Answers2025-2026_MDCPS_2003345_Chemistry_1_A-CRCumulative Exam

Cumulative Exam — Cumulative exam Answers

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The diagram below shows that the periodic table is divided into different blocks.Elements that have complete valence electron shells are mostly found in the

Question illustration
A
s block.
B
d block.
C
p block.
D
f block.
22
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Consider the following reversible reaction.What is the equilibrium constant expression for the given system?

Question illustration
A
mc031-2.jpg
Option A
B
K subscript e q equals StartFraction StartBracket upper C upper O subscript 2 EndBracket over StartBracket upper O subscript 2 EndBracket EndFraction.
Option B
C
K subscript e q equals StartFraction StartBracket upper C EndBracket StartBracket upper O subscript 2 EndBracket over StartBracket upper C upper O subscript 2 EndBracket EndFraction.
Option C
D
K subscript e q equals StartFraction StartBracket upper O subscript 2 EndBracket over StartBracket upper C upper O subscript 2 EndBracket EndFraction.
Option D
23

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.
24

Which method for treating arthritis is an example of pseudoscience?

A
diet
B
drugs
C
exercise
D
magnets
25

Francine makes several measurements of the mass of a metal block. The data set is shown in the table below.MeasurementMass of metal block (g)120.73220.76320.68420.75After analyzing this data set, Francine calculates a value of 20.73 g. Which of these characteristics has been calculated?

A
mean
B
median
C
mode
D
range
26

What is the true ratio of atoms in a molecule or formula unit called?

A
the molecular formula
B
the molar mass
C
the percent composition
D
the empirical formula
27

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.
28

In an experiment, a student wants to increase the rate of a reaction that involves gases. Which change to the reactants would accomplish this?

A
Increase the volume to decrease pressure and to increase concentration.
B
Increase the volume to increase pressure and to decrease concentration.
C
Decrease the volume to decrease pressure and to increase concentration.
D
Decrease the volume to increase pressure and to increase concentration.
29

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.
30

Error

Answer not available
31

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
32

Sodium chloride is made up of clear, colorless crystals. A solution of sodium chloride in water is a good conductor of electricity. Which statement describes sodium chloride?

A
It is made up of ions that are held together by ionic bonds.
B
It is made up of atoms that are held together by metallic bonds.
C
It is made up of atoms that are held together by covalent bonds with equal sharing of electrons.
D
It is made up of atoms that are held together by covalent bonds with unequal sharing of electrons.
33

Which element would most likely have chemical properties similar to that of fluorine (F)?

A
Ne
B
N
C
Li
D
Br
34

Based on the activity series provided, which reactants will form products?F > Cl > Br > I

A
CuI2 + Br2
Option A
B
Cl2 + AlF3
Option B
C
Br2 + NaCl
Option C
D
CuF2 + I2
Option D
35

Error

Answer not available
36

According to the collision theory, which is required for a high number of effective collisions?

A
a very low amount of force from colliding molecules
B
a very low amount of kinetic energy from colliding molecules
C
molecular collisions that have very specific orientations
D
molecular collisions with energy to overcome activation energy
37

Error

Answer not available
38

A sample of water is taken and kept in a beaker in a freezer at a constant temperature of 0°C. If the system is at dynamic equilibrium, which of these statements is true?

A
The rate of freezing is equal to the rate of melting.
B
The rate of freezing is greater than the rate of melting.
C
The amount of ice is greater than the amount of water.
D
The amount of ice is equal to the amount of water.
39

When a drawing of a circle made in the center of a piece of paper with a black marker gets wet, the marker bleeds, and as the water moves through the paper the ink separates into several colors. What method of separation does this describe?

A
evaporation
B
distillation
C
filtration
D
chromatography
40

Error

Answer not available

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