AP Chemistry Unit 8

Quiz
•
Science
•
11th Grade
•
Hard
Standards-aligned
Lisa Thompson
FREE Resource
15 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Using the equations below: C(s) + O2(g) → CO2(g) ∆H = –390 kJ Mn(s) + O2(g) → MnO2(s) ∆H = –520 kJ what is ∆H (in kJ) for the following reaction? MnO2(s) + C(s) → Mn(s) + CO2(g)
910
130
-130
-910
Tags
NGSS.HS-PS1-4
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Using the equations below Cu(s) + 1/2O2(g) → CuO(s) ∆H = –156 kJ 2Cu(s) + O2(g) → Cu2O(s) ∆H = –170 kJ what is the value of ∆H (in kJ) for the following reaction? 2CuO(s) → Cu2O(s) + 1/2O2(g)
142
15
-15
-142
Tags
NGSS.HS-PS1-4
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which of these processes represents a decrease in entropy?
sublimation of CO2
boiling water
condensation of steam on cold glass
NaCl dissolving in water
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which of these reactions shows a DECREASE in entropy?
CaCO3(s) → CaO(s) + CO2(g)
3O2(g) → 2O3(g)
2NH3(g) → 3H2(g) + N2(g)
C6H6(l) → C6H6(g)
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A reaction has a positive ΔH and a positive ΔS. Which of the following is true?
It will be spontaneous at all temperatures.
It will be nonspontaneous at all temperatures.
It will be spontaneous at low temperatures.
It will be spontaneous at high temperatures.
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Your enthalpy is high and negative but your entropy is also negative. What type of temperature would you want to get a spontaneous reaction?
low
high
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which combination of ΔH and ΔS NEVER has a spontaneous reaction?
+ΔH and +ΔS
+ΔH and -ΔS
-ΔH and -ΔS
-ΔH and +ΔS
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