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CHM 1025 Final Exam/81 Questions with Verified Answers
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CHM 1025 Final Exam/81 Questionswith Verified Answers
Which of the following setups would convert centimeters to feet? (2.54 cm=1
inch) - -1 centimeter X 1 inch/2.54 centimeters X 1 foot/12 inches
-How would you classify raisin bran? - -Mixed-heterogeneous
-Which atom has the largest number of neutrons?
a) phosphorus-30
b) chlorine-37
c) potassium-39
d) argon-40
e) calcium-40 - -d) argon-40 [40-18=22 neutrons]
-Select the false statements from the following
i) Elements are arranged by increasing atomic mass in the modern periodic
table
ii) Nonmetals are found on the left hand side of the periodic table
iii) Group 2A elements are called alkali metals
iv) Germanium would be expected to be a semiconductor
v) Iodine is a metal - -ii, iii,v
(Nonmetals are found on the right hand side of the periodic table, Group 2A
are alkaline earth metals, iodine is a halogen)
-Describe the trend of atomic size. - -Increases in going from top to bottom
within a group because the valence electrons are further away from the
nucleus and decreases from left to right across a period because the nuclear
charge increases.
-Name each of the following:
i) MgF2
ii) BaO
iii) Na2O
iv) CaSe
v) CoCl2 - -i) magnesium fluoride
ii) barium oxide
iii) sodium oxide
iv) calcium selenide
v) cobalt(ii) chloride
[ionic compounds don't need prefix]
-Enter the number of atoms in the empirical number for the compound
formed from the following metal/ nonmetal combinations:
, i) magnesium and oxygen
ii) aluminum and oxygen
iii) strontium and bromine
iv) Au^3+ and iodine
v) Co^3+ and sulfure - -i) 2
ii) 5
iii) 3
iv) 4
v) 5
-Sulfur trioxide can react with atmospheric water vapor to form sulfuric acid
that falls as acid rain. The mass of 3.65 × 1020 molecules of SO3 is ____ g.
Enter a numerical answer, without units, in the blank space provided.
Express your answer to three significant figures. - -0.049g
[3.65X10^20 molecules of SO3 X 1 mol SO3/ 6.022X10^23 molecules SO3 X
80.066 g SO3/ 1 mol SO3]
-The formula for mustard gas used in chemical warfare is C4H8SCl2. What is
the percentage of chlorine in the compound? Enter a number in the blank
provided, without units. Express your answer to three significant figures. - -
44.6%
[molar mass of C4H8SCl2 is 159.08. mass of chlorine in C4H8SCl2 is 70.906.
(70..08) X100]
-Which changes are chemical reactions? Select all that apply.
i) ice melting upon warming
ii) an electric current passing through water, resulting in the formation of
hydrogen and oxygen gas that appear as bubbles
iii) iron rusting
iv) bubbles forming when a soda can is opened - -ii, iii
-When the following equation is balanced, the coefficient of Al2O3 is _____.
Al2O3 (s) + C (s) + Cl2 (g) → AlCl3 (s) + CO (g) - -1
-How many equivalent resonance forms can be drawn for CO32-(carbon is
the central atom)? - -3
[any of the three oxygens can be double bonded]
-Indicate the molecular geometry around the central atom of each of the
following species:
i) NCl3 trigonal
ii) SiF4
iii) the underlined atom in CH3OCH3
iv) the underlined carbon in CH3CN
v) BCl3 - -i) trigonal pyramidal
ii) tetrahedral
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