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- 1. Multiple Choice
Which statement describes the earliest model of the atom?
An atom is an indivisible hard sphere.
An atom has a small, dense nucleus.
Electrons are negative particles in an atom.
Electrons in an atom have wave-like properties.
- 2. Multiple Choice
In all atoms of bismuth, the number of electrons must equal the
number of protons
number of neutrons
sum of the number of neutrons and protons
difference between the number of neutrons and protons
- 3. Multiple Choice
Which symbol represents a particle that has a mass approximately equal to the mass of a neutron?
α
+
-
p
- 4. Multiple Choice
An orbital is a region in an atom where there is a high probability of finding
an alpha particle
an electron
a neutron
a positron
- 5. Multiple Choice
Which electron shell in an atom of calcium in the ground state has an electron with the greatest amount of energy?
1
2
3
4
- 6. Multiple Choice
As the elements in Period 2 are considered in order from lithium to fluorine, there is an increase in the
atomic radius
electronegativity
number of electron shells
number of electrons in the first shell
- 7. Multiple Choice
Which element is classified as a metalloid?
boron
sulfur
potassium
xenon
- 8. Multiple Choice
Strontium and barium have similar chemical properties because atoms of these elements have the same number of
protons
neutrons
electron shells
valence electrons
- 9. Multiple Choice
Which element has metallic bonds at room temperature?
bromine
cesium
krypton
sulfur
- 10. Multiple Choice
What is the number of electrons shared between the atoms in a molecule of nitrogen, N2?
8
2
3
6
- 11. Multiple Choice
Given the equation representing a reaction: H + H → H2
What occurs during this reaction?
A bond is broken and energy is absorbed.
A bond is broken and energy is released.
A bond is formed and energy is absorbed.
A bond is formed and energy is released
- 12. Multiple Choice
An atom of which element has the strongest attraction for electrons in a chemical bond?
chlorine
carbon
phosphorus
sulfur
- 13. Multiple Choice
Which statement describes a mixture of sand and water at room temperature?
It is heterogeneous, and its components are in the same phase.
It is heterogeneous, and its components are in different phases.
It is homogeneous, and its components are in the same phase.
It is homogeneous, and its components are in different phases.
- 14. Multiple Choice
According to the kinetic molecular theory, which statement describes the particles in a sample of an ideal gas?
The particles are constantly moving in circular paths.
The particles collide, decreasing the total energy of the system.
The particles have attractive forces between them.
The particles are considered to have negligible volume.
- 15. Multiple Choice
Which sample of matter has the greatest distance between molecules at STP?
N2(g)
C6H14(l)
NH3(aq)
C6H12O6(s)
- 16. Multiple Choice
Which electron configuration represents the electrons in an atom of sulfur in an excited state?
2 – 8 – 6
2 – 7 – 7
2 – 8 – 7
2 – 7 – 8
- 17. Multiple Choice
Which notations represent atoms that have the same number of protons but a different number of neutrons?
H-3 and He-3
S-32 and S-32
Cl-35 and Cl-37
Ga-70 and Ge-73
- 18. Multiple Choice
Which compound has covalent bonds?
H2O
Li2O
Na2O
K2O
- 19. Multiple Choice
At which temperature and pressure will a sample of neon gas behave most like an ideal gas?
300. K and 2.0 atm
300. K and 4.0 atm
500. K and 2.0 atm
500. K and 4.0 atm
- 20. Multiple Choice
The volumes of four samples of gaseous compounds at 298 K and 101.3 kPa are shown in the table below.
Sample Compounds Volume (L)
1 NH3(g) 44.0
2 CO2(g) 33.0
3 HF(g) 44.0
4 CH4(g) 22.0
Which two samples contain the same number of molecules?
1 and 2
1 and 3
2 and 3
2 and 4
- 21. Multiple Choice
Graphite and diamond are two forms of solid carbon at STP. These forms have
different molecular structures and different properties
different molecular structures and the same properties
the same molecular structures and different properties
the same molecular structures and the same properties
- 22. Multiple Choice
In the ground state, an atom of which element has seven valence electrons?
sodium
phosphorus
nitrogen
fluorine
- 23. Multiple Choice
Which information is sufficient to differentiate a sample of sodium from a sample of silver?
the mass of each sample
the volume of each sample
the reactivity of each sample with water
the phase of each sample at room temperature
- 24. Multiple Choice
Which statement explains why NaBr is classified as a compound?
Na and Br are chemically combined in a fixed proportion.
Na and Br are both nonmetals.
NaBr is a solid at 298 K and standard pressure.
NaBr dissolves in H2O at 298 K.
- 25. Multiple Choice
Which substance can not be broken down by a chemical change?
ammonia
magnesium
methane
water
- 26. Multiple Choice
The degree of polarity of a covalent bond between two atoms is determined by calculating the difference in their
atomic radii
melting points
electronegativities
ionization energies
- 27. Multiple Choice
At STP, which property of a molecular substance is determined by the arrangement of its molecules?
half-life
molar mass
physical state
percent composition
- 28. Multiple Choice
Which ion in the ground state has the same electron configuration as an atom of neon in the ground state?
Ca2+
Cl-
Li+
O2-
- 29. Multiple Choice
The molar masses and boiling points at standard pressure for four compounds are given in the table below.
Which compound has the strongest intermolecular forces?
HF
HCl
HBr
HI
- 30. Multiple Choice
Which particle model diagram represents xenon at STP?
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