
Inv 8 Exp 2 - Heat of Formation & Hess Law
Authored by E Hernandez
Chemistry
10th - 12th Grade
NGSS covered
Used 15+ times

AI Actions
Add similar questions
Adjust reading levels
Convert to real-world scenario
Translate activity
More...
Content View
Student View
9 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Elements in their standard state always have standard enthalpies of ________.
-396 kJ/mol
33.2 kJ/mol
0.0 kJ/mol
396 kJ/mol
Tags
NGSS.HS-PS1-4
2.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
From the following data,
H2 (g) + Cl2 (g) →2HCl(g) ΔH°v = -185 kJ,
2H2 (g) + O2 (g) →2H2O(g) ΔH° = -483.7 kJ,
calculate ΔH° for the following reaction.
4HCl(g) + O2 (g) →2Cl2 (g) + 2H2O(g)
299 kJ
-114 kJ
-299 kJ
114 kJ
Tags
NGSS.HS-PS1-4
3.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
The enthalpies of combustion of C(s), H2(g) and C4H9OH(l) (in kJ/mol) 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
NGSS.HS-PS3-1
NGSS.HS-PS1-2
4.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Calculate the enthalpy of reaction (ΔH).
4CO2 (g) + 6H2O (g) → 2C2H6 (g) + 7O2 (g)
ΔHfo [CO2(g)] = -393.5 kJ
ΔHfo [H2O(g)] = -241.8 kJ
ΔHfo [C2H6(g)] = -84.7 kJ
550.6 kJ/mol
2855.4 kJ/mol
-550.6 kJ/mol
-3194.2 kJ/mol
Tags
NGSS.HS-PS1-4
NGSS.HS-PS3-1
5.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
What is the difference between calculating with bond energies versus with heats of formation?
Bond energies are averages based on multiple scenarios of breaking bonds, heats of formation is the energy required to form a specific molecule from its elemental forms.
Heats of formation are averages based on multiple scenarios of breaking bonds, bond energies is the energy required to form a specific molecule from its elemental forms.
Bond energies are calculated using only lewis dot structures, but heats of formation requires a reference table
Heats of formation helps calculate enthalpy, while bond energies helps calculate entropy
6.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
The standard state of elements when using heat of formations is (select all that apply):
The state of the elements (solid, liquid, gas) at standard temperature and pressure.
Diatomic gas molecules for H2, N2, O2, F2 and Cl2
Always a monoatomic gas with no net charge.
A gas at its boiling point.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
which of the following enthalpy changes represent the enthalpy change of formation?
Mg(s) + Cl2(g) → MgCl2(s)
Mg2+(g) + 2 Cl -(g) → MgCl2(aq)
O2(g) → 2 O(g)
2Mg (s) + O2(g) → 2MgO(S)
Access all questions and much more by creating a free account
Create resources
Host any resource
Get auto-graded reports

Continue with Google

Continue with Email

Continue with Microsoft
or continue with
%20(1).png)
Apple
Others
Already have an account?