Multiple Choice
Identify the
choice that best completes the statement or answers the question.
|
|
|
1.
|
Each inner energy level of an atom has a maximum number of ____ it can
hold.
a. | electrons | c. | quarks | b. | neutrons | d. | protons |
|
|
|
2.
|
Dot diagrams are used to represent ____.
a. | atomic numbers | c. | isotopes | b. | atomic mass | d. | outer level
electrons |
|
|
|
3.
|
A chemical symbol represents the ____ of an element.
a. | name | c. | group | b. | reaction | d. | structure |
|
|
|
4.
|
Atoms of the same element with different numbers of neutrons are called
____.
a. | isotopes | c. | metalloids | b. | metals | d. | radioactive
elements |
|
|
|
5.
|
A certain atom has 26 protons, 26 electrons, and 30 neutrons. Its mass number is
____.
|
|
|
6.
|
In a chemical formula, the number of each type of atom in the compound is shown
by numbers called ____.
a. | superscripts | c. | oxidation numbers | b. | chemical symbols | d. | subscripts |
|
|
|
7.
|
The elements that make up a compound and the exact number of atoms of each
element in a unit of the compound can be shown in a ____.
a. | chemical formula | c. | subscript | b. | chemical symbol | d. | superscript |
|
|
|
8.
|
A chemical bond that occurs when atoms share electrons is a(n) ____ bond.
a. | covalent | c. | magnetic | b. | ionic | d. | polyatomic |
|
|
|
9.
|
How many electrons are needed in the outer energy levels of most atoms for the
atom to be chemically stable?
|
|
|
10.
|
What kind of chemical bond is formed when an equal exchange of electrons
occurs?
a. | covalent | c. | ionic | b. | hydrate | d. | magnetic |
|
|
|
11.
|
What is the total number of atoms in the compound
Ca(ClO3)2?
|
|
|
12.
|
How many hydrogen atoms are present in one molecule of ammonium acetate,
NH4C2H3O2?
|
|
|
13.
|
What is the correct formula for zinc chloride?
a. | ZnCl | c. | Zn2Cl2 | b. | ZnCl2 | d. | Zn2Cl |
|
|
|
14.
|
A(n) ____ chemical equation has the same number of atoms of each element on each
side of the equation.
a. | balanced | c. | simple | b. | complex | d. | unbalanced |
|
|
|
15.
|
Each substance on the left side of the arrow in a chemical equation is a
____.
a. | catalyst | c. | product | b. | coefficient | d. | reactant |
|
|
|
16.
|
If heat must be added to a chemical reaction for the reaction to take place, the
reaction is ____.
a. | balanced | c. | exothermic | b. | endothermic | d. | reactant |
|
|
|
17.
|
When one element replaces another element in a compound, the reaction is a ____
reaction.
a. | decomposition | c. | single–displacement | b. | double–displacement | d. | synthesis |
|
|
|
18.
|
The breaking down of a substance into two or more simpler substances is
____.
a. | decomposition | c. | a catalyst | b. | displacement | d. | synthesis |
|
|
|
19.
|
Each substance to the right of the arrow in a chemical equation is a(n)
____.
a. | catalyst | c. | reactant | b. | inhibitor | d. | product |
|
|
|
20.
|
A chemical reaction in which heat energy is released is ____.
a. | endothermic | c. | flammable | b. | exothermic | d. | a formula |
|
|
|
21.
|
Numbers that precede symbols and formulas in a chemical equation are
____.
a. | catalysts | c. | superscripts | b. | coefficients | d. | subscripts |
|
|
|
22.
|
According to the law of conservation of mass, how does the mass of the products
in a chemical reaction compare to the mass of the reactants?
a. | There is no relationship. | b. | The mass of the products is
greater. | c. | The mass of the reactants is greater. | d. | The masses are
equal. |
|
|
|
23.
|
A chemical reaction in which two or more substances combine to form another
substance is called a ____.
a. | synthesis reaction | c. | product | b. | decomposition reaction | d. | reactant |
|
|
|
24.
|
According to the law of conservation of mass, if two atoms of hydrogen are used
as a reactant, how many atoms of hydrogen must be part of the product?
|
|
|
25.
|
What type of reaction is shown in the following chemical equation:
2H2O ® 2H2 + O2?
a. | decomposition | c. | single–displacement | b. | double–displacement | d. | synthesis |
|
|
|
26.
|
An atom has no overall charge if it contains equal numbers of
a. | electrons and protons. | c. | neutrons and electrons. | b. | neutrons and
protons. | d. | None of the
above |
|
|
|
27.
|
Which of the following determines the identity of an element?
a. | atomic number | c. | atomic mass | b. | mass number | d. | overall charge |
|
|
|
28.
|
An atom of gold with 79 protons, 79 electrons, and 118 neutrons would have a
mass number of
|
|
|
29.
|
The smallest particle into which an element can be divided and still be the same
substance is a(n)
a. | electron. | c. | atom. | b. | proton. | d. | molecule. |
|
|
|
30.
|
One property of most nonmetals is that they are
a. | shiny. | c. | flattened when hit with a hammer. | b. | poor conductors of
electric current. | d. | solids at
room temperature. |
|
|
|
31.
|
Most of the elements in the periodic table are
a. | metals. | c. | poor conductors of electric current. | b. | metalloids. | d. | nonmetals. |
|
|
|
32.
|
The element ____ is a metalloid.
a. | silicon, Si | c. | lead, Pb | b. | carbon, C | d. | phosphorus, P |
|
|
|
33.
|
Which class of elements are also called semiconductors?
a. | metals | c. | metalloids | b. | nonmetals | d. | noble gases |
|
Short Answer
|
|
|
 Figure
20-1
|
|
|
34.
|
What type of bond is formed in Figure 20-1?(ionic or covalent)
|
|
|
 Figure
20-2
|
|
|
35.
|
What type of bond is formed in Figure 20-2?(ionic or covalent)
|