AnswersCPS Online Chemistry fall – 1-2027Electrons and the Periodic Table

Electrons and the Periodic Table — Unit test Answers

25 verified answers2 views
1
Free Preview

Which substance is a mixture?

A
table salt
B
gasoline
C
aluminum
D
carbon dioxide
2
Free Preview

Which factor is most important to consider when evaluating a journal article about global warming?

A
Is the article long enough?
B
Does the article contain facts or only opinions?
C
Did the author of the article use complex, scientific words?
D
Does the author of the article have a doctorate degree?
3

Which of Dalton's ideas about the atom did J.J. Thomson's experiment disprove?

A
It disproved that atoms are divisible.
B
It disproved that atoms are indivisible.
C
It disproved that atoms contain protons.
D
It disproved that atoms contain electrons.
4

Iron, an element with the chemical symbol Fe, is an important element. It is used to make steel and is part of the substance that transports oxygen throughout the human body.Which statement about Fe is supported by the modern atomic theory but not John Dalton’s theory?

A
The element iron is composed of small particles called atoms.
B
The electrons of iron have probable locations in a region of space around the nucleus.
C
Iron atoms combine with other atoms in whole number ratios to form compounds.
D
Chemical reactions that involve iron do not create new atoms of iron.
5

Which is a positive effect of using chemistry?

A
The synthesis of drugs to disease may increase adverse reactions in others.
B
The use of herbicides to increase resistance in tolerant plants.
C
Fertilizer runoff from farms into natural waters will purify water systems.
D
Energy can be generated without burning fossil fuels.
6

Which statement best describes how electrons fill orbitals in the periodic table?

A
Electrons fill orbitals in order of their increasing energy from left to right.
B
Electrons fill orbitals in order of their increasing energy from right to left.
C
Elements fill orbitals in order of increasing energy from top to bottom in each group.
D
Elements fill orbitals in order of increasing energy from bottom to top in each group.
7

Hydrogen has three isotopes 1H, 2H, and 3H. What is the difference between these three isotopes?

A
The number of protons ranges from 1 to 3.
B
The number of electrons ranges from 1 to 3.
C
The number of neutrons ranges from 0 to 2.
D
The number of protons ranges from 0 to 2.
8

What did Ernest Rutherford’s gold foil experiment demonstrate about an atom?

A
Each atom is composed of electrons and positive material.
B
The mass of the atom is evenly spread throughout the atom.
C
Neutrons are located in the center of the atom.
D
Positive charge occupies a very small volume in the atom.
9

How did Niels Bohr describe electrons in his atomic model?

A
Their energies can have any values.
B
Their exact positions cannot be known.
C
They have high probability to be found in certain regions.
D
They orbit the central nucleus in discrete paths.
10

How many valence electrons does aluminum (Al) have available for bonding?

A
1
B
2
C
3
D
4
11

A single atom of an element has 11 protons, 11 electrons, and 12 neutrons. Which element is it?

A
V
B
Na
C
Mg
D
Se
12

Which set of numbers gives the correct possible values of l for n = 2?

A
0
B
0, 1
C
0, 1, 2
D
0, 1, 2, 3
13

To show the electron configuration for an atom, when would it be better to use an orbital notation than to use a written configuration with numbers, letters, and superscripts?

A
when the aim is to use less space
B
when the aim is to show electron spins
C
when the aim is to show orbital shapes in subshells
D
when the aim is to show electron distributions in shells
14

How is the mode of a data set defined?

A
It is the middle value of the set.
B
It is the most common value in the set.
C
It is the average of the different values in the set.
D
It is the difference between the highest and lowest values of the set.
15

Air is made up of different gases, such as oxygen, nitrogen, and carbon dioxide. Which statement best describes these three components of air?

A
Oxygen, nitrogen, and carbon dioxide are all classified as pure substances.
B
Oxygen, nitrogen, and carbon dioxide cannot react with another substance.
C
Oxygen, nitrogen, and carbon dioxide are chemically bonded to one another.
D
Oxygen, nitrogen, and carbon dioxide can be classified as elements.
16

Among the elements of the main group, the general trend in the first ionization energy moving across a period is not followed between group 2 and group 13. Which best explains these exceptions?

A
The ionization energy decreases because the full s orbital shields the electron entering the p orbital.
B
The ionization energy increases because the full s orbital shields the electron entering the p orbital.
C
The ionization energy decreases because the stability of the half-full p subshell is increased.
D
The ionization energy increases because the stability of the half-full p subshell is increased.
17

What is the atomic number of zirconium?

A
39
B
40
C
41
D
42
18

A teacher discusses a scientific theory that has been in place for almost a century. Which would present the greatest challenge to this theory?

A
lists of what the theory cannot explain
B
discussion of the theory on Internet blogs
C
results from new experiments that contradict the theory
D
opinions of a vocal group of citizens that oppose the theory
19

Which element has the largest atomic radius?

A
As
B
N
C
P
D
Sb
20

In 1971, a physicist named Gabor received the Nobel Prize for developing the basic ideas of holography, a method of producing a three-dimensional image of an object. His work marked a major advance in laser technology and occurred without much previous work in this area. Based on this information, which statement is most likely true of Gabor?

A
He was extremely creative and open to new ideas.
B
He was not curious about many facets of laser science.
C
He was interested in collaborating with a diverse group of scientists.
D
He was skeptical of his own work and the work of other laser scientists.

Did you find these answers helpful?

More from this Course

Quiz
10 verified answers

Solids and Plasmas

Quiz
10 verified answers

Phase Changes

Quiz
10 verified answers

Changes in Matter

Electrons and the Periodic Table — Unit test…