Answers26-27 WHS-Chemistry-1stSixWeeksThe History and Arrangement of the Periodic Table

The History and Arrangement of the Periodic Table — Cumulative exam Answers

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1
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Which molecular geometry is least likely to occur with sp3 hybridization?

A
tetrahedral
B
trigonal planar
C
bent
D
trigonal pyramidal
2
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Which is a general representation of a secondary amine?

A
An N is bonded to two electron dots above; with a dotted triangular line to an H, a solid triangular line to an H, and single line to an H; it is noted that the angle between the last 2 H atoms is 107 degrees.
Option A
B
An N with 2 electron dots is linked to an R 1 group with a single line, an H with a triangular line, and and H with a dotted line.
Option B
C
An N with 2 electron dots is linked to an R 1 group with a single line, an R 2 group with a triangular line, and and H with a dotted line.
Option C
D
An N with 2 electron dots is linked to an R 1 group with a single line, an R 2 group with a triangular line, and an R 3 with a dotted line.
Option D
3

A patient is receiving treatments for brain cancer. Which electromagnetic waves are most likely being used as part of the treatment?

A
infrared
B
ultraviolet
C
microwave
D
gamma ray
4

Rachel is performing an acid-base titration. She hopes to determine the concentration of an unknown acid solution to two decimal places. Which is the best tool to find the volume of the base that she needs to neutralize the acid?

A
beaker
B
Erlenmeyer flask
C
graduated cylinder
D
buret
5

Which of the following do Lewis structures help us understand?

A
the exact structure of a molecule
B
the number of electrons that are involved in the bonding of the molecule
C
the total number of electrons in a molecule
D
how electrons attract other electrons in a molecule
6

Which of the following could form an ionic bond with an anion?

A
Hg22+
B
NO2–
C
SO32–
D
Ar
7

To explain the photoelectric effect, Albert Einstein linked the photoelectric effect to an idea from which scientist?

A
Heinrich Hertz
B
Isaac Newton
C
Max Planck
D
Thomas Young
8

Which compound most likely contains polar covalent bonds?

A
NaCl
B
AlF3
C
Br2
D
NF3
9

Consider the Lewis dot structure for boron trifluoride (BF3).What is the molecular shape of BF3?

Question illustration
A
bent
B
tetrahedral
C
trigonal planar
D
trigonal pyramidal
10

An electron in a hydrogen atom moves from level 3 to level 1. In a second hydrogen atom, an electron drops from level 2 to level 1. Which statement describes the most likely result?

A
The first atom emits light with more energy.
B
The second atom emits light with more energy.
C
The first and second atoms absorb energy without emitting light.
D
The first and second atoms emit light with the same amount of energy.
11

Based on its location in the periodic table, what can most likely be predicted about sulfur?

A
It has four valence electrons available for bonding.
B
It has four nonbonding electrons.
C
It has six valence electrons available for bonding.
D
It has six nonbonding electrons.
12

If a substance reacts with oxygen, the chemical reaction is most likely a

A
combustion reaction.
B
decomposition reaction.
C
single replacement reaction.
D
double replacement reaction.
13

Walt made a study chart listing uses for two types of electromagnetic waves.

Question illustration
A
A: Infrared WavesB: X-rays
B
A: MicrowavesB: Ultraviolet Waves
C
A: Ultraviolet WavesB: Gamma Rays
D
A: X-raysB: Radio Waves
14

Which statement is true about an empirical formula?

A
It is the true ratio of atoms in a formula unit.
B
It is the simplest ratio of atoms in a formula unit.
C
It represents the true molecular mass of a chemical formula.
D
It represents the highest ratio of coefficients in a chemical formula.
15

In which two types of reactions do opposite chemical changes occur?

A
double replacement and combustion
B
single replacement and double replacement
C
synthesis and decomposition
D
combustion and synthesis
16

Yusef adds all of the values in his data set and then divides by the number of values in the set.What is Yusef most likely finding?

A
the percent error
B
the median
C
the standard deviation
D
the mean
17

A piece of sodium metal can be described as

A
a pure substance and a compound.
B
an impure substance that is reactive.
C
an impure substance that is unreactive.
D
a pure substance and an element.
18

Who reported four “element” classifications, but included some substances that were combinations of elements rather than true elements in his listing?

A
Henry Moseley
B
Dmitri Mendeleev
C
Antoine Lavoisier
D
Johann Dobereiner
19

The MSDS for glacial acetic acid says that it is a flammable liquid that can severely burn any human tissue it comes in contact with. It reacts with bases, various metals, and strong oxidizing agents. Its vapors can form explosive mixtures with air. Based on this information, which statement is applicable to glacial acetic acid?

A
It should be heated to remove moisture and stored on a lab shelf.
B
It should be handled on a clean, dry area of the lab bench.
C
It should be stored in an iron container, away from open flames.
D
It should be handled in a fume hood, away from open flames.
20

The accepted value for the density of liquid mercury is 13.5336 g/mL. Four scientists measure the density of liquid mercury in their individual laboratories. The most accurate measurement is made by

A
Dr. Chopra, who measures 13.487 g/mL.
B
Dr. Thompson, who measures 13.5 g/mL.
C
Dr. Smith, who measures 13.54 g/mL.
D
Dr. Tyler, who measures 13.9336 g/mL.

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