Question 1

Burning/deflagration transitions to detonation when

Accepted Answer

A)  pressure reaches 10x atmospheric pressure 
B)  pressure reaches 100x atmospheric pressure 
C)  the reaction front propagation speed exceeds the speed of sound 
D)  the standard container is ruptured and explodes 
E)  none of the above 
A)  pressure reaches 10x atmospheric pressure 
B)  pressure reaches 100x atmospheric pressure 
C)  the reaction front propagation speed exceeds the speed of sound 
D)  the standard container is ruptured and explodes 
E)  none of the above C

Question 2

Given the following reactions: 
A. $\cdot \mathrm { HO } _ { 2 } + \mathrm { H } _ { 2 } \rightarrow \cdot \mathrm { H } + \mathrm { H } _ { 2 } \mathrm { O } _ { 2 }$
B. $\mathrm { HCO } + \cdot \mathrm { H } \rightarrow \mathrm { CH } _ { 2 } \mathrm { O }$
C. $\mathrm { C } _ { 2 } \mathrm { H } _ { 4 } \rightarrow \cdot \mathrm { CH } _ { 3 } \mathrm { CH }$
D. $\mathrm { CH } _ { 4 } + \mathrm { O } _ { 2 } \rightarrow \cdot \mathrm { CH } _ { 3 } + \cdot \mathrm { HO } _ { 2 }$ Which of these are initiation steps?

Accepted Answer

A)  C 
B)  B 
C)  C and D 
D)  A and C 
E)  none of the above 
A)  C 
B)  B 
C)  C and D 
D)  A and C 
E)  none of the above C

Question 3

The lower flammability (explosive limit) is

Accepted Answer

A)  the minimum amount of fuel that can be combusted with 1 mole of oxygen 
B)  the smallest equivalence ratio that will support combustion 
C)  the minimum amount of fuel that can be combusted with 1 mole of air 
D)  the coolest temperature at which one mole of vapor will ignite 
E)  none of the above 
A)  the minimum amount of fuel that can be combusted with 1 mole of oxygen 
B)  the smallest equivalence ratio that will support combustion 
C)  the minimum amount of fuel that can be combusted with 1 mole of air 
D)  the coolest temperature at which one mole of vapor will ignite 
E)  none of the above B

Question 4

A warehouse has an enclosed volume of 500,000L. It is used to store propane cylinders. The LFL/LEL of propane by volume is 2.1%. How many liters of propane would have to leak from cylinders to generate a potentially flammable mixture?

Accepted Answer

A)  238,000 
B)  10,500 
C)  1,050 
D)  23,800 
E)  none of the above 
A)  238,000 
B)  10,500 
C)  1,050 
D)  23,800 
E)  none of the above

Question 5

Given the following data regarding octane:
Heat capacity: 255.6 J/(g °C) for the liquid
Heat capacity
Boiling point: 127°C
Heat of vaporization: 41.4 kJ/mole
AIT: 220°C
Density: 0.70 g/mL
Calculate the heat (Q) required to convert 15.0 mL of octane at the boiling point temperature from liquid to gas. Report the value in kJ

Accepted Answer

A)  2.56 
B)  1.3 
C)  18.2 
D)  3.8 
E)  none of the above 
A)  2.56 
B)  1.3 
C)  18.2 
D)  3.8 
E)  none of the above

Question 6

At what value of the equivalence ratio is the maximum heat produced by a combustion?

Accepted Answer

A)  1 
D)  depends on the fuel 
E)  none of the above 
A)  1 
D)  depends on the fuel 
E)  none of the above

Question 7

What is the process that starts a self-sustaining free radical combustion?

Accepted Answer

A)  ignition 
B)  initiation 
C)  propagation 
D)  deflagration 
E)  none of the above 
A)  ignition 
B)  initiation 
C)  propagation 
D)  deflagration 
E)  none of the above

Question 8

Given the following data, calculate the heat of reaction (combustion) for one gram of butane, C4H10. Report your result in kJ/g.
Standard heats of formation (kJ/mole):
H2O(g): -241.82
CO2(g): -393.5
Butane: -147.6
Formula weight of butane: 58.12 g/mole
L/mole of a gas at STP: 22.4L

Accepted Answer

A)  -45 
B)  18 
C)  -91 
D)  -73 
E)  none of the above 
A)  -45 
B)  18 
C)  -91 
D)  -73 
E)  none of the above

Question 9

When the equivalence ratio of fuel and air in a simple combustion is less than 1.0, this means that

Accepted Answer

A)  the mixture is rich; more fuel than air 
B)  the mixture is lean; less fuel than air 
C)  the mixture is lean; more fuel than air 
D)  the mixture is rich; more air than fuel 
E)  none of the above 
A)  the mixture is rich; more fuel than air 
B)  the mixture is lean; less fuel than air 
C)  the mixture is lean; more fuel than air 
D)  the mixture is rich; more air than fuel 
E)  none of the above

Question 10

Given the following data, calculate how many liters of gas are produced in the combustion of one mole of butane, C4H10. Report your result in L/mole and assume STP.
Standard heats of formation (kJ/mole):
H2O(g): -241.82
CO2(g): -393.5
Butane: -147.6
Formula weight of butane: 58.12 g/mole
L/mole of a gas at STP: 22.4L

Accepted Answer

A)  405 
B)  202 
C)  100 
D)  9 
E)  none of the above 
A)  405 
B)  202 
C)  100 
D)  9 
E)  none of the above

Question 11

What are the components of the fire triangle?

Accepted Answer

A)  fuel, heat, free radicals 
B)  light, heat, free radicals 
C)  oxygen, reducing agent, light 
D)  fuel, oxygen, heat 
E)  none of the above 
A)  fuel, heat, free radicals 
B)  light, heat, free radicals 
C)  oxygen, reducing agent, light 
D)  fuel, oxygen, heat 
E)  none of the above

Question 12

When a hot expanding gas in an internal combustion engine causes a piston to move, this is an example of

Accepted Answer

A)  TΔS work 
B)  PΔV work 
C)  Heat work 
D)  Kinetic work 
E)  none of the above 
A)  TΔS work 
B)  PΔV work 
C)  Heat work 
D)  Kinetic work 
E)  none of the above

Question 13

Fundamentally, what drives mass transfer of oxygen and fuel in simple combustion?

Accepted Answer

A)  concentration gradients 
B)  potential energy 
C)  heating of the products 
D)  heating of the reactants 
E)  none of the above 
A)  concentration gradients 
B)  potential energy 
C)  heating of the products 
D)  heating of the reactants 
E)  none of the above

Question 14

Given the following reactions:
A. $\cdot \mathrm { HO } _ { 2 } + \mathrm { H } _ { 2 } \rightarrow \cdot \mathrm { H } + \mathrm { H } _ { 2 } \mathrm { O } _ { 2 }$
B.  $\mathrm { HCO } + \cdot \mathrm { H } \rightarrow \mathrm { CH } _ { 2 } \mathrm { O }$
C. $\mathrm { C } _ { 2 } \mathrm { H } _ { 4 } \rightarrow \cdot \mathrm { CH } _ { 3 } \mathrm { CH }$
D. $\mathrm { CH } _ { 4 } + \mathrm { O } _ { 2 } \rightarrow \cdot \mathrm { CH } _ { 3 } + \cdot \mathrm { HO } _ { 2 }$ Which of these are propagation steps?

Accepted Answer

A)  A 
B)  B 
C)  C and D 
D)  A and B 
E)  none of the above 
A)  A 
B)  B 
C)  C and D 
D)  A and B 
E)  none of the above

Question 15

The temperature at which a flammable mixture can ignite spontaneously is the

Accepted Answer

A)  flashpoint 
B)  lower flammability limit 
C)  autoignition temperature 
D)  deflagration point 
E)  none of the above 
A)  flashpoint 
B)  lower flammability limit 
C)  autoignition temperature 
D)  deflagration point 
E)  none of the above

Question 16

The relative power of combustibles to do PV work can be estimated by comparing what values?

Accepted Answer

A)  TΔS 
B)  QV 
C)  Heats of formation 
D)  Heat capacities 
E)  none of the above 
A)  TΔS 
B)  QV 
C)  Heats of formation 
D)  Heat capacities 
E)  none of the above

Question 17

When a simple combustion equation is balanced, the resulting amounts of the products are reactants are at

Accepted Answer

A)  Equilibrium 
B)  Lean conditions 
C)  Stoichiometric equivalence 
D)  Rich conditions 
E)  none of the above 
A)  Equilibrium 
B)  Lean conditions 
C)  Stoichiometric equivalence 
D)  Rich conditions 
E)  none of the above

Question 18

What is the lowest temperature form of combustion?

Accepted Answer

A)  flame 
B)  smoldering 
C)  deflagration 
D)  detonation 
E)  none of the above 
A)  flame 
B)  smoldering 
C)  deflagration 
D)  detonation 
E)  none of the above

Question 19

Given the following data, calculate the heat of reaction (combustion) for one mole of butane, C4H10. Report your result in kJ/mol.
Standard heats of formation (kJ/mol):
H2O(g): -241.82
CO2(g): -393.5
Butane: -147.6
Formula weight of butane: 58.12 g/mol
L/mole of a gas at STP: 22.4L

Accepted Answer

A)  -5272 
B)  1831 
C)  -2636 
D)  -1831 
E)  none of the above 
A)  -5272 
B)  1831 
C)  -2636 
D)  -1831 
E)  none of the above

Question 20

The lowest temperature at which a flammable liquid will sufficiently vaporize to produce a potentially flammable mixture is the

Accepted Answer

A)  flashpoint 
B)  autoignition temperature 
C)  initiation temperature 
D)  deflagration temperature 
E)  none of the above 
A)  flashpoint 
B)  autoignition temperature 
C)  initiation temperature 
D)  deflagration temperature 
E)  none of the above

Burning/deflagration transitions to detonation when

The lower flammability (explosive limit) is

A warehouse has an enclosed volume of 500,000L. It is used to store propane cylinders. The LFL/LEL of propane by volume is 2.1%. How many liters of propane would have to leak from cylinders to generate a potentially flammable mixture?

At what value of the equivalence ratio is the maximum heat produced by a combustion?

What is the process that starts a self-sustaining free radical combustion?

Given the following data, calculate the heat of reaction (combustion) for one gram of butane, C₄H₁₀. Report your result in kJ/g. Standard heats of formation (kJ/mole): H₂O(g): -241.82 CO₂(g): -393.5 Butane: -147.6 Formula weight of butane: 58.12 g/mole L/mole of a gas at STP: 22.4L

When the equivalence ratio of fuel and air in a simple combustion is less than 1.0, this means that

What are the components of the fire triangle?

When a hot expanding gas in an internal combustion engine causes a piston to move, this is an example of

Fundamentally, what drives mass transfer of oxygen and fuel in simple combustion?

The temperature at which a flammable mixture can ignite spontaneously is the

The relative power of combustibles to do PV work can be estimated by comparing what values?

When a simple combustion equation is balanced, the resulting amounts of the products are reactants are at

What is the lowest temperature form of combustion?

Given the following data, calculate the heat of reaction (combustion) for one mole of butane, C₄H₁₀. Report your result in kJ/mol. Standard heats of formation (kJ/mol): H₂O(g): -241.82 CO₂(g): -393.5 Butane: -147.6 Formula weight of butane: 58.12 g/mol L/mole of a gas at STP: 22.4L

The lowest temperature at which a flammable liquid will sufficiently vaporize to produce a potentially flammable mixture is the

Making Good Measurements

Assuring Good Measurements

Chemical Fundamentals

Chromatography and Mass Spectrometry

Spectroscopy

Overview of Drug Analysis

Novel Psychoactive Substances

Fundamentals of Toxicology

Applications of Forensic Toxicology

Fire Investigation and Fire Debris Analysis

Explosives

Firearms and Firearms Discharge Residue

Forensic Chemistry and Trace Evidence Analysis

Filters

Exam 10: Overview of Combustion Chemistry

Burning/deflagration transitions to detonation when

The lower flammability (explosive limit) is

A warehouse has an enclosed volume of 500,000L. It is used to store propane cylinders. The LFL/LEL of propane by volume is 2.1%. How many liters of propane would have to leak from cylinders to generate a potentially flammable mixture?

At what value of the equivalence ratio is the maximum heat produced by a combustion?

What is the process that starts a self-sustaining free radical combustion?

Given the following data, calculate the heat of reaction (combustion) for one gram of butane, C4H10. Report your result in kJ/g. Standard heats of formation (kJ/mole): H2O(g): -241.82 CO2(g): -393.5 Butane: -147.6 Formula weight of butane: 58.12 g/mole L/mole of a gas at STP: 22.4L

When the equivalence ratio of fuel and air in a simple combustion is less than 1.0, this means that

What are the components of the fire triangle?

When a hot expanding gas in an internal combustion engine causes a piston to move, this is an example of

Fundamentally, what drives mass transfer of oxygen and fuel in simple combustion?

The temperature at which a flammable mixture can ignite spontaneously is the

The relative power of combustibles to do PV work can be estimated by comparing what values?

When a simple combustion equation is balanced, the resulting amounts of the products are reactants are at

What is the lowest temperature form of combustion?

Given the following data, calculate the heat of reaction (combustion) for one mole of butane, C4H10. Report your result in kJ/mol. Standard heats of formation (kJ/mol): H2O(g): -241.82 CO2(g): -393.5 Butane: -147.6 Formula weight of butane: 58.12 g/mol L/mole of a gas at STP: 22.4L

The lowest temperature at which a flammable liquid will sufficiently vaporize to produce a potentially flammable mixture is the

Making Good Measurements

Assuring Good Measurements

Chemical Fundamentals

Chromatography and Mass Spectrometry

Spectroscopy

Overview of Drug Analysis

Novel Psychoactive Substances

Fundamentals of Toxicology

Applications of Forensic Toxicology

Fire Investigation and Fire Debris Analysis

Explosives

Firearms and Firearms Discharge Residue

Forensic Chemistry and Trace Evidence Analysis

Filters

Given the following data, calculate the heat of reaction (combustion) for one gram of butane, C₄H₁₀. Report your result in kJ/g. Standard heats of formation (kJ/mole): H₂O(g): -241.82 CO₂(g): -393.5 Butane: -147.6 Formula weight of butane: 58.12 g/mole L/mole of a gas at STP: 22.4L

Given the following data, calculate the heat of reaction (combustion) for one mole of butane, C₄H₁₀. Report your result in kJ/mol. Standard heats of formation (kJ/mol): H₂O(g): -241.82 CO₂(g): -393.5 Butane: -147.6 Formula weight of butane: 58.12 g/mol L/mole of a gas at STP: 22.4L