D425 INTRODUCTION TO
CHEMISTRY TEST
QUESTIONS & ANSWERS
1. Describe what a polyatomic molecule is and
provide an example.
A polyatomic molecule is a mixture of
different elements.
A polyatomic molecule is made up of only
two atoms, like oxygen.
A polyatomic molecule consists of
more than two atoms bonded
together, such as sulfur.
A polyatomic molecule is a single atom,
like helium.
2. What are the two categories that matter
can be classified into?
Atoms and molecules
Pure substances and mixtures
Elements and
compounds Solids and
,liquids
,3. Which of the following statements is ?
Formation of table salt:
results in cubic crystals
is an example of solidification
is, in mineralogic terms, formation of the
halide halite
all of the above
4. Describe the role of a reactant in a chemical
reaction. A reactant is a mixture of
different substances.
A reactant is the initial substance that
undergoes a chemical reaction to form a
new substance.
A reactant is a substance that speeds up a
chemical reaction without being
consumed.
A reactant is the final substance produced
in a chemical reaction.
, 5. If a new solid material exhibits a highly
organized crystal lattice structure, what
properties might you expect it to have
compared to a material with a
disordered arrangement?
Higher melting point and greater
hardness Increased solubility and
lower boiling point Lower density and
increased flexibility
Reduced strength and lower thermal
conductivity
6. What does the periodic table display?
The atomic mass of each
element only. Only metals and
their properties.
All known elements according to
similarities between elements'
properties.
The chemical reactions of elements.
7. What is the definition of a pure substance?
CHEMISTRY TEST
QUESTIONS & ANSWERS
1. Describe what a polyatomic molecule is and
provide an example.
A polyatomic molecule is a mixture of
different elements.
A polyatomic molecule is made up of only
two atoms, like oxygen.
A polyatomic molecule consists of
more than two atoms bonded
together, such as sulfur.
A polyatomic molecule is a single atom,
like helium.
2. What are the two categories that matter
can be classified into?
Atoms and molecules
Pure substances and mixtures
Elements and
compounds Solids and
,liquids
,3. Which of the following statements is ?
Formation of table salt:
results in cubic crystals
is an example of solidification
is, in mineralogic terms, formation of the
halide halite
all of the above
4. Describe the role of a reactant in a chemical
reaction. A reactant is a mixture of
different substances.
A reactant is the initial substance that
undergoes a chemical reaction to form a
new substance.
A reactant is a substance that speeds up a
chemical reaction without being
consumed.
A reactant is the final substance produced
in a chemical reaction.
, 5. If a new solid material exhibits a highly
organized crystal lattice structure, what
properties might you expect it to have
compared to a material with a
disordered arrangement?
Higher melting point and greater
hardness Increased solubility and
lower boiling point Lower density and
increased flexibility
Reduced strength and lower thermal
conductivity
6. What does the periodic table display?
The atomic mass of each
element only. Only metals and
their properties.
All known elements according to
similarities between elements'
properties.
The chemical reactions of elements.
7. What is the definition of a pure substance?
