NAS 2 Exam UPDATED ACTUAL Exam Questions and CORRECT Answers

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