pairs of aqueous solutions will form a precipitate when mixed? Which of the following pairs of aqueous solutions will form a precipitate when mixed?
a)
Li2S + HI
b)
K2CO3 + HNO3
c)
MgCl2 + KOH
d)
HF+ LiOH
14.
An unknown gas effuses at a rate that is 0.462 times that of nitrogen gas (at the same temperature). Calculate the molar mass of the unknown gas in g/mol
a)
131 g
b)
141 g
c)
151 g
d)
161 g
15.
Which of the following is true about acids
a)
a weak acid is a strong electrolyte
b)
a weak acid does not fully ionize under a reaction
c)
a strong acid is a weak electrolyte
d)
a strong acid does not fully ionize under a reaction
16.
what is the oxidation number of N in HNO2
a)
+2
b)
+3
c)
-2
d)
-3
17.
What does Delta E represent?
a)
The heat of reaction
b)
The heat of the system
c)
measure of heat
d)
change in energy in a chemical reaction
18.
A 0.336 g sample of an unknown halogen occupies 48.4 mL at 398 K and 1.41 atm. What is the identity of the halogen?
a)
Cl2
b)
F2
c)
I2
d)
Br2
19.
A mixture of 15g of Ne and 5g of Ar has a total presure of 1.4 atm. What is the partial pressure of Ne?
a)
1.19
b)
1.34
c)
0.99
d)
1.11
20.
How much heat is needed to be added into the system to change the temperature of 231g of water from 35 to 67 degrees celsius?
a)
31000 J
b)
30900 J
c)
39000J
d)
30100J
21.
How many moles of Na are needed to make 4.5 liters of a 1.5 M Na solution?
a)
6.75 moles
b)
3 moles
c)
0.33 moles
d)
1.75 moles
22.
If you dilute 175 mL of a 1.6 M solution of LiCl to 1.0 L, determine the new concentration of the solution.
a)
0.33 M
b)
0.26 M
c)
0.31 M
d)
0.28 M
23.
Determine the mass of water formed when 8.5 L NH3 (at 298 K and 1.3 atm) is reacted with 34.9 L of O2 (at 323 K and 0.9 atm).
4 NH3(g) + 5 O2(g) ---> 4 NO(g) + 6H2O(g)
4 NH3(g) + 5 O2(g) ---> 4 NO(g) + 6H2O(g)
a)
12.21g
b)
14.56g
c)
11.34g
d)
15.01g
24.
2 H2S(g) + 3 O2(g) --> 2 H2O(l) + 2 SO2(g)
Use enthalpies to determine the delta H. State whether each reaction is endothermic or exothermic.
H2O(g); -241.8 kJ/mol
SO2(g); -296.1 kJ/mol
H2S(g); -20.1 kJ/mol
O2 (g); 0 kJ/mol
Use enthalpies to determine the delta H. State whether each reaction is endothermic or exothermic.
H2O(g); -241.8 kJ/mol
SO2(g); -296.1 kJ/mol
H2S(g); -20.1 kJ/mol
O2 (g); 0 kJ/mol
a)
-1035.6 kJ/mol; exothermic
b)
-1063.5 kJ/mol;endothermic
c)
-1035.6 kJ/mol; endothermic
d)
1456.7 kJ/mol; exothermic
25.
mmHg are the same units as?
a)
psi
b)
inHg
c)
STP
d)
torr
26.
A 25.5 liter balloon holding 3.5 moles of CO2 leaks. If we are able to determine that 1.9 moles of CO2 escaped before the container could be sealed, what is the new volume of the container
a)
13.8 L
b)
13.4 L
c)
12.8 L
d)
14.1 L
27.
Can you bring this calculator?
a)
NO
b)
YES
28.
HOW ARE WE FEELING Y'ALL?
a)
im scared
b)
im ready
c)
im iffy
d)
im out
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