Indiana Science Grade 8

Chapter 6: Atomic Structure and Chemical Bonds

Section 2 Self-Check Quiz-Eng.

1.
A(n) __________ is an atom that has gained or lost an electron and is no longer neutral.
A)compound
B)ion
C)molecule
D)isotope
2.
The ions in ionic compounds are held together by __________.
A)covalent bonds
B)equal sharing of electrons
C)ionic bonds
D)unequal sharing of electrons
3.
An ionic salt is made up of __________ and __________ lined up in a regular pattern.
A)negative metal ions, positive nonmetal ion
B)positive metal ions, negative nonmetal ions
C)positive metal ion, noble gases
D)negative metal ions, positive metalloid ions
4.
A(n) __________ is a pure substance that contains two or more elements.
A)compound
B)ion
C)molecule
D)solution
5.
Based on what you know about sodium chloride, which of the following elements would you expect to form an ionic salt?
A)potassium and iodine
B)sodium and carbon
C)sodium and phosphorus
D)potassium and nitrogen
6.
A(n) __________ is formed between atoms when they share electrons.
A)ionic bond
B)salt
C)covalent bond
D)electrical bond
7.
A double bond is one in which __________.
A)two atoms are joined by sharing electrons
B)atoms share two pairs of electrons
C)three pairs of electrons are shared
D)an atom loses two pairs of electrons to another atom
8.
Which of the following contains polar bonds?
A)sodium fluoride
B)nitrogen molecules
C)magnesium chloride
D)water molecules
9.
Nonpolar molecules do not have __________.
A)double bonds
B)covalent bonds
C)triple bonds
D)unbalanced charges
10.
A(n) ________ is a combination of chemical symbols indicating what elements are present in a molecule.
A)chemical equation
B)subscript
C)chemical formula
D)superscript
11.
In the formula H2O, what does the number 2 indicate?
A)There are two atoms of hydrogen in this molecule.
B)Each hydrogen atom loses two electrons to the oxygen atom.
C)Each hydrogen atom gains two electrons from the oxygen atom.
D)Two atoms each of hydrogen and oxygen are in this molecule.
12.
A(n) __________ is a bond in which electrons are shared unequally.
A)nonpolar
B)ionic
C)polar bond
D)intermediate
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