Transcript True or False

CHAPTER 2
TRASH BALL
REVIEW
Adrian Daniels
Chemistry deals with
a. Composition of substances
b. Changes that occur in substances
c. Substances that make up organisms
d. All of the choices are correct
D
Which of the following substances is
an element?
a. Iron
b. Carbon
c. Oxygen
d. All of the choices are correct
D
Which of the following substances
comprise over 95 percent of the
human body
a. Carbon, hydrogen, oxygen, nitrogen
b. Calcium, hydrogen, oxygen, nitrogen
c. Carbon, phosphorus, oxygen, hydrogen
d. Calcium, phosphorus, hydrogen, nitrogen
A
The first electron shell of an atom
can hold a maximum of
a. 1 electron
b. 2 electrons
c. 4 electrons
d. 8 electrons
B
The formula H2O means
a. An atom contains 2 hydrogen molecules and 1 oxygen molecule
b. An atom contains 1 hydrogen molecule and 2 oxygen molecules
c. A molecule contains 2 hydrogen atoms and 1 oxygen atom
d. A molecule contains 1 hydrogen atom and 2 oxygen atoms
C
A decomposition reaction can be
symbolized as
a. A + B > C + D
b. A + B > AB
c. AB > A+B
d. C + D> AB
C
As a group, compounds that release
ions when they dissolve in water are
called
a. Acids
b. Bases
c. Salts
d. Electrolytes
D
A chemical reaction in which pairs
of two different molecules trade
positions with one another is a(n)
a. Decomposition reaction
b. Exchange reaction
c. Reversible reaction
d. Synthesis reaction
B
The difference in hydrogen ion
concentration between solutions
with pH 4 and pH 5 is
a. Two fold
b. Five fold
c. Tenfold
d. Twentyfold
C
A person has alkalosis if the blood
pH
a. Rises above 7.0
b. Drops below 7.0
c. Rises above 7.4
d. Drops below 7.4
C
Which of the following is the best
source of saturated fat?
a. Corn oil
b. Soybean oil
c. Coconut oil
d. None of the choices contain saturated fat
C
An atom is made of
a. A nucleus
d. electrons
b. Protons
e. all of the above
c. Neutrons
D
Excess iron and iron deficiency lead
to abnormal function.
a. True
b. False
A
When atoms combine, they gain or
lose
a. Electrons
c. protons
b. Neutrons
d. nuclei
A
Atoms that have the same atomic
numbers but different atomic
weights are
a. Catalysts
c. isotopes
b. Neutrons
d. Heliotropes
C
An ion is
a. An atom that is electrically charged
electron
c. an atom that has lost an
b. An atom that has gained an electron
d. all of the above
A
In forming a covalent bond,
electrons are
a. Shared by two atoms
b. Given up by an atom
c. Taken up by an atom
d. None of the above
A
An ionic bond is created by
a. A positive and negative ion attracting each other
b. Two or more positive ions combining
c. Two or more negative ions combining
A
True or False
The number of protons within an
atom of an element is equal to its
atomic weight
FALSE
True or False
Sodium and chloride atoms
combine readily because they
both tend to lose electrons.
TRUE
True or False
An atom that has gained or lost
electrons is called an ion.
TRUE
True or False
Water is an example of a
compound
TRUE
True or False
A substance that releases
hydrogen ions in water is a base.
FALSE
True or False
Chemically stable atoms always
have their outermost electron
shell full.
TRUE
True or False
An electrolyte is defined as a
substance that ionizes in water.
TRUE
True or False
A complex carbohydrate has a
phosphate group attached to the
sugar molecule.
FALSE
The branch of science that deals
with composition of substances is
________________________
CHEMISTRY
The substances that comprise all
matter are called
_______________________________.
ELEMENT
The atomic number of an element is
determined by the number of
_________________________.
PROTONS
An element is inactive if
___________________________.
IF OUTER SHELLS ARE FULL
TO THE MAX
The atomic weight of an element is
determined by the number of
_______________ ______________
______________.
PROTONS AND NEUTRONS
Water is formed by molecules of
hydrogen and oxygen united by a
________________ bond.
POLAR
A compound is formed when atoms
of _________________ elements
combine.
DIFFERENT
C6H12O6 is an example of a(n)
_____________ formula.
MOLECULAR
Two major types of chemical
reactions are called
_________________ and
_________________.
SYNTHESIS AND
DECOMPOSITION
An electrolyte that releases
hydrogen ions in water is a(n)
_______________________.
ACID
Electrolyte that release ions that
combine with hydrogen ions are
called __________________.
BASES
Organic substances always contain the
elements hydrogen and __________.
CARBON
The midpoint of the pH scale is pH
____.
7
The opposite of a decomposition
reaction is called __________.
SYNTHESIS
Fats, phospholipids, and steroids are
important ______________________
found in the human cell.
LIPIDS
An enzyme is a(n)
_____________________ that acts as
a catalyst.
PROTEIN
Substances that release hydrogen
ions (H+) in water are called
__________________
ACIDS
Substances that release ions that
combine with hydrogen ions are
_____________________
BASES
An inorganic substance that
releases ions when it reacts with
water is known as a(n)
_____________
ELECTROLYTE
The pH measures concentrations
of _____________ ______________.
HYDROGEN IONS
The parts of an atom that carry
single negative electrical charges
are called __________.
Electrons
Matter is defined as anything that
__________.
HAS WEIGHT AND TAKES UP
SPACE