NAS 2 Exam UPDATED ACTUAL Exam
Questions and CORRECT Answers
Matter - CORRECT ANSWER - anything that has mass and occupies space
Atom - CORRECT ANSWER - Smallest particle of an element
Molecule - CORRECT ANSWER - A group of atoms bonded together
Element - CORRECT ANSWER - A substance that cannot be broken down into simpler
substances
Proton - CORRECT ANSWER - positively charged particle
Neutron - CORRECT ANSWER - particle with no charge
Electron - CORRECT ANSWER - negatively charged particle
atomic number - CORRECT ANSWER - the number of protons in the nucleus of an atom
ionic bond - CORRECT ANSWER - A chemical bond resulting from the attraction
between oppositely charged ions.
polar covalent bond - CORRECT ANSWER - A covalent bond in which electrons are not
shared equally
non polar covalent bond - CORRECT ANSWER - a covalent bond in which the bonding
electrons are shared equally by the bonded atoms, resulting in a balanced distribution of
electrical charge
,Ion - CORRECT ANSWER - An atom or group of atoms that has a positive or negative
charge.
Cation - CORRECT ANSWER - A positively charged ion
Anion - CORRECT ANSWER - A negatively charged ion
hydrophobic interactions - CORRECT ANSWER - a type of weak chemical interaction
caused when molecules that do not mix with water coalesce to exclude water
hydrogen bond - CORRECT ANSWER - A type of weak chemical bond formed when the
slightly positive hydrogen atom of a polar covalent bond in one molecule is attracted to the
slightly negative atom of a polar covalent bond in another molecule.
Solution - CORRECT ANSWER - A homogeneous mixture of two or more substances
Solute - CORRECT ANSWER - A substance that is dissolved in a solution.
Solvent - CORRECT ANSWER - the substance in which the solute dissolves
colloidal suspension - CORRECT ANSWER - Particles remain suspended within the
liquid
Emulsion - CORRECT ANSWER - The colloidal dispersion of one liquid in another
inorganic molecules - CORRECT ANSWER - molecules that do not contain carbon and
hydrogen
, organic molecules - CORRECT ANSWER - molecules that contain carbon and hydrogen
functional groups - CORRECT ANSWER - the components of organic molecules that are
most commonly involved in chemical reactions
amino group - CORRECT ANSWER - a chemical group consisting of a nitrogen atom
bonded to two hydrogen atoms
methyl group - CORRECT ANSWER - A chemical group consisting of a carbon atom
bonded to three hydrogen atoms.
carboxyl group - CORRECT ANSWER - A chemical group consisting of a carbon atom
double-bonded to an oxygen atom and also bonded to a hydroxyl group.
hydroxyl group - CORRECT ANSWER - A chemical group consisting of an oxygen atom
bonded to a hydrogen atom.
phosphate group - CORRECT ANSWER - A chemical group consisting of a phosphorus
atom bonded to four oxygen atoms
water disassociation reaction - CORRECT ANSWER - equilibrium reaction where one
water molecule donates its proton to another
Acid - CORRECT ANSWER - a substance that contributes hydrogen ions to a solution
Base - CORRECT ANSWER - A substance that decreases the hydrogen ion concentration
in a solution.
pH scale - CORRECT ANSWER - measurement system used to indicate the concentration
of hydrogen ions (H+) in solution; ranges from 0 to 14
Questions and CORRECT Answers
Matter - CORRECT ANSWER - anything that has mass and occupies space
Atom - CORRECT ANSWER - Smallest particle of an element
Molecule - CORRECT ANSWER - A group of atoms bonded together
Element - CORRECT ANSWER - A substance that cannot be broken down into simpler
substances
Proton - CORRECT ANSWER - positively charged particle
Neutron - CORRECT ANSWER - particle with no charge
Electron - CORRECT ANSWER - negatively charged particle
atomic number - CORRECT ANSWER - the number of protons in the nucleus of an atom
ionic bond - CORRECT ANSWER - A chemical bond resulting from the attraction
between oppositely charged ions.
polar covalent bond - CORRECT ANSWER - A covalent bond in which electrons are not
shared equally
non polar covalent bond - CORRECT ANSWER - a covalent bond in which the bonding
electrons are shared equally by the bonded atoms, resulting in a balanced distribution of
electrical charge
,Ion - CORRECT ANSWER - An atom or group of atoms that has a positive or negative
charge.
Cation - CORRECT ANSWER - A positively charged ion
Anion - CORRECT ANSWER - A negatively charged ion
hydrophobic interactions - CORRECT ANSWER - a type of weak chemical interaction
caused when molecules that do not mix with water coalesce to exclude water
hydrogen bond - CORRECT ANSWER - A type of weak chemical bond formed when the
slightly positive hydrogen atom of a polar covalent bond in one molecule is attracted to the
slightly negative atom of a polar covalent bond in another molecule.
Solution - CORRECT ANSWER - A homogeneous mixture of two or more substances
Solute - CORRECT ANSWER - A substance that is dissolved in a solution.
Solvent - CORRECT ANSWER - the substance in which the solute dissolves
colloidal suspension - CORRECT ANSWER - Particles remain suspended within the
liquid
Emulsion - CORRECT ANSWER - The colloidal dispersion of one liquid in another
inorganic molecules - CORRECT ANSWER - molecules that do not contain carbon and
hydrogen
, organic molecules - CORRECT ANSWER - molecules that contain carbon and hydrogen
functional groups - CORRECT ANSWER - the components of organic molecules that are
most commonly involved in chemical reactions
amino group - CORRECT ANSWER - a chemical group consisting of a nitrogen atom
bonded to two hydrogen atoms
methyl group - CORRECT ANSWER - A chemical group consisting of a carbon atom
bonded to three hydrogen atoms.
carboxyl group - CORRECT ANSWER - A chemical group consisting of a carbon atom
double-bonded to an oxygen atom and also bonded to a hydroxyl group.
hydroxyl group - CORRECT ANSWER - A chemical group consisting of an oxygen atom
bonded to a hydrogen atom.
phosphate group - CORRECT ANSWER - A chemical group consisting of a phosphorus
atom bonded to four oxygen atoms
water disassociation reaction - CORRECT ANSWER - equilibrium reaction where one
water molecule donates its proton to another
Acid - CORRECT ANSWER - a substance that contributes hydrogen ions to a solution
Base - CORRECT ANSWER - A substance that decreases the hydrogen ion concentration
in a solution.
pH scale - CORRECT ANSWER - measurement system used to indicate the concentration
of hydrogen ions (H+) in solution; ranges from 0 to 14
