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CHM 1020 Final Exam With Verified Answers
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CHM 1020 Final Exam With VerifiedAnswers
Oxidation and reduction of atoms involves a change in the number of ________ in
the atom. CORRECT ANSWERS Electrons
Which squares contain mixtures? CORRECT ANSWERS 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+ CORRECT ANSWERS D
Which substance is an element? CORRECT ANSWERS N2
What distinguishes the atoms of one element from another? CORRECT
ANSWERS The number of protons
Which country is the world's leading producer of rare earth elements? CORRECT
ANSWERS China
What type of material is defined as having a well-ordered atomic structure?
CORRECT ANSWERS 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? CORRECT ANSWERS 254g
,Which one of these materials is most likely to conduct heat? CORRECT
ANSWERS A titanium rod
What are the three pillars of sustainability? CORRECT ANSWERS
Environmental, social, economic
Which symbol(s) represent(s) elements in the noble gas family? CORRECT
ANSWERS 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?
CORRECT ANSWERS Electricity
Green chemistry is CORRECT ANSWERS 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? CORRECT
ANSWERS Particles of ash
Which is the balanced chemical equation for the reaction of nitrogen (N2) with
oxygen (O2) to form NO? CORRECT ANSWERS N2 + O2 → 2 NO
Choose the proper coefficients for each substance to balance this equation.
CORRECT ANSWERS 1, 3, 2, 2
Currently, the primary source of sulfur dioxide emissions into the atmosphere is
CORRECT ANSWERS coal burning power plants
Which is the correct balanced equation for the complete combustion of ethane in
excess oxygen? CORRECT ANSWERS 2C2H6 + 7 O2 → 4 CO2 + 6 H2O
Which of the following would be described as "fine particles?" CORRECT
ANSWERS 2.5 μm diameter soot
, What is the greatest source of indoor air pollution in developing countries?
CORRECT ANSWERS 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.") CORRECT ANSWERS 15
A particular sample of air is 2.5 percent water vapor. Express the concentration of
water vapor in parts per million (ppm). CORRECT ANSWERS 0.025 ppm
Which component of the air is an element? CORRECT ANSWERS O2
Which is the balanced chemical equation showing hydrogen peroxide (H2O2)
decomposing into hydrogen (H2) and oxygen (O2)? CORRECT ANSWERS 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? CORRECT ANSWERS 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? CORRECT ANSWERS 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? CORRECT ANSWERS
Stratosphere
The two chemical bonds and geometry of water are best represented by CORRECT
ANSWERS 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)
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