Hess' Law

Hess' Law

10th - 12th Grade

6 Qs

quiz-placeholder

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Hess' Law

Hess' Law

Assessment

Quiz

Chemistry

10th - 12th Grade

Medium

NGSS
HS-PS1-4, HS-PS3-1

Standards-aligned

Created by

Allyson Watson

Used 67+ times

FREE Resource

6 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

The enthalpies of combustion of C(s), H2(g) and C4H9OH(l) (in kJmol-1) are as follows  
C(s) + O
2(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

2.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

The enthalpy change for the reaction
C(s, graphite) + 1⁄2O
2(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 

Tags

NGSS.HS-PS1-4

3.

MULTIPLE CHOICE QUESTION

30 sec • 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

4.

MULTIPLE CHOICE QUESTION

30 sec • 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

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Consider the following equations.


Mg(s) + O2(g) → MgO(s)H = –602 kJ

H2(g) + O2(g) → H2O(g)H = –242 kJ


What is the ∆H value (in kJ) for the following reaction?


MgO(s) + H2(g) → Mg(s) + H2O(g)

-844

-360

+360

+844

Tags

NGSS.HS-PS1-4

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The standard enthalpy change of formation values of two oxides of phosphorus are:


P4(s) + 3O2(g) → P4O6(s) ΔHf = –1600 kJ mol–1

P4(s) + 5O2(g) → P4O10(s) ΔHf = –3000 kJ mol–1


What is the enthalpy change, in kJ mol–1, for the reaction below?


P4O6(s) + 2O2(g) → P4O10(s)

+4600

+1400

–1400

–4600

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1