SCIENCE 111 TEST 2
REVIEW QUESTIONS
(In multiple-choice questions, there can be more than one
correct answer)
5
Vinegar is a dilute solution of acetic acid and water. If you had a container of pure acetic acid,
explain how you would determine both the mass and the volume of one mole of
acetic acid? (The molecular formula of this compound is C2H4O2)
You would add the atomic
weights of each atom in the compound times the number of atoms of each and that
would equal the mass in grams of one mole of acetic acid (or Avogadro’s number
of acetic acid molecules). You would
put a beaker on the scale, tare the beaker, and fill it with acetic acid until
it reached that mass. Then you would see what the volume in milliliters was.
7
For the element argon tell the
A
Element symbol Ar
B
Atomic number 18
C
Atomic weight 39.948
D
Number of protons 18
E
Average number of neutrons 39.948 – 18 =
F
Number of electrons in a neutral atom 18
G
Whether it is a metal, nonmetal, or
semiconductor
H
Whether you would expect it to be reactive or
nonreactive
1
8
Which of the following are ways that elements are arranged on the
periodic table?
A
Solutions, suspensions, and heterogeneous mixtures
B
Ions and isotopes
C
Molecules, compounds, and elements
D
Solids, liquids, gases
E
Chemical behavior, number of protons, and atomic radius
2
9
Differences between metals and nonmetals include:
A
A
Metals tend to lose electrons and nonmetals tend to gain electrons
B
B
Metals form negative ions and nonmetals form positive ions.
C
C
Metals comprise the left 2/3's of the periodic table and nonmetals are on the
right side of the table.
D
D
Sometimes semi-conductors act like metals, sometimes like nonmetals.
3
10
Which of the following statements about the elements is correct?
A
A
Alkaline earth metals are very stable because all of their outermost
electron shells are filled to capacity.
B
B
Alkali metals are also called the rare earth metals.
C
C
Alkali metals are the most reactive metals.
D
D
Noble gases are the most reactive nonmetals.
E
E
Halogens rarely react with metals.
12
When you mix
lipids and water (as with phospholipids in the plasma membrane), the lipids do
not go into solution. Which statement
below is the best explanation of this phenomenon?
A A
Lipids and
water are both polar molecules so they repel each other.
B B
Lipids and
water are both nonpolar molecules so they repel each other.
C C
Lipids are
polar and water is nonpolar.
D D
Lipids are nonpolar and water is polar.
E
E Both A and C
12
14
Which statement
below is true of an ionic bond?
A A
is formed by
non-metallic elements transferring electrons to one another.
B B
is formed by
metallic elements transferring electrons to one another.
C
C Electrons lost by a metal are gained by a nonmetal.
D D
Two atoms share
two pairs of electrons.
E
E An atom of a metal bonds
with an atom of a noble gas.
13
15
A covalent bond
in which there is unequal sharing of a pair of electrons is called a______?
Why?
A A
Hydrogen bond.
B B
Double covalent
bond.
C C
Polar covalent bond.
D D
Nonpolar
covalent bond.
14
16
Which of the
following is a property of an acid?
A A
Feels slippery
to the skin.
B B
Is anything
above 7 on the pH scale.
C C
Has a bitter
taste.
D D Donates protons when
dissolved in water.
E
E Donates hydroxide ions (OH-)
when dissolved in water
15
18
What are the boiling and freezing points of distilled water in both
Fahrenheit (212 and 32) and Celsius (100 and 0)?
16
19
What kind of bond will each of the following groups of elements most
likely form? Give the molecular formula
and explain why.
A A
Nitrogen + Oxygen, covalent, N2O
B B
Hydrogen + Oxygen covalent, H2O
C
C Hydrogen
+ Chlorine ionic, HCl
D D
Potassium + Chlorine ionic, KCl
20
For the following molecular gases, write the electron dot notation,
structural formula and molecular formulas:
A Hydrogen, H2
B Nitrogen N3
C Oxygen O2
D Chlorine Cl2
E Water
vapor H2O
F Methane
(one carbon, four hydrogens) CH4
21
What is the correct molecular formula when the following groups of
elements are combined? Explain how you
know.
A aluminum
and fluorine AlF3
B Aluminum
and oxygen Al 2 O3
C Calcium
and oxygen CaO
17
22
Acetylene is a colorless gas used in metal cutting and welding (as an
acetylene torch). A molecule of
acetylene contains two atoms of hydrogen and two atoms of carbon. For this molecule:
A What
kinds of bonds hold the hydrogen and carbon together. covalent
B Draw
the electron dot notation
C Draw
the structural formula
D Write the molecular formula H2C2