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Study Quiz 3
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1
Which of the following is true of the main group elements?
A)Electronegativity decreases across periods from left to right and increases down groups.
B)Electronegativity increases across periods from left to right and decreases down groups.
C)Electronegativity decreases across periods from left to right and decreases across groups.
D)Electronegativity increases across periods from left to right and increases down groups.
2
Which of the following is correct?
A)A fluorine atom has a higher electronegativity and is larger than a calcium atom.
B)A potassium atom has a higher electronegativity and is larger than a fluorine atom.
C)A fluorine atom has a higher electronegativity and is smaller than a calcium atom.
D)A potassium atom has a lower electronegativity than fluorine and is smaller than fluorine atom.
3
Which of the following statements is true?
A)Bonds with electronegativity differences of 1 are mostly ionic.
B)Bonds with electronegativity differences greater than 1.7 are polar covalent.
C)Bonds with electronegativity differences greater than 1.7 are mostly ionic.
D)Bonds with electronegativity differences less than 1.7 are polar covalent.
4
Bond energy is
A)the amount of energy required to form a specific bond in one mole of molecules
B)the amount of energy required to break a specific bond in one mole of molecules
C)the amount of energy required to form a specific bond in one gram of substance
D)is lower in triple bonds than single bonds
5
If the difference in electronegativities between two atoms is zero, the bonds are
A)nonpolar covalent
B)polar covalent
C)mostly ionic
D)slightly ionic
6
The bond between O and H in OH is
A)nonpolar covalent
B)very polar
C)slightly polar covalent.
D)mostly ionic
7
Double bonds are
A)weaker than single bonds and shorter than triple bonds
B)stronger than single bonds and shorter than triple bonds
C)shorter than single bonds and stronger than triple bonds
D)stronger than single bonds and longer than triple bonds
8
In an exothermic reaction
A)products have bond energies larger than the reactants and energy is released
B)reactants have total bond energies larger than the products and energy is required
C)products have total bond energies larger than the reactants and energy is required
D)reactants have total bond energies larger than the products and energy is released





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