CHM 1025 Final Exam Questions And Answers Already Graded A+
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Course
CHM 1025
Institution
CHM 1025
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
...
CHM 1025 Final Exam
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
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. (70.906 /
159.08) X100]
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
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]
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
iii) tetrahedral
iv) linear
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