Focus On Physical Science: California Grade 8

Chapter 5: Combining Atoms and Molecules

Standards Review

1.
Elements in Group 2 of the periodic table have how many valence electrons? 3.f
A)four
B)two
C)six
D)eight
2.
A negative ion has _______. 3.b
A)more neutrons than protons
B)more protons than electrons
C)more electrons than protons
D)more electrons than neutrons
3.
An ionic bond between two atoms is formed when electrons are ________. 3.b
A)removed from both atoms
B)shared between the two atoms
C)added to both atoms
D)transferred from one atom to the other
4.
Elements that are close to each other on the periodic table are likely to form _______. 3.b
A)covalent bonds
B)ionic bonds
C)positive ions
D)noble gases
5.
A single covalent bond contains _______ of shared electrons. 3.b
A)one pair
B)two pairs
C)three pairs
D)four pairs
6.
Which is not a property of ionic compounds? 3.c
A)low melting point
B)brittle
C)dissolve in water
D)solid at room temperature
7.
Which is not a property of ionic compounds? 3.b
A)brittle
B)low melting point
C)dissolve in water
D)solid at room temperature
8.
Why are metals good conductors of heat and electricity? 7.c
A)Metals are ionic compounds.
B)Metals are covalent compounds.
C)Electrons in metals move freely.
D)Electrons are transferred from one atom to another.
9.
What are the elements in Group 18 called? 7.f
A)ions
B)metals
C)monomers
D)noble gases
10.
Covalent compounds that contain carbon atoms are called _______. 3.b
A)salts
B)binary compounds
C)organic compounds
D)synthetic polymers
11.
Which of the following is a property of a covalent compound? 3.b
A)solution is a good conductor of electricity
B)can be solid, liquid or gas at room temperature
C)higher melting point than ionic compounds
D)only solid at room temperature
12.
Which best describes the crystal structure of NaCl? 3.c
A)It has a cubic structure.
B)It is a metallic crystal.
C)It is a molecular crystal.
D)It has a hexagonal structure.
13.
Which is not a physical property of a metal? 7.c
A)ductility
B)good conductor of electricity
C)high melting point
D)poor conductor of heat
14.
About _____ of all the elements are metals. 3.f
A)three-fourths
B)one-third
C)two-thirds
D)two-fifths
15.
Where are nonmetals located on the periodic table? 7.c
A)on the left side
B)on the right side
C)in the center
D)on the left side and in the center
Grade 8
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