CEM 141 MSU Final Exam Latest Update 2025-

CEM 141 MSU Final Exam Latest Update 2025- 2026 85 Questions and 100% Verified Correct Answers Guaranteed A+

1s2,2s2,2p6,3s1 - CORRECT ANSWER: What is the electron configuration of Mg+?

• 1s2,2s2,2p6,3s2
• 1s2,2s2,2p6,3s1
• 1s2,2s2,2p6
• 1s2,2s2,2p5
• 1s2,2s2,2p6,3s2,3p3
• 1s2,2s2,2p6,3s2,3p4

1x10^4 m - CORRECT ANSWER: An MRI machine operates at a frequency of 30

kilohertz (kHz), what wavelength radiation does this correspond to?

• 1x10^10 m
• 1x10^7 m
• 1x10^5 m
• 1x10^4 m

• lone pair - CORRECT ANSWER: Draw the Lewis structure for sulfur dichloride, SCl2.

How many lone pair of electrons are on the sulfur atom?

• 0 lone pair
• 1 lone pair
• 2 lone pairs
• 3 lone pairs
• 4 lone pairs
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3.011x10^24 H atoms - CORRECT ANSWER: How many hydrogen atoms are there in

one mole of CH2Cl2?

46 core and 7 valence - CORRECT ANSWER: How many core and valence electrons

does one atom of Iodine (I) have?

• 36 core and 17 valence
• 7 core and 36 valence
• 36 core and 7 valence
• 46 core and 7 valence

• - CORRECT ANSWER: Ammonia reacts with oxygen to produce nitric oxide in water.

Balance the equation using small, whole number coefficients:

______ NH3 + ______ O2 --> ______ NO + ______ H2O

What is the coefficient for oxygen (O2)?

84% - CORRECT ANSWER: Hydrogen reacts with oxygen to produce water according

to the following equation:

• H2 + O2 --> 2 H2O

You start a reaction with 53 grams of H2 and excess O2 and you end up producing 400 grams of H2O. What is the percent yield of this reaction?

All atoms are indivisible and indestructable - CORRECT ANSWER: Thomson's cathode ray tube experiment proved FALSE what part of Dalton's atomic theory?

• All atoms are indivisible and indestructible
• All atoms of a given element are identical
• All matter is made of atoms.
• Compounds are formed from the combination of two or more elements. 2 / 3

• Chemical reactions are rearranging of atoms

All of the above - CORRECT ANSWER: Which of the following contain(s) atoms?

• Heat
• Light
• Energy
• Dust
• All of the above

Atoms are mostly empty space Atoms are in constant motion - CORRECT ANSWER: Which of the following properties ascribed to atoms by the Greeks do we still consider valid?

• Atoms are mostly empty space

II. The size and shape of the atoms determine a material's properties III. Atoms are indivisible IV. Atoms are in constant motion

Because the repulsive force between the overlapping electron clouds is dominant -

CORRECT ANSWER: Why does the potential energy increase as two xenon atoms

move extremely close together?

• Because the kinetic energy decreases as the atoms slow down.
• Because the electrostatic attractive force from the instantaneous dipoles is dominant.
• Because the repulsive force between the overlapping electron clouds is dominant.
• Because there is more potential energy than kinetic energy when the atoms are close

together.

Cl- is larger because fewer protons are attracting the same number of electrons as in

K+ - CORRECT ANSWER: Consider K+ and Cl-. Which do you predict is larger and

why?

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