Download Midterm Review.ppt - Chemistry R: 4(AE)

Midterm Review
Atomic Concepts- Purple
Periodic Table- Pink
Chemical Bonding- Yellow
Behavior of Matter- Blue
• You can only have out a: Periodic Table and a
Calculator
• The team that answers the most questions
correctly will receive bonus points
• NO Notes or Working with other groups!
• Compared to the charge and mass of a proton,
an electron has:
1. the same charge and a smaller mass
2. the same charge and the same mass
3. an opposite charge and a smaller mass
4. an opposite charge and the same mass
• When alpha particles are used to bombard
gold foil, most of the alpha particles pass
through undeflected. This result indicates that
most of the volume of a gold atom consists of
____.
1. deuterons
2. neutrons
3. protons
4. unoccupied space
• A proton has approximately the same mass as
1. a neutron
2. an alpha particle
3. a beta particle
4. an electron
• When electrons in an atom in an excited state
fall to lower energy levels, energy is
1. absorbed, only
2. released, only
3. neither released nor absorbed
4. both released and absorbed
• A neutron has approximately the same mass
as a
1. an alpha particle
2. a beta particle
3. an electron
4. a proton
• Which symbols represent atoms that are
isotopes?
1. C-14 and N-14
2. O-16 and O-18
3. I-131 and I-131
4. Rn-222 and Ra-222
• Which element's ionic radius is smaller than
its atomic radius?
1. neon
2. nitrogen
3. sodium
4. sulfur
• Which atom contains exactly 15 protons?
1. P-32
2. S-32
3. O-15
4. N-15
• An ion with 5 protons, 6 neutrons, and a
charge of 3+ has an atomic number of
1. 5
2. 6
3. 8
4. 11
• What is the mass number of an atom which
contains 28 protons, 28 electrons, and 34
neutrons?
1. 28
2. 56
3. 62
4. 90
• Which three groups of the Periodic Table
contain the most elements classified as
metalloids (semimetals)?
1. 1, 2, and 13
2. 2, 13, and 14
3. 14, 15, and 16
4. 16, 17, and 18
• Which element has the highest first ionization
energy?
1. sodium
2. aluminum
3. calcium
4. phosphorus
• Which compound forms a colored aqueous
solution?
1. CaCl2
2. CrCl3
3. NaOH
4. KBr
• When a metal atom combines with a
nonmetal atom, the nonmetal atom will
1. lose electrons and decrease in size
2. lose electrons and increase in size
3. gain electrons and decrease in size
4. gain electrons and increase in size
• According to Reference Table S, which of the
following elements has the smallest atomic
radius?
1. nickel
2. cobalt
3. calcium
4. potassium
• Which element in Group 15 has the strongest
metallic character?
1. Bi
2. As
3. P
4. N
• Which halogens are gases at STP?
1. chlorine and fluorine
2. chlorine and bromine
3. iodine and fluorine
4. iodine and bromine
• When combining with nonmetallic atoms,
metallic atoms generally will
1. lose electrons and form negative ions
2. lose electrons and form positive ions
3. gain electrons and from negative ions
4. gain electrons and form positive ions
• Which set of elements contains a metalloid?
1. K, Mn, As, Ar
2. Li, Mg, Ca, Kr
3. Ba, Ag, Sn, Xe
4. Fr, F, O, Rn
• Atoms of elements in a group on the Periodic
Table have similar chemical properties. This
similarity is most closely related to the atoms‘
1. number of principal energy levels
2. number of valence electrons
3. atomic numbers
4. atomic masses
• As atoms of elements in Group 16 are
considered in order from top to bottom, the
electronegativity of each successive element
1. decreases
2. increases
3. remains the same
• The first ionization energy of an element is
736 kJ per mole of atoms. An atom of this
element in the ground state has a total of how
many valence electrons?
1. 1
2. 2
3. 3
4. 4
• An atom of which of the following elements
has the greatest ability to attract electrons?
1. silicon
2. sulfur
3. nitrogen
4. chlorine
• At STP, which substance is the best conductor
of electricity?
1. nitrogen
2. neon
3. sulfur
4. silver
• Which metal is obtained commercially by the
electrolysis of salt?
1. Zn
2. K
3. Fe
4. Ag
• Which element can be found in nature in the
free (uncombined) state?
1. Ca
2. Ba
3. Au
4. Al
• Which formula represents a molecular
substance?
1. CaO
2. CO
3. Li2O
4. Al2O3
• Which sequence of Group 18 elements
demonstrates a gradual decrease in the
strength of the Van der Waals forces? All the
choices are elements in the liquid state.
1. Ar, Kr, Ne, Xe
2. Kr, Xe, Ar, Ne
3. Ne, Ar, Kr, Xe
4. Xe, Kr, Ar, Ne
• Which substance is an example of a network
solid?
1. nitrogen dioxide
2. sulfur dioxide
3. carbon dioxide
4. silicon dioxide
• Which combination of atoms can form a polar
covalent bond?
1. H and H
2. H and Br
3. N and N
4. Na and Br
• A strontium atom differs from a strontium ion
in that the atom has a greater
1. number of electrons
2. number of protons
3. atomic number
4. mass number
• Which bond has the greatest ionic character?
1. H---Cl
2. H---F
3. H---O
4. H---N
• Which gas is monatomic at STP?
1. chlorine
2. fluorine
3. neon
4. nitrogen
• What Kelvin temperature is equal to 25°C?
1. 248 K
2. 298 K
3. 100 K
4. 200 K
• As ice cools from 273 K to 263 K, the average
kinetic energy of its molecules will
1. decrease
2. increase
3. remain the same
• The phase change represented by the
equation I2 (s) ----> I2 (g) is called
1. sublimation
2. condensation
3. melting
4. boiling
• What is the total number of joules of heat
energy absorbed by 15 grams of water when it
is heated from 30°C to 40°C?
1. 10
2. 63
3. 150
4. 630
• A compound differs from a mixture in that a
compound always has a
1. homogeneous composition
2. maximum of two components
3. minimum of three components
4. heterogeneous composition
• Which substance cannot be decomposed into
simpler substances?
1. ammonia
2. aluminum
3. methane
4. methanol
• How many joules are equivalent to 35
kilojoules?
1. 0.035 joules
2. 0.35 joules
3. 3,500 joules
4. 35,000 joules
• Which statement describes a chemical
property?
1. Its crystals are a metallic gray.
2. It dissolves in alcohol.
3. It forms a violet-colored gas.
4. It reacts with hydrogen to form a gas.
• Which measurement contains three significant
figures?
1. 0.08 cm
2. 0.080 cm
3. 800 cm
4. 8.08 cm
• A student investigated the physical and
chemical properties of a sample of unknown
gas and then investigated the gas. Which
statement represents a conclusion rather than
an experimental observation?
1. The gas is colorless.
2. The gas is carbon dioxide.
3. When the gas is bubbled in limewater, the
liquid becomes cloudy.
4. When placed in the gas, a flaming splint
stops burning.
• A student determined the heat of fusion of
water to be 366.9 J/g. If the accepted value is
333.3J/g, what is the student's percent error?
1. 8.0%
2. 10.0%
3. 15%
4. 30.0%
• In an experiment, a student found 18.6% by
mass of water in a sample of BaCl2 * 2H2O.
The accepted value is 14.8%. What was the
student's experimental percent error?
1. 3.8 / 18.6 x 100
2. 3.8 / 14. 8 x 100
3. 14.8 / 18.6 x 100
4. 18.6 / 14.8 x 100
• What is the sum of
6.6412 g + 12.85 + 0.046 g + 3.48 g
Expressed to the correct number of significant
figures?
1. 23 g
2. 23.0 g
3. 23.017 g
4. 23.02 g