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CHM 1025 Final Exam 2024/2025 Questions With Completed & Verified Solutions.
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CHM 1025 Final Exam 2024/2025 Questions With Completed & Verified Solutions.
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CHM 1025 Final ExamWhich of the following setups would convert centimeters to feet? (2.54 cm=1 inch) - ANS 1
centimeter X 1 inch/2.54 centimeters X 1 foot/12 inches
How would you classify raisin bran? - ANS 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 - ANS 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 - ANS 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. - ANS 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 - ANS 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 - ANS 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. - ANS 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. - ANS 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 - ANS ii, iii
When the following equation is balanced, the coefficient of Al2O3 is _____.
Al2O3 (s) + C (s) + Cl2 (g) → AlCl3 (s) + CO (g) - ANS 1
How many equivalent resonance forms can be drawn for CO32-(carbon is the central atom)? -
ANS 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 - ANS i) trigonal pyramidal
ii) tetrahedral
iii) tetrahedral
iv) linear
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