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PCC 274 Chapter 17 Questions with complete answers(verified for accuracy).
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PCC 274 Chapter 17 Questions with complete answers(verified for accuracy).
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PCC 274: Chapter 17 Questionswith complete answers(verified
for accuracy)
True or False: The absence of chemical residues always rules out the
possibility of arson - answer false
The combination of oxygen with other substances to produce new
chemical products is called ____________ - answer oxidation
True or False: All oxidation reactions produce noticeable quantities
of heat and light - answer false
___________ is the capacity for doing work - answer energy
Burning methane for the purpose of heating water to produce steam
in order to drive a turbine is an example of converting __________
energy to _______________ energy - answer chemical; mechanical
The quantity of heat evolved from a chemical reaction arises out of
the _________ and __________ of chemical bonds - answer breaking;
formation
Molecules must (absorb, liberate) energy to break their bonds and
(absorb, liberate) energy when their bonds are re-formed - answer
absorb; liberate
All oxidation reactions (absorb, liberate) heat - answer liberate
, Reactions that liberate heat are said to be _________ - answer
exothermic
Excess heat energy liberated by an oxidation reaction is called the
_____________ - answer heat of combustion
A chemical reaction in which heat is absorbed from the surroundings
is said to be ___________ - answer endothermic
True or False: All reactions require an energy input to start them -
answer true
The minimum temperature at which a fuel burns is known as the
___________ temperature - answer ignition
A fuel achieves a sufficient reaction rate with oxygen to produce a
flame only in the (gaseous, liquid) state - answer gaseous
The lowest temperature at which a liquid fuel produces enough
vapor to burn is the ____________ - answer flash point
___________ is the chemical breakdown of a solid material to gaseous
products - answer pyrolysis
_____________ is a phenomenon in which a fuel burns without the
presence of a flame - answer glowing combustion/smoldering
The rate of a chemical reaction (increases, decreases) as the
temperature rises - answer increases
___________ describes a fire caused by a natural heat-producing
process - answer spontaneous combustion
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