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intro to comb.

INSTRUCTIONS: Please answer ALL 30 questions, showing workings, calculations and drawings where appropriate.

In solving exercises, use and indicate proper units for dimensional parameters; do not use numerical values with extra digital places.
Please provide a list of used references (books, journal papers, conference proceedings, private communications etc).
Your answers have to be completed as a hard copy in word-processed form and an electronic copy should also be submitted using eLearn and Turnitin.

What are the different states of matter and what is the molecular difference between them? (4 Marks)

What are free radicals? What is their relevance to fires? (2 Marks)

Convert the following temperatures into Kelvin:
146.5°C
374°F
765°C
112°F
(4 Marks)

Balance the following equations:
Fe + H2SO4 =>Fe3(SO4)3 + H2
SnO2 + H2 => Sn + H2O
(NH4)3PO4 + Pb(NO3)4 => Pb3(PO4)4 + NH4NO3
SeCl6 + O2 + C => SeO2 + Cl2
(8 Marks)

The upward movement of flames and gases can be affected and altered by a number of factors. What are the most common? (2 Marks)

How many joules of heat are needed to raise the temperature of 2kg of gypsum plaster from 60°C to 280°C? (2 Marks)

Why would a mixture of gases react faster when the volume they occupy is decreased? (1 Mark)

What is the difference between temperature and heat? (1 Mark)

The empirical formula for benzene is CH. Its molecular weight was determined to be 78 g/mol. What is the molecular formula? (2 Marks)

Calculate the rate of heat transfer through a 0.64 square meter of a plaster wall 3.2 cm thick. One side of the wall is at 275°C, while other side is at 32°C. Thermal conductivity of gypsum plaster is 0.48 W/mK. (4 Marks)

What are the different types of fire extinguisher and on what can they be used? (6 Marks)

What are the differences between a premixed and a diffusion flame? What are the temperature profiles of each type of flame? (6 Marks)

What kinds of materials can undergo smouldering combustion? (2 Marks)

What is the basic mechanism of fire spread? (4 Marks)

Why is turbulence important in combustion? (2 Marks)

Give three reasons why the thermal radiation from a flame is of importance in fire safety? (3 Marks)

What is a detonation? How is this different from a deflagration? (4 Marks)

Explain the terms: Boyles Law, the Combined Gas Law and the Ideal Gas Law. Include equations. Using the Ideal Gas Law solve the following problems:
If there are 4 moles of a gas at a pressure of 5.6 atm and a volume of 12 litres, what is the temperature?
If there is an unknown quantity of gas at a pressure of 1.2 atm, a volume of 31 litres, and a temperature of 87 0C, how many moles of gas do I have?
(8 Marks)

What factors affect oxygen depletion rates during a fire in a compartment? (3 Marks)

Identify the sequence of occurrence of fire hazards, to the occupants within a compartment fire. Explain the terms ASET and RSET. (6 Marks)

Draw and label a diagram showing the standard fire curve. (6 Marks)

How does the presence of moisture in air affect the outcome of a combustion process? (1 Mark)

Is the number of atoms of each element conserved during a chemical reaction? How about the total number of moles? (2 Marks)

What is the air–fuel ratio? How is it related to the fuel–air ratio? (2 marks)

Is the air–fuel ratio expressed on a mole basis identical to the air–fuel ratio expressed on a mass basis? (2 Marks)

What are the causes of incomplete combustion? (2 Marks)

Which is more likely to be found in the products of an incomplete combustion of a hydrocarbon fuel, CO or OH? Why? (2 Marks)

What does 100 percent theoretical air represent? (2 Marks)

What is enthalpy of combustion? How does it differ from the enthalpy of reaction? What is enthalpy of formation? How does it differ from the enthalpy of combustion? Define the term “Heat of Combustion?” (4 Marks)

Discuss the 4 categories of flames. Giving examples of each (8 Marks)

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