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Exam 2
N/A
35
Chemistry
Undergraduate 1
03/22/2009

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Cards

Term
Infrared light interacts with matter to cause
Definition
increased vibration
Term
The band of the electromagnetic spectrum central to the greenhouse effect is...
Definition
infrared light
Term
The greenhouse effect is caused by gases that
Definition
absorb infrared radiation
Term
The atmosphere is almost transparent to which band of electromagnetic spectrum
Definition
visible
Term
Which substance is not a greenhouse gas?
Definition
nitrogen
Term
Predict the geometry at the carbon atoms in acetylene (c2h2)
Definition
linear
Term
Predict the geometry at the carbon in formimine (CH3N)
Definition
trigonal planar
Term
Predict the geometry at the nitrogen in formimine (CH3N)
Definition
bent
Term
Chemists use a very large number to designate a "standard" pile of atoms or molecules. This number is called....
Definition
Avogrados number
Term
Find the molar mass of ethanol, C2H6O
Definition
46.07 g/mol
Term
What is the coefficent for oxygen in the balanced chemical equation for the combustion of heptane? (C7H16)
Definition
11
Term
How many moles of water molecules are contained in 144g of water?
Definition
8.0 moles
Term
How many mole of hydrogen atoms are contained in 144g of water
Definition
16.0 moles
Term
How much oxygen is contained in 100g of water?
Definition
88.9 g
Term
Scientists believe deforestation leads to global warming because...
Definition
trees are net consumers of carbon dioxide
Term
Infared light has a shorter wavelength than...
Definition
microwaves
Term
Which of the following properties of hydrogen does not describe one of its advantages as a fuel?
Definition
a low energy to volume ratio
Term
A truly inexhaustible supply of energy will be available to us when we…
Definition
learn how to convert light energy into chemical energy efficiently
Term
A battery converts chemical energy into....
Definition
electrical energy
Term
Which substance is likely to have the highest boiling point?
Definition
C18H38
Term
The electron transfer process in batteries can convert chemical energy to electrical energy with efficiencies approaching..
Definition
90%
Term
In lecture we discussed the use of ethanol as a fuel. How much energy is "lost" in the transformation from sugar to ethanol
Definition
60 kJ/mole sugar
Term
Consider the reaction shown below: CH4+ 2O2 -> CO2 + 2H2O Which of the following statements might be made most readily about this reaction.
Definition
Its exothermic (releases energy)
Term
Which one of the following groups of fuel sources include only fossil fuels?
Definition
oil, natural gas, hydropower
Term
The components of crude oil are separated on the basis of what physical property
Definition
Boiling point
Term
The process of electron transfer involves…
Definition
the movement of electrons from a locus of high potential energy to a locus of low potential energy.
Term
e conversion of heat energy into mechanical energy is inherently inefficient because…
Definition
of the random nature of heat energy.
Term
A compelling argument for the use of renewable plant derived fuels such as ethanol and biodiesel would likely include what fact
Definition
The carbon contained in them is taken from the atmosphere.
Term
From an environmental perspective, the use of fossil fuels as an energy source is undesirable because..
Definition
they all release long sequestered carbon into the atmosphere as carbon dioxide.
Term
At present, the recoverable supply of coal is approximately...
Definition
20-40 times greater than oil reserves.
Term
From what element are PV (photovoltaic) cells predominantly made?
Definition
silicon
Term
Which description best describes the process of recharging a battery?
Definition
the conversion of electrical energy into chemical energy
Term
Which element is used as an n type dopant in PV silicon crystals?
Definition
antimony (Sb)
Term
P- Type (in PV [ photovoltaic cells ])
Definition
1 less electron relative to silicon
Term
N-type in PV [ photovoltaic cells ])
Definition
1 more electron relative to silicon
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