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WorksheetsCollege Chem - Ultimate review
Total questions: 55
Worksheet time: 28mins
The two most important properties of all matter are
the ability to carry an electric current well and to hold electric charge.
taking up space and having mass.
being brittle and hard.
being malleable and ductile.
An atom is
the smallest unit of matter that maintains its chemical identity.
the smallest unit of a compound.
always made of carbon.
smaller than an electron.
Noble gases are in Group 18, and are best known because they are
unreactive.
excellent conductors.
rare.
lanthanides.
Which of these symbols represents a unit of volume?
mL
mg
mm
cm
In oxides of nitrogen, such as N₂O, NO, NO₂, and N₂O₃, atoms combine in small whole-number ratios. This evidence supports the law of
conservation of mass.
multiple proportions.
definite composition.
mass action.
Experiments with cathode rays led to the discovery of the
proton.
nucleus.
neutron.
electron.
An atom is electrically neutral because
neutrons balance the protons and electrons.
nuclear forces stabilize the charges.
the numbers of protons and electrons are equal.
the numbers of protons and neutrons are equal.
According to Bohr, electrons cannot reside at ____ in the figure below.
point A
point B
point C
point D
How many quantum numbers are needed to describe the energy state of an electron in an atom?
1
2
3
4
The p orbitals are shaped like
electrons.
circles.
dumbbells.
spheres.
What is the electron configuration for nitrogen, atomic number 7?
1s² 2s² 2p³
1s² 2s² 2p²
1s² 2s² 2p¹
1s² 2p² 2p³ 3s¹
In Group 2 elements, the valence electrons are in sublevel
d.
p.
s.
f.
The electrons involved in the formation of a chemical bond are called
dipoles.
s electrons.
Lewis electrons.
valence electrons.
How many atoms of fluorine are present in a molecule of carbon tetrafluoride, CF₄?
1
2
4
5
What is the empirical formula for a compound that is 36.1% Ca and 63.9% Cl?
CaCl
Ca₂Cl
CaCl₂
Ca₂Cl₂
How would oxygen be represented in the formula equation for the reaction of methane and oxygen to yield carbon dioxide and water?
oxygen
O
O₂
O₃
In an equation, the symbol for a substance in water solution is followed by
(l).
(g).
(aq).
(s).
Which equation is not balanced?
2H₂ + O₂ → 2H₂O
4H₂ + 2O₂ → 4H₂O
H₂ + H₂ + O₂ → H₂O + H₂O
2H₂ + O₂ → H₂O
What is the balanced equation when aluminum reacts with copper(II) sulfate?
Al + Cu₂S → Al₂S₃ + Cu
2Al + 3CuSO₄ → Al₂(SO₄)₃ + 3Cu
Al + CuSO₄ → AlSO₄ + Cu
2Al + Cu₂SO₄ → Al₂SO₄ + 2Cu
In the reaction represented by the equation N₂ + 3H₂ → 2NH₃, what is the mole ratio of hydrogen to ammonia?
1:1
2:1
3:2
6:8
The electron notation for aluminum (atomic number 13) is
1s² 2s² 2p⁶ 3s² 3p³ 3d¹
1s² 2s² 2p⁶ 3s² 2d¹
1s² 2s² 2p⁶ 3s² 3p¹
1s² 2s² 2p⁶
Organic chemistry is the study of
properties, changes, and relationships between energy and matter.
the chemistry of living things.
crystals and minerals.
carbon-containing compounds.
Matter includes all of the following except
air.
light.
smoke.
water vapor.
The vertical columns on the periodic table are called
periods.
rows.
groups.
elements.
The SI base unit for length is the
meter.
millimeter.
centimeter.
kilometer.
A sample of gold has a mass of 96.5 g and a volume of 5.00 cm³. The density of gold is
0.0518 g/cm³.
19.3 g/cm³.
101.5 g/cm³.
483 g/cm³.
The measurement 0.020 L is the same as
2.0 x 10⁻³ L.
2.0 x 10² L.
2.0 x 10⁻² L.
2.0 x 10⁻¹ L.
Because most particles fired at metal foil passed straight through, Rutherford concluded that
atoms were mostly empty space.
atoms contained no charged particles.
electrons formed the nucleus.
atoms were indivisible.
How many moles of atoms are in 50.15 g of mercury (atomic mass 200.59 amu)?
0.1001 mol
0.1504 mol
0.2500 mol
0.4000 mol
The distance between two successive peaks on adjacent waves is its
frequency.
wavelength.
quantum number.
velocity.
Which model of the atom explains the orbitals of electrons as waves?
the Bohr model
the quantum model
Rutherford's model
Planck's theory
Mendeleev left spaces in his periodic table and predicted the existence of three elements and their
atomic numbers.
colors.
properties.
radioactivity.
Argon, krypton, and xenon are
alkaline earth metals.
noble gases.
actinides.
lanthanides.
The atomic number of lithium, the first element in Group 1, is 3. The atomic number of the second element in this group is
4.
10.
11.
18.
Calcium, atomic number 20, has the electron configuration [Ar] 4s². In what period is calcium?
Period 2
Period 4
Period 8
Period 20
Hydrogen is placed separately from other elements in the periodic table because it
is a gas.
does not exist as a free element in nature.
has atomic number one.
has many unique properties.
Compared to the alkali metals, the alkaline-earth metals
are less reactive.
have lower melting points.
are less dense.
combine more readily with nonmetals.
When atoms share electrons, the electrical attraction of an atom for the shared electrons is called the atom's
electron affinity.
electronegativity.
resonance.
hybridization.
What are shared in a covalent bond?
ions
Lewis structures
electrons
dipoles
Nonpolar covalent bonds are not common because
one atom usually attracts electrons more strongly than the other.
ions always form when atoms join.
the electrons usually remain equally distant from both atoms.
dipoles are rare in nature.
What group of elements satisfies the octet rule without forming compounds?
halogen
noble gas
alkali metal
alkaline-earth metal
Use VSEPR theory to predict the shape of the hydrogen chloride molecule, HCl.
tetrahedral
linear
bent
trigonal-planar
What is the formula for the compound formed by calcium ions and chloride ions?
CaCl
Ca2Cl
CaCl3
CaCl2
What is the formula for aluminum sulfate?
AlSO4
Al2(SO4)3
Al2(SO3)3
Al(SO4)3
Name the compound Zn3(PO4)2.
zinc potassium oxide
silicon oxide
zinc phosphate
zinc phosphite
Name the compound SiO2.
silver oxide
silicon oxide
silicon dioxide
moonsilver dioxide
Which coefficients correctly balance the formula equation NH4NO2(s) → N2(g) + H2O(l)?
1, 2, 2
1, 1, 2
2, 1, 1
2, 2, 2
In what kind of reaction does one element replace a similar element in a compound?
displacement reaction
combustion
decomposition reaction
ionic reaction
The reaction represented by the equation 2KClO3(s) → 2KCl(s) + 3O2(g) is a(n)
synthesis reaction.
decomposition reaction.
combustion reaction.
ionic reaction.
For the reaction represented by the equation C + 2H₂ → CH₄, how many moles of hydrogen are required to produce 10 mol of methane, CH₄?
2 mol
4 mol
10 mol
20 mol
What is the chemical symbol for the element with atomic number 6?
C
H
O
N
Which of the following is a noble gas?
Oxygen
Helium
Nitrogen
Hydrogen
What is the molar mass of water, H₂O?
22.02 g/mol
16.00 g/mol
20.02 g/mol
18.02 g/mol
What is the charge of an electron?
Variable
Neutral
Negative
Positive
What is the primary factor that determines the chemical properties of an element?
Number of protons
Number of neutrons
Number of electrons
Atomic mass
