SEM 2- 1ST QUARTER

Question 1

the attractive force or bond between molecules, which is responsible in keeping matters in solid or liquid phase

Answer 1

INTRAMOLECULAR

Question 2

are the forces that hold atoms together within a molecules

Answer 2

INTRAMOLECULAR

Question 3

formed by the complete transfer of valence electron atoms

Answer 3

IONIC BOND

Question 4

• the metal loses electrons to become a positively charged cation
• the nonmetal accepts those electrons to become a negatively charged anion

Answer 4

IONIC BOND

Question 5

type of chemical bond that generates two oppositely charged ions

Answer 5

IONIC BOND

Question 6

• formed between atoms that have similar electronegativities
• affinity or desire for electrons
• both atoms have similar affinity for electron and neither has a tendency to donate them, they share electrons in order to achieve octet configuration and become more stable

Answer 6

COVALENT BOND

Question 7

types of covalent bond formed between same atoms or atoms with very similar electronegativities

Answer 7

NONPOLAR COVALENT BOND

Question 8

exists when atoms with different electronegativities share electrons in a covalent bond

Answer 8

POLAR COVALENT BOND

Question 9

• forces that exist between molecules
• much weaker than the intramolecular forces
• determine the physical properties of molecules like their boiling point, melting point, density and enthalpies of fusion and vaporization

Answer 9

INTERMOLECULAR

Question 10

attractive forces between the positive end of one polar molecule and the negative end of another polar molecule

Answer 10

DIPOLE-DIPOLE FORCE

Question 11

nonpolar molecules become polar molecules TEMPORARILY

Answer 11

INSTANTANEOUS DIPOLE

Question 12

result of electrostatic attraction between an ion and a molecule containing a dipole

Answer 12

ION-DIPOLE FORCE

Question 13

• a special kind of dipole
• dipole interaction that occurs specifically between a hydrogen atom bonded to either an oxygen, nitrogen or fluorine atom

Answer 13

HYDROGEN BONDING FORCE

Question 14

also known “London Dispersion Force”

Answer 14

DISPERSION FORCE

Question 15

who discovered dispersion force

Answer 15

Fritz London, German- American Physicist, 1900-1954

Question 16

• weakest intermolecular force of attraction
• this force is present in all molecules whether polar or nonpolar
• the more electrons a molecule has the stronger

Answer 16

DISPERSION FORCE

Question 17

force that causes molecules on the surfaces of the liquid to be push together and form a layer and it is not broken by the large surface covered by their feet

Answer 17

SURFACE TENSION

Question 18

ability of liquid molecules to flow in narrow tubes or porous material

Answer 18

CAPILLARY ACTION

Question 19

attraction between like molecules

Answer 19

COHESION

Question 20

attraction between unlike molecules

Answer 20

ADHESION

Question 21

measure of a liquid’s resistance to flow

Answer 21

VISCOSITY

Question 22

a common substance on earth that we often overlook its unique characteristics

Answer 22

WATER

Question 23

a charged or polar substance that interacts with and dissolves in water

Answer 23

HYDROPHILIC

Question 24

hydro means “ ” and philic means “ ”

Answer 24

WATER AND LOVING

Question 25

nonpolar molecules like oils and fats do not interact well with water. They separate from it rather than dissolve in it

Answer 25

HYDROPHOBIC

Question 26

phobic means

Answer 26

FEARING

Question 27

density of a liquid water

Answer 27

1g/cm^3

Question 28

density of ice

Answer 28

0.9168g/cm^3

Question 29

mass per unit volume of a substance

Answer 29

DENSITY

Question 30

amount of heat needed to turn 1g of liquid into a vapor, without a rise in temperature of the liquid

Answer 30

HEAT OF VAPORIZATION

Question 31

general term that expresses the quantity of solute contained in a given amount of solution

Answer 31

CONCENTRATION

Question 32

used when the solute in a solution is a solid

Answer 32

PERCENT BY MASS

Question 33

the percentage of solute in a solution can more easily be determined by volume when the solute and solvent are both liquid

Answer 33

PERCENT BY VOLUME

Question 34

the phenomenon that occurs when the boiling point of a liquid (solvent) is increased when another compound is added

Answer 34

BOILING POINT ELEVATION

Question 35

occurs when the freezing point of a liquid is lowered or depressed by adding another compound to it

Answer 35

FREEZING POINT DEPRESSION

Question 36

the “heat content” of a system

Answer 36

ENTHALPY

Question 37

enthalpy of a system ___ when energy is added

Answer 37

INCREASES

Question 38

enthalpy of a system ___ when energy is released or given off

Answer 38

DECREASES

Question 39

measures the heat released/absorbed by a reaction that occurs at constant pressure

Answer 39

ENTHALPY OF REACTION

Question 40

reactions or processes that release energy, usually in the form of heat or light

Answer 40

EXOTHERMIC

Question 41

reactions that require external energy, usually in the form of heat, for the reaction to proceed

Answer 41

ENDOTHERMIC