Focus On Physical Science: California Grade 8

Lesson 1: How Atoms Form Compounds

Standards Check

1.
A(n) __________ is a force that holds two atoms together. 3.b
A)isotope
B)chemical bond
C)chemical compound
D)ion
2.
A(n) __________ is a method of representing atoms and the electrons in their outer energy levels. 3.a
A)chemical formula
B)chemical symbol
C)electron dot diagram
D)chemical equation
3.
A(n) __________ is an atom that has gained or lost an electron and is no longer neutral. 3.a
A)isotope
B)compound
C)molecule
D)ion
4.
The ions in ionic compounds are held together by __________. 3.b
A)ionic bonds
B)covalent bonds
C)equal sharing of electrons
D)unequal sharing of electrons
5.
An ionic salt is made up of __________ and __________ lined up in a regular pattern. 3.b
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
6.
(n) __________ is a pure substance that contains two or more elements. 3.b
A)solution
B)ion
C)molecule
D)compound
7.
Based on what you know about sodium chloride, which of the following elements would you expect to form an ionic salt? 3.f
A)potassium and nitrogen
B)sodium and carbon
C)sodium and phosphorus
D)potassium and iodine
8.
A(n) __________ is formed between atoms when they share electrons. 3.b
A)salt
B)ionic bond
C)covalent bond
D)electrical bond
9.
A double bond is one in which __________. 3.b
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
10.
A(n) ________ is a combination of chemical symbols indicating what elements are present in a molecule. 3.b
A)superscript
B)chemical equation
C)subscript
D)chemical formula
11.
In the formula H2O, what does the number 2 indicate? 3.b
A)Two atoms each of hydrogen and oxygen are 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)There are two atoms of hydrogen in this molecule.
Grade 8
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