WorksheetsChemistry Exam
Total questions: 51
Worksheet time: 26mins
Element A and element B chemically combine to form substance C. Substance C must be
a solution
a compound
an element
a mixture
The formula H2 represents one
gram
atom
liter
molecule
Which statement describes a characteristic of all compounds?
Compounds contain one element, only.
Compounds contain two elements, only.
Compounds can be decomposed by chemical means.
Compounds can be decomposed by physical means.
A substance that is composed only of atoms having the same atomic number is classi ed as
a compound
an element
homogeneous mixture
heterogenous mixture
The
formula Al2S3 represents
an element
a binary compound
a teneaary compound
a mixture
Which species represents a chemical compound?
Chem 1 FALL Semester Exam 2022
N2
NH4+
NaHCO3
Na
Given the unbalanced equation:
C3H8(g) + O2(g) ! H2O(g) + CO2(g)
When the equation is completely balanced using smallest whole numbers, the coecient of O2 is
5
2
3
10
Given the unbalanced equation: Al2(SO4)3 + Ca(OH)2 ! Al(OH)3 + CaSO4
What is the coecient in front of the CaSO4 when the equation is completely balanced with the smallest whole-number coecients?
1
2
3
4
Given the unbalanced equation: Al+O2 !Al2O3
When this equation is completely balanced using smallest whole numbers, what is the sum of the coecients?
9
7
5
4
Given
When whole
the unbalanced equation: N2(g) + O2(g
1
2
4
5
What is conserved during a chemical reaction?
energy only
matter only
both matter and energy
neither
A binary compound of sodium is
sodium chlorate
sodium chlorite
sodium perchlorate
sodium chloride
Which formula represents lead (II) phosphate?
Pb3 (PO4 )2
Pb2 (PO4 )3
The correct name of the compound with the formula PbO2 IS
lead (IV) oxide
lead (II) oxide
Hydrogen bonds are strongest between molecules of
H2 O(l)
H2 S(l)
Which compound contains ionic bonds?
NaBr(s)
HBr(g)
Which element forms an ionic bond with
fluorine?
fluorine
potassium
oxygen
Which kind of bond is formed when two atoms share electrons to form a molecule?
ionic
metallic
covelant
The bonds present in silicon carbide (SiC) are
covelant
metallic
ionic
van der halls
When a reaction occurs between atoms with ground state electron con gurations 1s22s1 and 1s22s22p5 the predominant type of bond formed is
polar covelant
ionic
metallic
Which type of bond results when one or more valence electrons are transferred from one atom to another?
a hydrogen bond
an ionic bond
Magnesium nitrate contains chemical bonds that are
covalent, only
ionic, only
both covalent and ionic
The
bonds in BaO are best described as
covalent, because valence electrons are shared
covalent, because valence electrons are transferred
ionic, because valence electrons are shared
ionic, because valence electrons are transferred
The atomic number of an atom is always equal to the total number of
neutrons in the nucleus
protons in the nucleus
neutrons plus protons in the atom
All of the atoms of argon have the same
mass number
atomic number
Which is the atomic number of an atom with six valence electrons?
6
8
12
10
What is the atomic number of an element that has six protons and eight neutrons?
6
2
8
What is the mass number of an ion that consists of 20 protons, 20 neutrons, and 18 electrons?
18
20
38
40
What is the mass number of an atom which contains 21 electrons, 21 protons, and 24 neutrons?
21
42
45
66
The mass of a calcium atom is due primarily to the mass of its
protons, only
neutrons, only
protons and neutrons
An isotope of which element has an atomic number of 6 and a mass number of 14?
carbon
nitrogen
magnesium
Di erent isotopes of the same element must have a di erent
mass number
atomic number
number of protons
Which atom in the ground state has only one unpaired electron in its valence shell?
aluminum
phosphorus
sulfur
What is the total number of valence electrons in a germanium atom in the ground state?
22
2
32
4
The element in Period 3 that has the lowest rst ionization energy is
an alkali metal
an alkaline earth metal
a halogen
a noble gas
An aqueous solution of XCl2 contains colored 78. ions. Element X is most likely
an alkaline earth
a halogen
a transition metal
All the elements in Period 3 have the same 79. number of
occupied sublevels
principal energy levels
electrons
Which element in Period 3 exists as diatomic molecules at STP?
argon
chlorine
Which of these elements in Period 3 has the least tendency to attract electrons?
Mg
AL
S
Cl
Which element in Period 4 is classi ed as an active nonmetal?
Ga
Ge
Br
Kr
Which of the following electron con gurations represents the least active metal?
[Ne]3s2
[Ar]4s2
What is the total number of valence electrons in an atom of phosphorus in the ground state?
5
3
2
7
What is the total number of electrons found in the valence shell of a halogen in the the ground state?
1
2
7
8
Rubidium and cesium have similar chemical properties because, in the ground state, the atoms of both elements each have
one electron in the outermost shell
two electrons in the outermost shell
one neutron in the nucleus
If X represents an element of Group IA, the formula of its oxide would be
XO
X2O
XO2
When oxygen combines with any alkali metal, M, the formula of the compound produced usually is
M2O3
M2O
The amount of energy required to remove the most loosely bound electron from an atom in the gaseous phase is called
kinetic energy
potential energy
ionization energy
An element that has a high ionization energy and 94. tends to be chemically inactive would most likely be
an alkali metal
a transition element
a noble gas
a halogen
A characteristic of ionic solids is that they
have high melting points
have low boiling points
conduct electricity
are noncrystalline
Which principal energy level of an atom contains an electron with the lowest energy?
n=1
n=2
n=3
n=4
Which atom in the ground state has a partially filled second electron shell?
hydrogen atom
lithium atom
potassium atom
sodium atom
