Physical Science: Chemistry, Book L

Chapter 1: Chemical Bonds and Atomic Structure

Chemical Bonds

1
How many electrons does an atom of carbon have in its outer energy level?
A)12
B)8
C)6
D)4
2
A(n) __________ is a pure substance that contains two or more elements.
A)solution
B)molecule
C)ion
D)compound
3
What do lithium, sodium, and potassium have in common?
A)They are all Group I elements.
B)They all have two electrons in their outer energy levels.
C)They are all nonmetals.
D)They are all metalloids.
4
Which of the following contains polar bonds?
A)sodium fluoride
B)magnesium chloride
C)nitrogen molecules
D)water molecules
5
What is one difference between satellites and electrons?
A)Satellites have positive electrical charges. Electrons have negative charges.
B)You can calculate exactly where a satellite will be at any time. An electron's position must be estimated.
C)You can calculate exactly where an electron will be at any time. A satellite's position must be estimated.
D)Satellites have a larger negative charge than electrons.
6
Which of the following is NOT true of the elements in Group 18?
A)Their outer energy levels are complete.
B)They are all metalloids.
C)They include the noble gases.
D)They are all nonmetals.
7
Most of an atom's mass is contained in __________.
A)its outer energy shell
B)its nucleus
C)the electron orbits
D)the electron cloud
8
What do atoms of boron and aluminum have in common?
A)They have three electrons in their outer energy levels.
B)They are metals.
C)They have the same number of neutrons in their nuclei.
D)They are metalloids.
9
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
10
An ionic salt is made up of __________ and __________ lined up in a regular pattern.
A)positive metal ions, negative nonmetal ions
B)negative metal ions, positive nonmetal ion
C)positive metal ion, noble gases
D)negative metal ions, positive metalloid ions
11
The atomic number of calcium is 20. How many protons does a calcium atom contain?
A)20
B)0
C)10
D)40
12
The ions in ionic compounds are held together by __________.
A)equal sharing of electrons
B)ionic bonds
C)unequal sharing of electrons
D)covalent bonds
13
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
14
Nonpolar molecules do not have __________.
A)unbalanced charges
B)triple bonds
C)double bonds
D)covalent bonds
15
A(n) __________ is a method of representing atoms and the electrons in their outer energy levels.
A)chemical equation
B)electron dot diagram
C)chemical formula
D)chemical symbol
16
Based on what you know about sodium chloride, which of the following elements would you expect to form an ionic salt?
A)potassium and nitrogen
B)potassium and iodine
C)sodium and carbon
D)sodium and phosphorus
17
Electrons in the sphere closest to the nucleus are in the __________ energy level.
A)middle
B)negative
C)highest
D)lowest
18
A(n) __________ is a force that holds two atoms together.
A)chemical compound
B)isotope
C)chemical bond
D)ion
19
A(n) __________ is formed between atoms when they share electrons.
A)salt
B)electrical bond
C)ionic bond
D)covalent bond
20
The first version of the periodic table of the elements was created by __________.
A)Mendel
B)Minsk
C)Mendelssohn
D)Mendeleev
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