Which of the following is true about the electron configurations of the noble gases?

The highest occupied s and p sublevels are completely filled.

Why are isotopes used in nuclear chemistry?

the “unbalanced” properties of isotopes can create powerful reactions

Aristotle stated that...

all things are made of fire, earth, air, and water.

What did Dmitri Mendeleev contribute to chemistry?

organized the periodic table of elements

What does it mean when an electron is excited?

electron moves up to higher energy level

According to the Aufbau principle, ____.

electrons enter orbitals of lowest energy first

Emission of light from an atom occurs when an electron ____.

drops from a higher to a lower energy level

What rule is shown here and why is the bottom incorrect?

Hund’s Rule, electrons must occupy separate sub-orbitals before pairing u

Which of the following is NOT true?

Liquids have an indefinite shape and indefinite volume

What is the Law of Conservation of Mass and Energy?

energy and mass cannot be created or destroyed

Why is the Lewis dot structure helpful?

shows valence electrons of atom to visualize bonds between atoms

What rule is shown here and why is the top incorrect?

Pauli exclusion principle, electrons must exhibit opposite spin

What happens during a chemical change?

atoms are arranged in different ways

How are elements and compounds different?

an element is the simplest pure substance

Which of the following statements is NOT true?

Atoms of isotopes of an element have different numbers of protons.

What is the octet rule?

Atoms want to have 8 electrons around them

Lanthanides and actinides both...

are the only periods to have an f orbital

Although Alchemy was fundamentally wrong in nature what beneficial things came from it?

useful lab equipment and techniques were created

Democritus stated that...

all things are made of tiny particles called atoms.

How will you study for the exam?

Do the study guide early and review KAHOOT, Talk to friends about difficult concepts

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Unit 1 Review CHEM

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Answers

1
Which of the following is true about the electron configurations of the noble gases?
The electrons with the highest energy are in an f sublevel.
The electrons with the highest energy are in a d sublevel.
The highest occupied s and p sublevels are completely filled.
The highest occupied s and p sublevels are partially filled.
2
Why are isotopes used in nuclear chemistry?
all isotopes are radioactive
only isotopes can fuel nuclear reactions
the “unbalanced” properties of isotopes can create powerful reactions
isotopes are stable and perfect for nuclear reactions
3
Aristotle stated that...
all things are made of fire, earth, air, and ice.
all things are made of small particles called molecular bonds.
all things are made of fire, earth, air, and water.
all things are made of tiny particles called atoms.
4
What did John Dalton prove in the mid 1700’s?
all things are made of tiny particles called atoms.
water is not an element but a compound
all of the above
air is not an element because it is made of different gasses
5
An element has an atomic number of 48. The number of protons and electrons in a neutral atom of the element are ____.
48 protons and 48 electrons
96 protons and 48 electrons
24 protons and 24 electrons
48 protons and 0 electrons
6
What is the sum of electrons that can be held in one level of the s and p orbital?
8
6
15
11
7
What did Dmitri Mendeleev contribute to chemistry?
organized the periodic table of elements
discovered the composition of water
created atomic theory
discovered phosphorus
8
This image shows what model?
Bohr Model
Hund’s Model
Aufbau Model
Pauli Exclusion Model
9
The letter "p" in the symbol 4p3 indicates the ____.
principle energy level
orbital shape
spin of an electron
speed of an electron
10
What is the element with the highest electronegativity value?
Helium
Flourine
Calcium
Cesium
11
What group is shown here?
noble gases
alkali metals
transition metals
halogens
12
If the spin of one electron in an orbital is clockwise, what is the spin of the other electron in that orbital?
counterclockwise
clockwise
zero
both clockwise and counterclockwise
13
What does it mean when an electron is excited?
electron spins faster
electron moves up to lower energy level
electron moves up to higher energy level
Electron moves uncontrollably
14
What happens to kinetic energy as heat is lost?
kinetic energy decreases
an exothermic phase change happens as heat is absorbed
molecules move faster
kinetic energy increases
15
According to the Aufbau principle, ____.
electrons enter orbitals of lowest energy first
an orbital may be occupied by only two electrons
electrons enter orbitals of highest energy first
electrons in the same orbital must have opposite spins
16
How does atomic radius change from left to right across a period in the periodic table?
It tends to increase.
It first increases, then decreases.
It first decreases, then increases.
It tends to decrease.
17
Emission of light from an atom occurs when an electron ____.
drops from a higher to a lower energy level
moves within its atomic orbital
jumps from a lower to a higher energy level
falls into the nucleus
18
What is the number of valence electrons in an oxygen atom?
6
2
8
4
19
This electron configuration diagram is for the element….
Silicon
Phosphorus
Magnesium
sodium
20
Which of the following IS matter?
time
sound
light
none of the above
21
How many half-filled orbitals are in a bromine atom?
4
1
2
3
22
All matter has what two things?
mass and weight
weight and size
mass and time
mass and volume
23
What rule is shown here and why is the bottom incorrect?
Hund’s Rule, electrons must occupy separate sub-orbitals before pairing u
Hund’s Rule, electrons must exhibit opposite spin
Hund’s Rule, electrons must occupy lower energy level first
Pauli exclusion principle, electrons cannot move
24
Which of the following is NOT true?
Solids have a definite shape and volume
Solids have particles closely together in a fixed order
Liquids have an indefinite shape and indefinite volume
Gasses have particles spaced far apart in constant motion
25
What are the 4 type of orbitals?
s, p, e, f
s, p, d, f
s, p, d, g
s, p, d, h
26
What are valence electrons?
Electrons in the 1st-2nd orbital
Electrons in the outer orbital
Electrons in the first orbital
Electrons in the last 2 orbitals
27
What is the Law of Conservation of Mass and Energy?
energy and mass cannot be created or destroyed
energy cannot be created while mass can
energy and mass cannot be created but can be destroyed
energy can be created while mass cannot
28
Of the elements Pt, V, Li, and Kr, which is a nonmetal?
Li
Pt
V
Kr
29
Why is the Lewis dot structure helpful?
Shows bonding energy between atoms
shows relative energy levels of atom
shows valence electrons of atom to visualize bonds between atoms
shows all energy levels of atom
30
Which of the following elements is in the same period as phosphorus?
nitrogen
oxygen
carbon
magnesium
31
Which of the following is a physical change?
digestion
cooking an egg
crushing a peanut
rusting of metal
32
Potassium at ground state has electrons found in which highest orbital?
3p
4s
3s
3d
33
Table sugar is a...
heterogeneous mixture
mixture
compound
element
34
How many valence electrons are in Fluorine?
9
7
10
8
35
Each period in the periodic table corresponds to ____.
a principal energy level
ionization energy
mass of element
a shape of an atom
36
What rule is shown here and why is the top incorrect?
Pauli exclusion principle, electrons cannot move
Hund’s Rule, electrons must exhibit opposite spin
Pauli exclusion principle, electrons must exhibit opposite spin
Bohr model, electrons must exhibit opposite spin
37
To what category of elements does an element belong if it is a poor conductor of electricity?
metalloids
nonmetals
metals
transition elements
38
What happens during a chemical change?
atoms are arranged in different ways
temperature changes occur
gasses are produced
one substance always becomes two new substances
39
What group is shown here?
transition metals
alkali metals
halogens
noble gases
40
How are elements and compounds different?
an element is the simplest pure substance
compounds are always made with the same type of elements
a compound is the simplest pure substance
compounds are always made with three or more elements
41
Which of the following statements is NOT true?
The nucleus of an atom has a positive charge.
Atoms of isotopes of an element have different numbers of protons.
Atoms are mostly empty space.
Atoms of the same element can have different masses.
42
Most elements are...
Ullmannoids
metals
metalloids
non-metals
43
What is the octet rule?
Electrons want to have 9 electrons around them
Atoms want to have 10 electrons around them
Atoms want to have 7 electrons around them
Atoms want to have 8 electrons around them
44
Which of the following is an endothermic reaction?
Water vapor (gas) --> water
Ice --> Liquid water
water --> Ice
None of the above
45
What element has the electron configuration 1s2 2s2 2p6 3s2 3p2 ?
silver
silicon
nitrogen
selenium
46
Which set is correct?
Cs, 55 protons, 132.9 electrons
Zn, 30 protons, 60 electrons
In, 49 protons, 49 electrons
F, 19 protons, 19 electrons
47
Lanthanides and actinides both...
are the only elements to react violently in water
are the only periods to have an f orbital
are radioactive
are only found naturally in nature
48
Although Alchemy was fundamentally wrong in nature what beneficial things came from it?
useful lab equipment and techniques were created
gold was collected from urine
math was invented from it
silver was collected from urine
49
Democritus stated that...
all things are made of tiny particles called atoms.
all things are made of fire, earth, air, and ice.
all things are made of small particles called molecular bonds.
all things are made of fire, earth, air, and earth.
50
How will you study for the exam?
Do the study guide early and review KAHOOT
Studying is for chumps! hah!
watch tv, snapchat, instagram, twitter, and eat while "studying"
Talk to friends about difficult concepts

Unit 1 Review CHEM Flashcards | StudBud