Aleks Placement Test: Chemistry
UPDATED Exam Questions and
CORRECT Answers
Matter - Correct Answer- Anything that has mass and takes up space; made of atoms
Atoms - Correct Answer- Basic unit of matter which cannot be broken down and contain
mostly empty space; contains three parts: the electron, proton, and neutron
Elements - Correct Answer- A pure substance that contains only one type of atom
Compound - Correct Answer- Two or more elements that are chemically bonded; includes
ionic and covalent
Mixture - Correct Answer- Two or more substances that are together but not bonded
Pure Substance - Correct Answer- Substance that contains only one kind of compound
Bose-Einstein Condensate - Correct Answer- The state of matter with the lowest energy;
basically a very cold solid
Solid - Correct Answer- A state of matter with strong bonds
Liquid - Correct Answer- A state of matter with weak bonds
Gas - Correct Answer- A state of matter with no bonds
Plasma - Correct Answer- The state of matter with the highest energy; it uses ionization
instead of bonds
Robert Boyle - Correct Answer- First to define an element; any substance is a substance
unless it can be broken down
,John Dalton - Correct Answer- Used and combined previous ideas to discuss the atom;
elements are made of atoms; all atoms of an element are identical; atoms of different
elements are different; law of constant composition; atoms are invisible
Law of Constant Composition - Correct Answer- Atoms of one element can combine with
other elements to form compounds; a given compound always has the same relative numbers
and types of atoms
J.J. Thomson - Correct Answer- Discovered electrons and protons and developed the plum
pudding model of an atom
Electrons - Correct Answer- The negatively charged particle in an atom; circles around the
nucleus in the electron cloud
Proton - Correct Answer- The positively charged particle in an atom; located in the nucleus;
determine the element
Neutron - Correct Answer- The neutral particle in an atom; it has no charge and is located in
the nucleus
Plum Pudding Model - Correct Answer- A model of the atom that depicts a sphere of positive
charge with electrons scattered throughout
Ernest Rutherford - Correct Answer- Conducted an experiment in which he shot alpha
particles at gold foil; roved there was a small, dense nucleus with a positive charge and that
protons are positive
Metals - Correct Answer- Elements located on the left side of the periodic table that want to
lose electrons
Characteristics of Metals - Correct Answer- - Malleable
- Ductile
- Conductive
- Lustrous
, Malleable - Correct Answer- The ability to be molded into shapes
Ductile - Correct Answer- The ability to be pulled into wire
Conductive - Correct Answer- The ability to allow heat or electricity to pass through an
object
Lustrous - Correct Answer- The ability to be shiny
Nonmetals - Correct Answer- Elements located on the right side of the periodic table that
want to gain electrons
Metalloids - Correct Answer- Elements placed in a stair-step line between metals and
nonmetals; they have characteristics of both
Diatomic Molecules - Correct Answer- Elements that occur in pairs in their natural state;
hydrogen, nitrogen, oxygen, fluorine, chlorine, bromine, iodine
Electronegativity - Correct Answer- The ability of a molecule to attract electrons to it;
increases as you move left to right in the table and decreases as you move top to bottom;
fluorine is the hardest
Atomic Radius - Correct Answer- The radius of an atom; decreases as you move left to right
and increases as you move top to bottom
Ionization Energy - Correct Answer- The energy needed to rip off an electron; increases as
you move left to right and decreases as you move top to bottom
Ion - Correct Answer- An atom that has gained or lost electrons
Anion - Correct Answer- An atom that gains electrons and has a negative charge; nonmetals
UPDATED Exam Questions and
CORRECT Answers
Matter - Correct Answer- Anything that has mass and takes up space; made of atoms
Atoms - Correct Answer- Basic unit of matter which cannot be broken down and contain
mostly empty space; contains three parts: the electron, proton, and neutron
Elements - Correct Answer- A pure substance that contains only one type of atom
Compound - Correct Answer- Two or more elements that are chemically bonded; includes
ionic and covalent
Mixture - Correct Answer- Two or more substances that are together but not bonded
Pure Substance - Correct Answer- Substance that contains only one kind of compound
Bose-Einstein Condensate - Correct Answer- The state of matter with the lowest energy;
basically a very cold solid
Solid - Correct Answer- A state of matter with strong bonds
Liquid - Correct Answer- A state of matter with weak bonds
Gas - Correct Answer- A state of matter with no bonds
Plasma - Correct Answer- The state of matter with the highest energy; it uses ionization
instead of bonds
Robert Boyle - Correct Answer- First to define an element; any substance is a substance
unless it can be broken down
,John Dalton - Correct Answer- Used and combined previous ideas to discuss the atom;
elements are made of atoms; all atoms of an element are identical; atoms of different
elements are different; law of constant composition; atoms are invisible
Law of Constant Composition - Correct Answer- Atoms of one element can combine with
other elements to form compounds; a given compound always has the same relative numbers
and types of atoms
J.J. Thomson - Correct Answer- Discovered electrons and protons and developed the plum
pudding model of an atom
Electrons - Correct Answer- The negatively charged particle in an atom; circles around the
nucleus in the electron cloud
Proton - Correct Answer- The positively charged particle in an atom; located in the nucleus;
determine the element
Neutron - Correct Answer- The neutral particle in an atom; it has no charge and is located in
the nucleus
Plum Pudding Model - Correct Answer- A model of the atom that depicts a sphere of positive
charge with electrons scattered throughout
Ernest Rutherford - Correct Answer- Conducted an experiment in which he shot alpha
particles at gold foil; roved there was a small, dense nucleus with a positive charge and that
protons are positive
Metals - Correct Answer- Elements located on the left side of the periodic table that want to
lose electrons
Characteristics of Metals - Correct Answer- - Malleable
- Ductile
- Conductive
- Lustrous
, Malleable - Correct Answer- The ability to be molded into shapes
Ductile - Correct Answer- The ability to be pulled into wire
Conductive - Correct Answer- The ability to allow heat or electricity to pass through an
object
Lustrous - Correct Answer- The ability to be shiny
Nonmetals - Correct Answer- Elements located on the right side of the periodic table that
want to gain electrons
Metalloids - Correct Answer- Elements placed in a stair-step line between metals and
nonmetals; they have characteristics of both
Diatomic Molecules - Correct Answer- Elements that occur in pairs in their natural state;
hydrogen, nitrogen, oxygen, fluorine, chlorine, bromine, iodine
Electronegativity - Correct Answer- The ability of a molecule to attract electrons to it;
increases as you move left to right in the table and decreases as you move top to bottom;
fluorine is the hardest
Atomic Radius - Correct Answer- The radius of an atom; decreases as you move left to right
and increases as you move top to bottom
Ionization Energy - Correct Answer- The energy needed to rip off an electron; increases as
you move left to right and decreases as you move top to bottom
Ion - Correct Answer- An atom that has gained or lost electrons
Anion - Correct Answer- An atom that gains electrons and has a negative charge; nonmetals
