WorksheetsBenchmark 2 review
Total questions: 25
Worksheet time: 31mins
Using a periodic table, what is the average
atomic mass of cobalt (Co)?
40.08
52.00
58.93
65.55
What is the charge of an electron?
-2
0
+1
-1
Due to the number of valence electrons, which
type of atom would a Group 1 element bond with
in a 1:1 ratio?
Argon
Oxygen
Carbon
Chlorine
What leads to the formation of a covalent bond?
sharing electrons between a metal and non metal
sharing electrons between 2 metals
transfer of electrons between 2 non metals
sharing of electrons between 2 non metals
Which best describes a stable binary ionic
compound?
two ions with the same charges and a net
charge of negative one (-1)
two ions with opposite charges and a net charge
of positive one (+1)
two ions with the same charges and a net
charge of zero (0)
two ions with opposite charges and a net charge
of zero (0)
What is the formula for the compound formed
when aluminum ions (Al3+) and chloride ions (Cl-)
unite?
AlCl
Al2Cl
AlCl2
AlCl3
What is the chemical name for NO2?
nitrogen pentoxide
nitrogen dioxide
nitrogen trioxide
nitrogen oxide
In a chemical reaction, how does the total mass
of the products compare to the total mass of the
reactants?
They are always equal.
The reactants are always smaller
The reactants are always larger
They are never equal.
H2SO4 + Ca --> CaSO4 + H2
This is a ______________________reaction.
double replacement
synthesis
decomposition
single replacement
Look at the following chemical equation.
2H2O2 → 2H2O + O2
Does this equation follow the conservation of
mass?
Yes
No
Which of the following is a balanced equation?
Na2S + 2KCl → 2NaCl + K2S
LiCl + 2H2O → 2HCl + Li2O
2KBr + 2CaO → K2O + CaBr2
NaCl + H2O → NaO + 2HCl
Look at the following equation.
__NaCl + __CaF2 → __NaF +__CaCl2
In order to follow the law of conservation of mass,
this equation must have which set of coefficients,
in order from left to right?
2 1 3 1
2 2 2 2
2 1 2 1
1 3 1 3
Which of the following describes a relationship
between an atomic property and nuclear power
generation?
Atoms such as the uranium-235 isotope absorb
energy when they are split into smaller atoms.
Atoms such as the uranium-235 isotope can
bond with other atoms to form larger molecules,
releasing energy in the process.
Atoms such as the uranium-235 isotope can
bond with other atoms to form larger molecules,
absorbing energy in the process.
Atoms such as the uranium-235 isotope release
energy when they are split into smaller atoms.
Which of the following BEST describes what
occurs in a fusion reaction?
Two low mass nuclei are joined to form one
nucleus and gives off energy.
A single nucleus divides into two or more nuclei
and gives off energy
Electrons are shared between the nuclei.
A chemical reaction occurs between the nuclei.
Which are nuclear reactions that produce energy
by either splitting a nucleus or joining nuclei?
fission and fusion
Chemical and fusion
electrical and mechanical
fission and electromagnetic
How many half-lives does it take for a radioactive
substance to decay until only one quarter of the
original substance remains?
1
2
3
4
In 2011, a 15-meter-tall tsunami caused by an
undersea earthquake seriously damaged a
nuclear power plant on the coast of Japan. What
pollutant resulted from the accident that is
harmful to organisms?
ozone depletion
acid rain
radiation
global warming
Which of the following lists of elements contains
a metal, a metalloid, a nonmetal, and a noble
gas?
Be, Si, Cl, Kr
C, N, Ne, Ar
K, Fe, B, F
Na, Zn, As, Sb
Which of the following do elements of the same
group have in common?
number of protons
number of valence electrons
number of neutrons
number of protons and neutrons
What is the sum of the charges in a compound?
0
+1
-1
+2
Which of the following compounds is composed
of more than two atoms?
calcium oxide
sodium chloride
potassium chloride
magnesium fluoride
Donald is heating up water on the stove in a tea
kettle.
Which of the following BEST describes the
process by which the water in the kettle moves
during the time it is being heated?
The water circulates in the tea kettle due to
convection, which is caused by the motion of
warm and cold fluids due to their different
densities.
The water circulates in the tea kettle due to
radiation, which is caused by energy being
absorbed by the tea kettle in contact with the
burner.
The water circulates in the tea kettle due to
conduction, which is caused by the warmer and
colder molecules mixing with each other.
The water circulates due to convection, which is
caused by molecules colliding with each other
and transferring energy from the colder
molecules to the warmer ones.
If a gas is at a constant temperature and the
pressure increases, what will happen to the
volume?
The volume will increase because it is directly
proportional to the pressure.
The volume will decrease because it is directly
proportional to the pressure.
The volume will increase because it is inversely
proportional to the pressure.
The volume will decrease because it is inversely
proportional to the pressure.
Nelson places a stainless steel spoon in a cup of
hot coffee, as shown in the picture.
How does the motion of the atoms in the spoon
change when the spoon is placed in the hot
coffee?
The atoms vibrate faster due to the conduction
of heat through atoms in the spoon.
The atoms vibrate slower due to the conduction
of heat through atoms in the spoon.
The atoms move closer toward each other due
to the radiation of heat through atoms in the
spoon.
The atoms move away from each other due to
the convection of heat through atoms in the
spoon.
Carol has an unknown element in group 17.
Using the periodic table, how many valence
electrons does her element have?
17
4
7
9
