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Transcript of < BackNext >PreviewMain Chemical Bonding Preview Chapter 13 CRCT Preparation.
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Chapter 13 CRCT Preparation
1. How many electrons are in the second energy level of the atom shown?
A 2
B 7
C 8
D 9
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Chapter 13 CRCT Preparation
1. How many electrons are in the second energy level of the atom shown?
A 2
B 7
C 8
D 9
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Chapter 13 CRCT Preparation
2. Which of the following statements about helium atoms is true?
A Helium atoms can never have a full set of valence electrons.
B Helium atoms need only 2 valence electrons to have a full outermost energy level.
C Helium atoms do not have valence electrons.
D Helium atoms have the same number of valence electrons as sulfur atoms do.
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Chapter 13 CRCT Preparation
2. Which of the following statements about helium atoms is true?
A Helium atoms can never have a full set of valence electrons.
B Helium atoms need only 2 valence electrons to have a full outermost energy level.
C Helium atoms do not have valence electrons.
D Helium atoms have the same number of valence electrons as sulfur atoms do.
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3. Sodium chloride, or table salt, forms when a chlorine atom takes an electron from a neighboring sodium atom. Which of the following describes the force that holds sodium chloride together?
A an ionic bond
B a hydrogen bond
C a metallic bond
D a covalent bond
Chapter 13 CRCT Preparation
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Chapter 13 CRCT Preparation
3. Sodium chloride, or table salt, forms when a chlorine atom takes an electron from a neighboring sodium atom. Which of the following describes the force that holds sodium chloride together?
A an ionic bond
B a hydrogen bond
C a metallic bond
D a covalent bond
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4. An aluminum ion has 13 protons, 14 neutrons, and 10 electrons. What is the charge of an aluminum ion?
A 10 –
B 3 –
C 1 +
D 3 +
Chapter 13 CRCT Preparation
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Chapter 13 CRCT Preparation
4. An aluminum ion has 13 protons, 14 neutrons, and 10 electrons. What is the charge of an aluminum ion?
A 10 –
B 3 –
C 1 +
D 3 +
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5. What property of copper allows copper wire to bend without breaking?
A Copper atoms have 29 protons.
B Copper is found in Group 11 on the periodic table.
C Copper atoms do not have a full outermost energy level.
D Copper atoms form metallic bonds with each other.
Chapter 13 CRCT Preparation
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Chapter 13 CRCT Preparation
5. What property of copper allows copper wire to bend without breaking?
A Copper atoms have 29 protons.
B Copper is found in Group 11 on the periodic table.
C Copper atoms do not have a full outermost energy level.
D Copper atoms form metallic bonds with each other.
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Chapter 13 CRCT Preparation
6. According to the electron-dot diagram of oxygen shown, how many more valence electrons does the oxygen atom need to fill its outermost energy level?
A 1
B 2
C 6
D 8
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Chapter 13 CRCT Preparation
6. According to the electron-dot diagram of oxygen shown, how many more valence electrons does the oxygen atom need to fill its outermost energy level?
A 1
B 2
C 6
D 8
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7. The ions that make up an ionic compound are bonded in a repeating three-dimensional pattern. What is this pattern called?
A chloride lattice
B covalent bond
C crystal lattice
D crystal pattern
Chapter 13 CRCT Preparation
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Chapter 13 CRCT Preparation
7. The ions that make up an ionic compound are bonded in a repeating three-dimensional pattern. What is this pattern called?
A chloride lattice
B covalent bond
C crystal lattice
D crystal pattern
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8. Which of the following forms when a neutral atom loses an electron?
A a negative atom
B a neutral ion
C a positive ion
D a negative ion
Chapter 13 CRCT Preparation
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Chapter 13 CRCT Preparation
8. Which of the following forms when a neutral atom loses an electron?
A a negative atom
B a neutral ion
C a positive ion
D a negative ion
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9. During a laboratory experiment at Georgia State University, Juanita observes a model of two bonded atoms. She is told that the atoms are both nonmetals. Which of the following is a valid conclusion?
A She is looking at a model of atoms held together by a covalent bond.
B She is looking at a model of atoms held together by an ionic bond.
C She is looking at a model of a metalloid.
D She is looking at a model of a crystal lattice.
Chapter 13 CRCT Preparation
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Chapter 13 CRCT Preparation
9. During a laboratory experiment at Georgia State University, Juanita observes a model of two bonded atoms. She is told that the atoms are both nonmetals. Which of the following is a valid conclusion?
A She is looking at a model of atoms held together by a covalent bond.
B She is looking at a model of atoms held together by an ionic bond.
C She is looking at a model of a metalloid.
D She is looking at a model of a crystal lattice.
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10. Which of an atom’s electrons are most likely to be involved in chemical bonding? Why?
Chapter 13 CRCT Preparation
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10. Answer - Full-credit answers should include the following points:
• The valence electrons are most likely to be involved in chemical bonding.
• When two atoms are close to each other, the outermost electrons of one atom are closest to the nucleus of the other atom.
• The attraction between the outermost electrons in one atom and the positively-charged nucleus of the other atom contributes to the bond between the two atoms.
• The outermost electrons are shared, lost, or gained most easily.
Chapter 13 CRCT Preparation
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11. Why do atoms of the noble gases, in Group 18 on the periodic table, usually not form chemical bonds?
Chapter 13 CRCT Preparation
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11. Answer - Full-credit answers should include the following points:
• The number of electrons in the outermost energy level of an atom determines whether an atom will form bonds.
• Atoms of the noble gases (Group 18) do not usually form chemical bonds because each atom has a full set of valence electrons.
• When the outermost energy level of an atom is full, the atom does not usually form bonds.
Chapter 13 CRCT Preparation