AnswersSY2026-27 - 2003340 Chemistry 1 Sem 2 CRWriting and Balancing Chemical Equations

Writing and Balancing Chemical Equations — Cumulative exam Answers

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21
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What is the name of the ionic compound RbCl?

A
rubidium chloride
B
chlorine rubidium
C
rubidium chlorine
D
chlorine rubidide
22
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The figure shows the hybrid orbitals of methane. Which molecule has the same shape and hybridization as methane?

Question illustration
A
SO3
B
C2H2
C
CH2O
D
CF2Cl2
23

What is the best reason for the scientific community to accept a theory?

A
The theory is supported by all the available observations and data.
B
An award-winning scientist proposed the theory.
C
The majority of the general public agrees with the theory.
D
The theory contradicts an older theory.
24

Assuming the compound is dissolved in water, what is the formula for phosphorous acid?NameSymbolphosphatePOphosphitePOphosphorusP

Question illustration
A
H3P
B
H3PO4
C
HP
D
H3PO3
25

Which is true of transition metals when moving from left to right on the periodic table?

A
The d sublevels are not filled across the period.
B
The cation radii become larger across the period.
C
Atomic radii increase slightly and then start to decrease.
D
Atomic radii decrease slightly and then start to increase.
26

Many pharmaceutical drugs are organic compounds that were originally synthesized in the laboratory. Which two scientific disciplines are bridged by pharmaceutical drugs?

A
chemistry and forensics
B
chemistry and medicine
C
biology and forensics
D
biology and criminology
27

An entire group of elements was unknown when the periodic table was first developed because they were unreactive and no known compounds were composed of them. What most likely led to the inclusion of these elements in the periodic table?

A
the formation of a compound in the laboratory
B
new technology that showed how to identify one of the elements
C
improvements in instruments to measure small masses
D
more careful experiments to create synthetic elements
28

The periodic table below shows the electronegativity values of some elements.ElectronegativitiesConsider the positions of barium (Ba), sulfur (S), silicon (Si), and calcium (Ca) on the periodic table. The atoms of which element require the least amount of energy to give up an electron when forming chemical bonds?

Question illustration
A
barium
B
sulfur
C
silicon
D
calcium
29

The diagram below compares hypotheses, theories, and laws.What term is missing from the central region that describes hypotheses, theories, and laws?

Question illustration
A
popular
B
predictable
C
mathematical
D
falsifiable
30

Kumar is producing the photoelectric effect by using red light. He wants to increase the energy of emitted electrons. Based on the research of Albert Einstein, what is the best way for him to do this?

A
Increase the intensity of red light.
B
Decrease the intensity of red light.
C
Use a different colored light that has a higher frequency.
D
Use a different colored light that has a lower frequency.
31

Why is it advisable to wear long sleeves when students work in a chemistry lab?

A
to provide warmth near the lab refrigerator
B
to protect the arms from lab chemicals
C
to minimize burns from hot water at the lab sink
D
to prevent burns when using a Bunsen burner
32

An element has five valence electrons available for bonding. This element is most likely which of the following?

A
boron
B
phosphorus
C
tin
D
tellurium
33

The first known telescopes, used around 1600, consisted of a lens and an eyepiece. Today, telescopes are often computer controlled and consist of a complicated array of sophisticated lenses. Which statement correctly describes how telescopes have changed over time?

A
The telescopes of the 1600s were used until the year 2000, when a more sophisticated telescope was built.
B
The telescopes of the 1600s were gradually improved upon over time, resulting in the telescopes that are available today.
C
The telescopes of the 1600s were used until the year 1900, when a more sophisticated telescope was built that was used until the year 2000.
D
The telescopes of the 1600s were abandoned after about 50 years, and the technology was completely replaced.
34

Consider the unbalanced equation for the oxidation of aluminum._Al + _O2 _Al2O3Which sequence of coefficients should be placed in the blanks to balance this equation?

Question illustration
A
2, 3, 1
B
1, 3, 2
C
4, 3, 2
D
3, 2, 3
35

A single atom of an element has 21 neutrons, 20 electrons, and 20 protons. Which element is it?

A
K
B
Zr
C
Ca
D
Sc
36

Which diagram shows electrons violating the Pauli exclusion principle?

A
A box contains an up arrow.
Option A
B
A box contains an up and a down arrow.
Option B
C
A box contains an up and a down arrow.
Option C
D
A box contains an up and a down arrow.
Option D
37

Two students are given two different size blocks of the same substance and are instructed to determine the properties of the substance. Which statement describes a property that will be the same for both students?

A
length because it is an extensive property
B
mass because it is an extensive property
C
boiling point because it is an intensive property
D
volume because it is an intensive property
38

The table below gives the numbers of protons, electrons, and neutrons in four atoms.AtomNumber of protonsNumber of electronsNumber of neutrons1393952240405033939544404051Based on the information that is given, which atom in the table has the highest mass?

A
1
B
2
C
3
D
4
39

Which statement best explains why the atomic theory developed efficiently?

A
Scientists ignored all previous knowledge about atoms.
B
Scientists had used creativity and the scientific method in their investigations.
C
Scientists had used a philosophical viewpoint as a method of investigation.
D
Scientists rarely repeated experiments to make sure the results were correct.
40

A teacher wants to perform a classroom demonstration that illustrates both chemical and physical changes. Which would be the best demonstration that she could use?

A
bending a piece of aluminum
B
breaking a matchstick
C
dissolving sugar in water
D
burning a candle

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