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1. Two hydrogen atoms form a hydrogen molecule when
A)
B)
C)
D)
one atom loses a valence electron to the other atom
one atom shares four electrons with the other atom
the two atoms collide and both atoms gain energy
the two atoms collide with sufficient energy to
form a bond
2. Which statement describes a chemical change?
A)
B)
C)
D)
Alcohol evaporates.
Water vapor forms snowflakes.
Table salt (NaCl) is crushed into powder.
Glucose (C 6H 12O 6) and oxygen produce CO 2
and H2O.
3. Given the balanced equation representing a reaction:
H2(g) + Cl2(g)
2HCl(g) + energy
Which statement describes the energy changes in this
reaction?
A) Energy is absorbed as bonds are formed, only.
B) Energy is released as bonds are broken, only.
C) Energy is absorbed as bonds are broken, and
energy is released as bonds are formed.
D) Energy is absorbed as bonds are formed, and energy
is released as bonds are broken.
4. What occurs in order to break the bond in a Cl2
molecule?
A)
B)
C)
D)
Energy is absorbed.
Energy is released.
The molecule creates energy.
The molecule destroys energy.
5. What occurs as two atoms of fluorine combine to
become a molecule of fluorine?
A)
B)
C)
D)
A bond is formed as energy is absorbed.
A bond is formed as energy is released.
A bond is broken as energy is absorbed.
A bond is broken as energy is released.
6. Base your answer to the following question on
your knowledge of chemical bonding and on the Lewis
electron-dot diagrams of H2S, CO 2, and F 2 below.
Which atom, when bonded as shown, has the same
electron configuration as an atom of argon?
7. Which of these elements has an atom with the most
stable outer electron configuration?
A) Ne
B) Cl
C) Ca
D) Na
8. Which electron-dot diagram represents H2?
A)
B)
C)
D)
9. Which atom has the least attraction for the electrons in a
bond between that atom and an atom of hydrogen?
A) carbon
C) oxygen
B) nitrogen
D) fluorine
10. Which compound has the least ionic character?
A) KCl
B) CaCl2 C) AlCl 3 D) CCl4
11. Given the electron dot formula:
Which atom represented as X would have the least
attraction for the electrons that form the bond?
A) F
B) Cl
C) I
D) Br
12. Based on electronegativity values, which type of
elements tends to have the greatest attraction for
electrons in a bond?
A) metals
C) nonmetals
B) metalloids
D) noble gases
13. Which kind of compound generally results when
nonmetal atoms chemically combine with metal atoms?
A) hydrogen
C) covalent
B) ionic
D) metallic
14. As sodium reacts with fluorine to form the compound
NaF, each sodium atom will
A) gain 1 electron
C) lose 1 electron
B) gain 2 electrons
D) lose 2 electrons
15. Which formula represents an ionic compound?
A) H2
C) CH 3OH
B) CH 4
D) NH 4 Cl
16. Which formula correctly represents the compound
calcium hydroxide?
A) CaOH
C) CaOH2
B) Ca2OH
D) Ca(OH) 2
17. As NaC 2H3O2(s) is stirred into water and dissolves, the
electrical conductivity of the solution
A) decreases
C) remains the same
B) increases
18. A substance has a high melting point and conducts
electricity in the liquid phase. This substance is
A) Ne
B) Hg
C) NaCl D) SiC
19. Based on bond type, which compound has the highest
melting point?
A) CH 3OH
C) CaCl2
B) C6H14
D) CCl4
20. A substance that does not conduct electricity as a solid
but does conduct electricity when melted is most likely
classified as
A)
B)
C)
D)
an ionic compound
a molecular compound
a metal
a nonmetal
21. Which formula represents a compound that is formed
primarily by sharing electrons?
A) KCl
B) CaCl2 C) CrCl 3 D) CCl4
22. Which compound contains both ionic and covalent
bonds?
A) HCl(g)
C) NH 4Cl(s)
B) NaCl(s)
D) CCl4( )
23. Which formula represents a molecular solid?
A) NaCl(s)
C) Cu(s)
B) C6H 12O 6(s)
D) KF(s)
24. Multiple covalent bonds exist in a molecule of
A) F2
B) N2
C) Br 2
D) H2
25. Which characteristic is a property of molecular
substances?
A)
B)
C)
D)
good heat conductivity
good electrical conductivity
low melting point
high melting point
26. In which material are the particles arranged in a regular
geometric pattern?
A) CO 2(g)
C) H2O( )
B) NaCl(aq)
D) C12H 22O 11(s)
27. Which type of bond is formed when an ammonia
molecule accepts a proton?
A)
B)
C)
D)
ionic
electrovalent
coordinate covalent
metallic
28. What occurs when a coordinate covalent bond is
formed between nitrogen and hydrogen in the
ammonium ion, NH 4+ ?
A) Hydrogen provides a pair of electrons to be shared
with nitrogen.
B) Nitrogen provides a pair of electrons to be
shared with hydrogen.
C) Hydrogen transfers a pair of electrons to nitrogen.
D) Nitrogen transfers a pair of electrons to hydrogen.
29. Which type of bond would be formed when a hydrogen
ion (H + ) reacts with an ammonia molecule (NH3)?
A)
B)
C)
D)
a coordinate covalent bond
a nonpolar covalent bond
a metallic bond
an ionic bond
30. Which substance contains metallic bonds?
A) Hg( )
C) NaCl(s)
B) H2O( )
D) C6H12O6(s)
31. Which element has a crystalline lattice composed of
positive ions through which electrons flow freely?
A) bromine
C) carbon
B) calcium
D) sulfur
32. The high electrical conductivity of metals is primarily
due to
A)
B)
C)
D)
high ionization energies
filled energy levels
mobile electrons
high electronegativities
A)
33. Which is an example of a network solid?
A) SiC(s)
C) AgNO3(s)
B) CO 2(s)
D) Ag(s)
34. Which compound is a network solid?
A) SiO2 B) Na2O C) H2O
D) CO 2
35. Which compound is a poor conductor of heat and
electricity and has a high melting point?
A) SiO2 B) CO 2
C) H2O
D) N2O
36. Which combination of atoms can form a polar covalent
bond?
A) H and H
C) N and N
B) H and Br
D) Na and Br
37. Which type of bond is formed between the carbon atom
and the oxygen atom in CH 3OH?
A) ionic
C) polar covalent
40. Which structural formula represents a nonpolar
molecule?
B)
C)
D)
41. Which substance is correctly paired with its type of
bonding?
A)
B)
C)
D)
NaBr–nonpolar covalent
HCl–nonpolar covalent
NH 3–polar covalent
Br 2–polar covalent
42. Hexane (C6H14) and water do not form a solution.
Which statement explains this phenomenon?
A)
B)
C)
D)
Hexane is polar and water is nonpolar.
Hexane is ionic and water is polar.
Hexane is nonpolar and water is polar.
Hexane is nonpolar and water is ionic.
43. Which formula represents a polar molecule?
A) Br 2
B) CO 2
C) CH 4
D) NH 3
44. The diagram below represents a water molecule.
B) electrovalent
D) nonpolar covalent
38. In a nonpolar covalent bond, electrons are
A)
B)
C)
D)
shared equally by two atoms
shared unequally by two atoms
transferred from one atom to another
located in a mobile "sea" shared by many atoms
39. Given the formula:
This molecule is best described as
A)
B)
C)
D)
polar with polar covalent bonds
polar with nonpolar covalent bonds
nonpolar with polar covalent bonds
nonpolar with nonpolar covalent bonds
45. At STP, fluorine is a gas and iodine is a solid. This
observation can be explained by the fact that fluorine
has
The bond between which two atoms has the greatest
degree of polarity?
A) C and C
C) H and C
B) C and O
D) H and O
A) weaker intermolecular forces of attraction than
iodine
B) stronger intermolecular forces of attraction than
iodine
C) lower average kinetic energy than iodine
D) higher average kinetic energy than iodine
46. Which phrase describes a molecule of
, in terms of
molecular polarity and distribution of charge?
A) polar with an asymmetrical distribution of charge
B) polar with a symmetrical distribution of charge
C) nonpolar with an asymmetrical distribution of
charge
D) nonpolar with a symmetrical distribution of
charge