Enthalpy Changes of Reactions

Quiz
•
Science
•
12th Grade
•
Hard
Standards-aligned
Lisa Thompson
Used 1+ times
FREE Resource
15 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The following equations show the oxidation of carbon and carbon monoxide to carbon dioxide. C(s) +O2(g) → CO2(g) ΔH = –x kJ mol–1 CO(g) + O2(g) → CO2(g) ΔH = –y kJ mol–1 What is the enthalpy change, in kJ mol–1, for the oxidation of carbon to carbon monoxide? C(s) + O2(g) → CO(g)
x + y
-x - y
y - x
x - y
Tags
NGSS.HS-PS1-4
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
ΔH means:
temperature
calorimetry
enthalpy
syntropy
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A positive ΔH means that:
In order for the reaction to happen, heat must be input. It is exothermic
In order for the reaction to happen, heat must be input. It is endothermic.
When the reaction happens, heat is released. It is exothermic
When the reaction happens, heat is released. It is endothermic
Tags
NGSS.HS-PS3-1
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Calculate ΔH when 2 moles of ethanol (C2H5OH) reacts with excess oxygen according to the following thermochemical equation?
-2733.4 kJ
-683.35 kJ
-1366.7 kJ
-910.67 kJ
Tags
NGSS.HS-PS1-4
NGSS.HS-PS3-1
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The enthalpy change for the reaction C(s, graphite) + 1⁄2O2(g) --> CO(g) cannot be measured directly since some carbon dioxide is always formed in the reaction. It can be calculated using Hess’s Law and the enthalpy changes of combustion of graphite and of carbon monoxide. C(s, graphite) + O2(g) --> CO2 ΔH=-394 kJmol–1 CO(g) + 1⁄2O2(g) --> CO2 ΔH=-283 kJmol–1 The enthalpy change for the reaction of graphite with oxygen to give carbon monoxide is
-677 kJmol–1
+111 kJmol–1
-111 kJmol–1
+677 kJmol–1
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The enthalpies of combustion of C(s), H2(g) and C4H9OH(l) (in kJmol-1) are as follows
C(s) + O2(g) -> CO2(g) ∆H=a
H2(g) + ½O2(g) -> H2O(l) ∆H=b
C4H9OH(l) + 6O2(g) -> 4CO2(g) + 5H2O(l) ∆H=c
What is the enthalpy change for the reaction shown below?
4C(g) + 5H2(l) + ½O2(g) -> C4H9OH(l)
c – 4a – 5b
2a + 10b - c
4a + 5b - c
2a + 5b + c
Tags
NGSS.HS-PS1-4
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The standard enthalpy changes of combustion of carbon, hydrogen and methane are shown in the table. Which one of the following expressions gives the correct value for the standard enthalpy change of formation of methane in kJ mol–1? C(s) + 2H2(g) → CH4(g)
394 + (2 × 286) – 891
–394 – (2 × 286) + 891
394 + 286 – 891
–394 – 286 + 891
Tags
NGSS.HS-PS1-4
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