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- 1. Multiple Choice
Allotrope
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
- 2. Multiple Choice
Which particle remains undeflected when
passing through this electric field?
Proton
Neutron
Electron
Positron
- 3. Multiple Choice
The mass of an electron is
equal to the mass of a proton
equal to the mass of a neutron
greater than the mass of a proton
less than the mass of a neutron
- 4. Multiple Choice
Which statement explains why NaBr is classified
as a compound?
(1)
(2)
(3)
(4)
NaBr dissolves in H2O at 298 K.
Na and Br are both nonmetals.
NaBr is a solid at 298 K and standard pressure.
Na and Br are chemically combined in a fixed proportion.
- 5. Multiple Choice
During all chemical reactions, charge, mass and
energy are
conserved
decomposed
decayed
condensed
- 6. Multiple Choice
The degree of polarity of a covalent bond
between two atoms is determined by calculating
the difference in their
melting points
atomic radii
ionization energies
electronegativities
- 7. Multiple Choice
Which statement describes the components of a
mixture?
The proportions of components can vary.
Each component loses its original properties.
Each component gains new properties.
The proportions of components cannot vary.
- 8. Multiple Choice
Table sugar can be separated from a mixture of
table sugar and sand at STP by adding
water, stirring, and distilling at 100.°C
sand, stirring, and filtering
water, stirring, and filtering
sand, stirring, and distilling at 100.°C
- 9. Multiple Choice
When an F atom becomes an F ion, the F atom
gains a proton
loses an electron
gains an electron
loses a proton
- 10. Multiple Choice
Which electron configuration represents an atom of chlorine in an excited state?
2-8-7-2
2-8-8
2-7-8
2-8-7
- 11. Multiple Choice
Magnesium and calcium have similar chemical
properties because their atoms in the ground
state have
two electrons in the outermost shell
two electrons in the first shell
equal numbers of protons and electrons
equal numbers of protons and neutrons
- 12. Multiple Choice
Which phrase describes the charge and mass of
a neutron?
no charge and an approximate mass of 1 u
no charge and no mass
a charge of +1 and an approximate mass of 1 u
a charge of -1 and no mass
- 13. Multiple Choice
What is the number of electrons in a potassium
atom?
39
20
19
18
- 14. Multiple Choice
The nuclides I-131 and I-133 are classified as
(1)
(2)
(3)
(4)
isotopes of Xe-131 and Cs-133
isotopes of the same element
isomers of Xe-131 and Cs-133
isomers of the same element
- 15. Multiple Choice
Which statement explains why water is classified
as a compound?
Water is a poor conductor of electricity.
Water has a heat of fusion of 334 J/g.
Water is a liquid at room temperature.
Water can be broken down by chemical means.
- 16. Multiple Choice
Which compound contains both ionic and covalent
bonds?
NaCN
CH2Br2
CaCl2
KI
- 17. Multiple Choice
The elements on the Periodic Table are
arranged in order of increasing
number of valence electrons
number of isotopes
atomic number
mass number
- 18. Multiple Choice
Given the balanced equation representing a
reaction:
H2 → H + H
What occurs during this reaction?
Energy is released as bonds are broken.
Energy is released as bonds are formed.
Energy is absorbed as bonds are broken.
Energy is absorbed as bonds are formed.
- 19. Multiple Choice
Given the balanced equation representing a
reaction occurring at 101.3 kilopascals and 298 K:
2H2(g) + O2(g) → 2H2O(ℓ) + energy
What is the net amount of energy released when
one mole of H2O(ℓ) is produced?
285.8 kJ
483.6 kJ
571.6 kJ
241.8 kJ
- 20. Multiple Choice
Element X reacts with copper to form the
compounds CuX and CuX2. In which group on
the Periodic Table is element X found?
Group 17
Group 13
Group 2
Group 1
- 21. Multiple Choice
Which compound has the strongest hydrogen
bonding at STP?
(1) (3)
(2) (4)
H2Te
H2Se
H2S
H2O
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