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CHM 1020 Final Exam
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Exam of 17 pages for the course Biology 101 at Biology 101 (CHM 1020 Final Exam)
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CHM 1020 Final ExamOxidation and reduction of atoms involves a change in the number of ________ in the
atom. - ANS-Electrons
Which squares contain mixtures? - ANS-III (two white's together and 3 darks separated)
and IV (4 strands all together, 2 with whites and darks, 2 with just whites) only
Which corresponds to the composition of the ion typically formed by magnesium?
#protons #electrons net charge
A. 12 14 2+
B. 12 14 2-
C. 12 14 2-
D. 12 10 2+ - ANS-D
Which substance is an element? - ANS-N2
What distinguishes the atoms of one element from another? - ANS-The number of
protons
Which country is the world's leading producer of rare earth elements? - ANS-China
What type of material is defined as having a well-ordered atomic structure? -
ANS-Crystalline
One of the lightest smartphones on the market today weighs 113 g. To protect your
phone, you may want to use a screen protector, which weighs 27.2 g, and a heavy duty
phone case, which weighs 114 g. What is the total weight of the phone, screen
protector, and case? - ANS-254g
Which one of these materials is most likely to conduct heat? - ANS-A titanium rod
What are the three pillars of sustainability? - ANS-Environmental, social, economic
Which symbol(s) represent(s) elements in the noble gas family? - ANS-Q (Noble gases
are in the far right column of the periodic table)
,What term is defined as the flow of electrons from one location to another? -
ANS-Electricity
Green chemistry is - ANS-the design of products and processes that reduce hazardous
substances
The burning of coal produces sulfur dioxide, SO2, a pollutant that slowly reacts in air to
form SO3. Sulfur trioxide dissolves into airborne water droplets to form a very corrosive
solution of sulfuric acid. Which is a product of burning coal that hastens the
transformation of sulfur dioxide into sulfur trioxide? - ANS-Particles of ash
Which is the balanced chemical equation for the reaction of nitrogen (N2) with oxygen
(O2) to form NO? - ANS-N2 + O2 → 2 NO
Choose the proper coefficients for each substance to balance this equation. - ANS-1, 3,
2, 2
Currently, the primary source of sulfur dioxide emissions into the atmosphere is -
ANS-coal burning power plants
Which is the correct balanced equation for the complete combustion of ethane in excess
oxygen? - ANS-2C2H6 + 7 O2 → 4 CO2 + 6 H2O
Which of the following would be described as "fine particles?" - ANS-2.5 μm diameter
soot
What is the greatest source of indoor air pollution in developing countries? -
ANS-Cookstoves
Balance this equation P4 + Cl2 → PCl5 with the smallest whole number coefficients.
Choose the answer that is the sum of the coefficients. (Do not forget coefficients of
"one.") - ANS-15
A particular sample of air is 2.5 percent water vapor. Express the concentration of water
vapor in parts per million (ppm). - ANS-0.025 ppm
Which component of the air is an element? - ANS-O2
Which is the balanced chemical equation showing hydrogen peroxide (H2O2)
decomposing into hydrogen (H2) and oxygen (O2)? - ANS-H2O2 → H2 + O2
, Which shows the balanced equation for the reaction of nitrogen (dark dot), as it is
normally found in our atmosphere, with oxygen (white dot), as it is normally found in our
atmosphere, to form nitrogen dioxide? - ANS-D (2 nitrogen + 2 oxygen + 2 oxygen → 1
nitrogen between 2 oxygen + 1 nitrogen between 2 oxygen)
Which is one of the Lewis structures for ozone? - ANS-B (The total number of electrons
that must be used is 18 while each atom needs an octet around it)
In Earth's atmosphere, where is the ozone layer? - ANS-Stratosphere
The two chemical bonds and geometry of water are best represented by - ANS-A.
Pyramidal shape with a dark dot on top and two white dots stemming from it. (What has
two equal bonds and has two lone pairs of electrons on the central oxygen)
The speed of light in air - ANS-is independent of the wavelength and frequency of light
Ozone in our atmosphere is important because it - ANS-absorbs some UV radiation
Light behaves like - ANS-both a particle and a wave
Which of the following compounds is useful for putting out fires and does not deplete
stratospheric ozone concentrations? - ANS-Halon-1211
Single bonds, double bonds, and triple bonds - ANS-have 2, 4 and 6 shared electrons,
respectively
Which of the following is most biologically damaging type of radiation? - ANS-UV-C
Halons differ from CFCs in that the atoms of ________ replace some ________ atoms.
- ANS-bromine; chlorine
The Montreal protocol is a - ANS-treaty to reduce the amount of CFCs produced in the
world
Which region of the ultraviolet spectrum is absorbed least by the atmosphere? -
ANS-UV-A
Which occurrences or processes are expected to reduce the level of atmospheric
carbon?
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