Question 1

According to the wave-mechanical model,
an orbital is defined as the most probable
location of

Accepted Answer

an electron

Answer

a neutron

Answer

a positron

Answer

a proton

Question 2

The part of an atom that has an overall positive
charge is called

Accepted Answer

the nucleus

Answer

the first shell

Answer

the valence shell

Answer

an electron

Question 3

Which subatomic particles each have a mass of
approximately 1 u?

Accepted Answer

proton and neutron

Answer

neutron and positron

Answer

neutron and electron

Answer

proton and electron

Question 4

The discovery of the electron as a subatomic
particle was a result of

Accepted Answer

experiments with cathode ray tubes

Answer

the gold-foil experiment

Answer

collision theory

Answer

kinetic molecular theory

Question 5

The elements on the Periodic Table of the
Elements are arranged in order of increasing

Accepted Answer

atomic number

Answer

atomic mass

Answer

formula mass

Answer

oxidation number

Question 6

Which element is classified as a metalloid?

Accepted Answer

$	ext{Te}$

Answer

$	ext{S}$

Answer

$	ext{I}$

Answer

$	ext{Hg}$

Question 7

Which substance can be broken down by
chemical means?

Accepted Answer

ammonia

Answer

antimony

Answer

argon

Answer

aluminum

Question 8

Which statement describes $	ext{H}_2	ext{O}(l)$ and $	ext{H}_2	ext{O}_2(l)$?

Accepted Answer

Both are compounds that have different
properties.

Answer

Both are mixtures that have different
properties.

Answer

Both are compounds that have the same
properties.

Answer

Both are mixtures that have the same
properties.

Question 9

At which temperature and pressure would a
sample of helium behave most like an ideal
gas?

Accepted Answer

$600.\,	ext{K}$ and $50. \,	ext{kPa}$

Answer

$150.\,	ext{K}$ and $500. \,	ext{kPa}$

Answer

$75\,	ext{K}$ and $500. \,	ext{kPa}$

Answer

$300.\,	ext{K}$ and $50. \,	ext{kPa}$

Question 10

Which sample at STP has the same number of
atoms as $18\,	ext {liters}$ of $	ext{Ne}(	ext{g})$ at STP?

Accepted Answer

$18\,	ext{liters}$ of$ 	ext{Ar}(	ext{g})$

Answer

$18\,	ext{moles}$ of$ 	ext{Ar}(	ext{g})$

Answer

$18\,	ext{grams}$ of  $	ext{H}_2	ext{O}(	ext{g})$

Answer

$18\,	ext{milliliters}$ of  $	ext{H}_2	ext{O}(	ext{g})$

Question 11

In terms of entropy and energy, systems in
nature tend to undergo changes toward

Accepted Answer

higher entropy and lower energy

Answer

lower entropy and higher energy

Answer

lower entropy and lower energy

Answer

higher entropy and higher energy

Question 12

Amines, amides, and amino acids are
categories of

Accepted Answer

organic compounds

Answer

isomers

Answer

inorganic compounds

Answer

isotopes

Question 13

Which type of reaction produces soap?

Accepted Answer

saponification

Answer

combustion

Answer

polymerization

Answer

fermentation

Question 14

For a reaction system at equilibrium,
LeChatelier's principle can be used to
predict the

Accepted Answer

effect of a stress on the system

Answer

type of bonds in the reactants

Answer

activation energy for the system

Answer

polarity of the product molecules

Question 15

Which value changes when a $	ext{Cu}$ atom
becomes a $	ext{Cu}^{2+}	ext{ion}?$

Accepted Answer

oxidation number

Answer

number of protons

Answer

number of neutrons

Answer

mass number

Question 16

Which reaction occurs at the anode in an
electrochemical cell?

Accepted Answer

oxidation

Answer

substitution

Answer

reduction

Answer

combustion

Question 17

What evidence indicates that the nuclei of
strontium-90 atoms are unstable?

Accepted Answer

Strontium-90 atoms spontaneously emit
beta particles.

Answer

Strontium-90 electrons are in the ground
state.

Answer

Strontium-90 atoms spontaneously absorb
beta particles.

Answer

Strontium-90 electrons are in the excited
state.

Question 18

Which nuclear emission is listed with its
notation?

Accepted Answer

gamma radiation, $\begin{matrix}\small0\\small0\end{matrix}\gamma$

Answer

alpha particle, $\,\begin{matrix}\small1\\small1\end{matrix} {\large 	ext H}$

Answer

neutron, $\begin{matrix}\enspace\small0\\small-1\end{matrix} {\large\beta}$

Answer

proton, $\,\begin{matrix}\small4\\small2\end{matrix} {\large 	ext {He}}$

Question 19

What is the net charge of an ion that has 11 protons,
10 electrons, and 12 neutrons?

Accepted Answer

$1+$

Answer

$1-$

Answer

$2+$

Answer

$2-$

Question 20

Which electron configuration represents the
electrons of an atom in an excited state?

Accepted Answer

$2-5-1$

Answer

$2-8-5$

Answer

$2-5$

Answer

$2-6$

Question 21

Which element is a liquid at $1000. 	ext{K}$?

Accepted Answer

$	ext{Al}$

Answer

$	ext{Ni}$

Answer

$	ext{Ca}$

Answer

$	ext{Ag}$

Question 22

Which formula represents ammonium
nitrate?

Accepted Answer

$	ext{NH}_4	ext{NO}_3$

Answer

$	ext{NH}_4(	ext{NO}_3)_2$

Answer

$	ext{NH}_4	ext{NO}_2$

Answer

$	ext{NH}_4(	ext{NO}_2)_2$

Question 23

The empirical formula for butene is

Accepted Answer

$	ext{CH}_2$

Answer

$	ext{C}_4	ext{H}_8$

Answer

$	ext{C}_4	ext{H}_6$

Answer

$	ext{C}_2	ext{H}_4$

Question 24

Which equation represents a conservation of
charge?

Accepted Answer

$3	ext{Fe}^{3+} + 	ext{Al} ightarrow 3	ext{Fe}^{2+}  + 	ext{Al} ^{3+}$

Answer

$2	ext{Fe}^{3+} + 2	ext{Al} ightarrow 3	ext{Fe}^{2+}  + 2	ext{Al} ^{3+}$

Answer

$2	ext{Fe}^{3+} + 	ext{Al} ightarrow 2	ext{Fe}^{2+}  + 	ext{Al} ^{3+}$

Answer

$3	ext{Fe}^{3+} + 2	ext{Al} ightarrow 2	ext{Fe}^{2+}  + 2	ext{Al} ^{3+}$

Question 25

Given the balanced equation representing a
reaction:

$2	ext{H}_2 + 	ext{O}_2 ightarrow 2	ext{H}_2	ext{O}  + 	ext{energy}$

Which type of reaction is represented by this
equation?

Accepted Answer

synthesis

Answer

double replacement

Answer

decomposition

Answer

single replacement

Question 26

A solution is prepared using $0.125\,	ext{g}$ of
glucose, $	ext{C}_6	ext{H}_{12}	ext{O}_6,$ in enough water to make
$250.\,	ext{g}$ of total solution. The concentration of
this solution, expressed in parts per million, is

Accepted Answer

$5.00 	imes10^2\, 	ext{ppm}$

Answer

$5.00 	imes10^1\, 	ext{ppm}$

Answer

$5.00 	imes10^4\, 	ext{ppm}$

Answer

$5.00 	imes10^3\, 	ext{ppm}$

Question 27

A sample of a gas in a rigid cylinder with a
movable piston has a volume of $11.2\, 	ext{liters}$ at
STP. What is the volume of this gas at $202.6\,	ext{kPa}$
and $300.\,	ext{K}?$

Accepted Answer

$6.15\, 	ext{L}$

Answer

$24.6\, 	ext{L}$

Answer

$22.4\, 	ext{L}$

Answer

$5.10\, 	ext{L}$

Question 28

The equation below represents a reaction
between two molecules, $X_2$ and$ Z_2$. These
molecules form an "activated complex," which
then forms molecules of the product.

Which diagram represents the most likely
orientation of $ X^2$ and $Z^2$ when the molecules
collide with proper energy, producing an
activated complex?

Accepted Answer

https://uploads.quizalize.com/0a03194b-6b1a-7e6f-7bb9-e6dce2a1a261/question/11dd27dc-441c-569b-1fa0-fbe0464fbc5e.png

Answer

https://uploads.quizalize.com/0a03194b-6b1a-7e6f-7bb9-e6dce2a1a261/question/e637540f-94df-cb39-d66f-3279fd59873d.png

Answer

https://uploads.quizalize.com/0a03194b-6b1a-7e6f-7bb9-e6dce2a1a261/question/a5281752-88f1-6eb0-937e-a87f8bc5b544.png

Answer

https://uploads.quizalize.com/0a03194b-6b1a-7e6f-7bb9-e6dce2a1a261/question/cda8dd19-03ce-0bd9-95fc-c5407b80726c.png

Question 29

What is the chemical name for the compound
$	ext{CH}_3	ext{CH}_2	ext{CH}_2	ext{CH}_3?$

Accepted Answer

butane

Answer

decene

Answer

butene

Answer

decane

Question 30

In a laboratory activity, the density of a sample
of vanadium is determined to be $6.9 	ext{g}/	ext{cm}^3$
at room temperature. What is the percent
error for the determined value?

Accepted Answer

$15\%$

Answer

$0.15\%$

Answer

$0.87\%$

Answer

$13\%$

Question 31

Given the equation representing a reaction:

$	ext{Cd}+ 	ext{NiO}_2 +2	ext{H}_2	ext{O}   ightarrow  	ext{Cd}(	ext{OH})_2+	ext {Ni}(	ext{OH})_2$

Which half-reaction equation represents the
oxidation in the reaction?

Accepted Answer

$	ext{Cd} ightarrow 	ext{Cd}^{2+}+2	ext{e}^-$

Answer

$	ext{Ni}^{4+} ightarrow 	ext{Ni}^{2+}+2	ext{e}^-$

Answer

$	ext{Ni}^{4+} + 2	ext{e}^- ightarrow 	ext{Ni}^{2+}$

Answer

$	ext{Cd}+ 2	ext{e}^-ightarrow	ext{Cd}^	ext{2+}$

Question 32

Which metal reacts spontaneously with
$	ext{NiCl}_2	ext{(aq)}?$

Accepted Answer

$	ext{Zn}	ext{(s)}$

Answer

$	ext{Sn}	ext{(s)}$

Answer

$	ext{Au}	ext{(s)}$

Answer

$	ext{Cu}	ext{(s)}$

Question 33

Which solution is the best conductor of an
electric current?

Accepted Answer

$0.1\,	ext{mole}$ of $	ext{NaCl}$ dissolved in $1000.\,	ext{mL}$ of water

Answer

$0.005\,	ext{mole}$ of $	ext{NaCl}$ dissolved in $1000.\,	ext{mL}$ of water

Answer

$0.05\,	ext{mole}$ of $	ext{NaCl}$ dissolved in $1000.\,	ext{mL}$ of water

Answer

$0.001\,	ext {mole}$ of $	ext{NaCl}$ dissolved in $1000.\,	ext{mL}$ of water

Question 34

Compared to a $1.0$-liter aqueous solution with a $	ext{pH}$ of $7.0,$a $1.0$-liter aqueous solution with a $	ext{pH}$ of $5.0$ contains

Accepted Answer

$100$ times more hydronium ions

Answer

$10$ times more hydroxide ions

Answer

$10$ times more hydronium ions

Answer

$100$ times more hydroxide ions

Question 35

The results of the gold foil experiment led to the
conclusion that an atom is

Accepted Answer

mostly empty space and has a small,
positively charged nucleus

Answer

a hard sphere and has a large, negatively
charged nucleus

Answer

mostly empty space and has a small,
negatively charged nucleus

Answer

a hard sphere and has a large, positively
charged nucleus

Question 36

Atoms are neutral because the number of

Accepted Answer

protons equals the number of electrons

Answer

protons equals the number of neutrons

Answer

neutrons is greater than the number of
electrons

Answer

neutrons is greater than the number of
protons

Question 37

In the ground state, valence electrons of a
krypton atom are found in

Accepted Answer

the outermost shell

Answer

both the first shell and the outermost shell

Answer

both the nucleus and the first shell

Answer

the first shell

Question 38

According to the wave-mechanical model of the
atom, electrons are located in

Accepted Answer

orbitals

Answer

circular paths

Answer

a hard, indivisible sphere

Answer

a small, dense nucleus

Question 39

Which electron configuration represents the
electrons in an atom of sodium in the ground
state at STP?

Accepted Answer

$2-8-1$

Answer

$2-8-6$

Answer

$2-7-7$

Answer

$2-7-2$

Question 40

The elements on the Periodic Table of the
Elements are arranged in order of increasing

Accepted Answer

atomic number

Answer

mass number

Answer

number of valence electrons

Answer

number of neutrons

Question 41

Which element is malleable at STP?

Accepted Answer

copper

Answer

helium

Answer

sulfur

Answer

chlorine

Question 42

At $298\,{	ext K}$ and $1$ atm, which noble gas has the
lowest density?

Accepted Answer

$\,	ext{Ne}$

Answer

$\,	ext{Rn}$

Answer

$\,	ext{Xe}$

Answer

$\,	ext{Kr}$

Question 43

Which two terms represent types of chemical
formulas?

Accepted Answer

empirical and molecular

Answer

synthesis and decomposition

Answer

saturated and concentrated

Answer

polar and nonpolar

Question 44

Which quantities are conserved in all chemical
reactions?

Accepted Answer

charge, mass, and energy

Answer

volume, mass, and pressure

Answer

charge, pressure, and energy

Answer

volume, pressure, and energy

Question 45

Which term represents the sum of the atomic
masses of the atoms in a molecule?

Accepted Answer

formula mass

Answer

percent composition by mass

Answer

atomic number

Answer

mass number

Question 46

Which substance can not be decomposed by
chemical means?

Accepted Answer

$	ext{C}$

Answer

$	ext{C}_3	ext{O}_2$

Answer

$	ext{CO}$

Answer

$	ext{CO}_2$

Question 47

A beaker contains a dilute sodium chloride
solution at 1 atmosphere. What happens to the
number of solute particles in the solution and
the boiling point of the solution, as more sodium
chloride is dissolved?

Accepted Answer

The number of solute particles increases,
and the boiling point increases

Answer

The number of solute particles increases,
and the boiling point decreases.

Answer

The number of solute particles decreases,
and the boiling point increases

Answer

The number of solute particles decreases,
and the boiling point decreases.

Question 48

At STP, which gas sample has the same number
of molecules as $2.0\,	ext {liters}$ of $	ext{CH}_4(	ext{g})$ at STP?

Accepted Answer

$2.0\,	ext {liters}$ of $	ext{O}_2(	ext{g})$

Answer

$5.0\,	ext {liters}$ of $	ext{N}_2(	ext{g})$

Answer

$1.0\,	ext {liters}$ of $	ext{C}_2	ext{H}_6(	ext{g})$

Answer

$6.0\,	ext {liters}$ of $	ext{CO}_2(	ext{g})$

Question 49

Which term identifies a factor that will shift a
chemical equilibrium?

Accepted Answer

temperature

Answer

atomic radius

Answer

decay mode

Answer

catalyst

Question 50

According to which theory or law is a chemical
reaction most likely to occur when two particles
with the proper energy and orientation interact
with each other?

Accepted Answer

collision theory

Answer

atomic theory

Answer

law of conservation of matter

Answer

combined gas law

Question 51

Addition of a catalyst can speed up a reaction by
providing an alternate reaction pathway that
has a

Accepted Answer

lower activation energy

Answer

higher activation energy

Answer

lower heat of reaction

Answer

higher heat of reaction

Question 52

Which compound is saturated?

Accepted Answer

butane

Answer

pentyne

Answer

heptene

Answer

ethene

Question 53

An alcohol and an ether have the same molecular
formula, $	ext{C}_2	ext{H}_6	ext{O}$. These two compounds have

Accepted Answer

different functional groups and different
physical and chemical properties

Answer

the same functional group and different
physical and chemical properties

Answer

the same functional group and the same
physical and chemical properties

Answer

different functional groups and the same
physical and chemical properties

Question 54

Which metal is most easily oxidized?

Accepted Answer

$	ext{Mg}$

Answer

$	ext{Ag}$

Answer

$	ext{Co}$

Answer

$	ext{Cu}$

Question 55

Which substance is an Arrhenius acid?

Accepted Answer

$	ext{HCI}$

Answer

$	ext{KCI}$

Answer

$	ext{NH}_3$

Answer

$	ext{H}_2$

Question 56

Which statement describes an electrolyte?

Accepted Answer

When an electrolyte dissolves in water, the
resulting solution conducts an electric
current.

Answer

An electrolyte conducts an electric current
as a solid and does not dissolve in water

Answer

An electrolyte conducts an electric current
as a solid and dissolves in water

Answer

When an electrolyte dissolves in water, the
resulting solution does not conduct an
electric current.

Question 57

Which type of reaction occurs when an
Arrhenius acid reacts with an Arrhenius base to
form a salt and water?

Accepted Answer

neutralization

Answer

decomposition

Answer

combustion

Answer

saponification

Question 58

The three nuclides, U-233, U-235, and U-238, are isotopes of uranium because they have the same
number of protons per atom and

Accepted Answer

a different number of neutrons per atom

Answer

the same number of electrons per atom

Answer

a different number of electrons per atom

Answer

the same number of neutrons per atom

Question 59

Given the equation representing a chemical reaction:
$	ext{NaCl}(	ext{aq})+	ext {AgNO}_3(	ext{aq})ightarrow 	ext{NaNO}_3(	ext{aq})+ 	ext {AgCl}(	ext{s})$
This reaction is classified as a

Accepted Answer

double replacement reaction

Answer

decomposition reaction

Answer

synthesis reaction

Answer

single replacement reaction

Question 60

What is the formula for iron$(	ext{II})$ oxide?

Accepted Answer

$	ext{FeO}$

Answer

$	ext{Fe}_2	ext{O}$

Answer

$	ext{FeO}_2$

Answer

$	ext{Fe}_2	ext{O}_3$

Question 61

Given the reaction:
$2	ext{KClO}_3(	ext{s})ightarrow	ext{2KCl}(	ext{s})+ 	ext {3O}_2(	ext{g})$
How many moles of $	ext{KClO}_3$ must completely
react to produce $6\,	ext{moles}$ of $	ext{O}_2?$

Accepted Answer

$4\,	ext{moles}$

Answer

$2\,	ext{moles}$

Answer

$1\,	ext{moles}$

Answer

$6\,	ext{moles}$

Question 62

What is the number of moles of $	ext{CO}_2$ in
a $	ext{220.-gram}$ sample of $	ext{CO}_2 (	ext{gram-formula
mass  44 g/mol})?$

Accepted Answer

$5.0\,	ext{mol}$

Answer

$15\,	ext{mol}$

Answer

$44\,	ext{mol}$

Answer

$0.20\,	ext{mol}$

Question 63

A solution contains $	ext{25 grams of KNO}_3$ dissolved
in $	ext{200. grams of H2O.}$ Which numerical setup
can be used to calculate the percent by mass of
$	ext{KNO}_3$ in this solution?

Accepted Answer

$\frac{25\,	ext g}{225\,	ext g}	imes 100$

Answer

$\frac{25\,	ext g}{200.\,	ext g}	imes 100$

Answer

$\frac{200.\,	ext g}{225\,	ext g}	imes 100$

Answer

$\frac{25\,	ext g}{175\,	ext g}	imes 100$

Question 64

What is the molarity of $	ext{0.50 liter}$ of an aqueous
solution that contains $	ext{0.20 mole of NaOH
(gram-formula mass = 40. g/mol)}?$

Accepted Answer

$	ext{0.40 M}$

Answer

$	ext{0.10 M}$

Answer

$	ext{2.5 M}$

Answer

$	ext{0.20 M}$

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