CHEMISTRY 101 EXAM 3 QUESTIONS
WITH CORRECT ANSWERS
Type of process of the forming of the ionic compounds - CORRECT ANSWER --
reaction is exothermic because of the lattice energy (it releases heat during formation)
-transfer of electron from metals to nonmetals is endothermic
ionic bond models - CORRECT ANSWER --
high heat to break apart lattice (high melting points) because there are no free electrons
-
nondirectional (as you move away from the center of the ion the forces are equally as strong in
all directions)
-
ionic solids dissolve in water or melt, the cations and anions dissociate and free ions to allow for
electrical currents to flow through
ionic compound formulas - CORRECT ANSWER --always contain positive and negative ions
-in a chemical formula, the sum of the charges of positive cations and negative anions are equal
-the formula of an ionic compound reflects the smallest whole number ratio of ions
common names - CORRECT ANSWER --nicknames learned by familiarity
systematic names - CORRECT ANSWER --determine from the chemical formula and vice versa
ionic compounds are made up of - CORRECT ANSWER -metals and nonmetals
electronegativity - CORRECT ANSWER --
ability of an atom to attract electrons to itself in a chemical bond
, -increases across a period and decreases down a group
-larger the atom, the less ability it has to attract electrons to itself in a chemical bond
degree of polarity - CORRECT ANSWER --
depends upon the electronegativity difference between two bonding atoms
-greater the difference, the more polar the bond
nonpolar (covalent) - CORRECT ANSWER --
two atoms with the same electronegativities form a covalent bond and share electrons equally
ionic bond in terms of polarity - CORRECT ANSWER --
large electronegativity difference (such as normally between a metal and nonmetal)
polar covalent - CORRECT ANSWER --intermediate electronegativity change
effect of electronegativity on the bond type - CORRECT ANSWER -Small change (0-.4) Covalent
Intermediate change (.4-2) Polar Covalent
Large change(2+) Ionic
dipole moment - CORRECT ANSWER --
occurs anytime there is separation of positive and negative charge
-magnitude of the moment=magnitude(q)*distance(r)
-units is in D (debye)
-quantify the polarity of a bond by the size of it's dipole moment
-
smaller the magnitude of the charge separation and the smaller the distance between charges t
he smaller the dipole movement
-more change in electronegativity means higher dipole movement
WITH CORRECT ANSWERS
Type of process of the forming of the ionic compounds - CORRECT ANSWER --
reaction is exothermic because of the lattice energy (it releases heat during formation)
-transfer of electron from metals to nonmetals is endothermic
ionic bond models - CORRECT ANSWER --
high heat to break apart lattice (high melting points) because there are no free electrons
-
nondirectional (as you move away from the center of the ion the forces are equally as strong in
all directions)
-
ionic solids dissolve in water or melt, the cations and anions dissociate and free ions to allow for
electrical currents to flow through
ionic compound formulas - CORRECT ANSWER --always contain positive and negative ions
-in a chemical formula, the sum of the charges of positive cations and negative anions are equal
-the formula of an ionic compound reflects the smallest whole number ratio of ions
common names - CORRECT ANSWER --nicknames learned by familiarity
systematic names - CORRECT ANSWER --determine from the chemical formula and vice versa
ionic compounds are made up of - CORRECT ANSWER -metals and nonmetals
electronegativity - CORRECT ANSWER --
ability of an atom to attract electrons to itself in a chemical bond
, -increases across a period and decreases down a group
-larger the atom, the less ability it has to attract electrons to itself in a chemical bond
degree of polarity - CORRECT ANSWER --
depends upon the electronegativity difference between two bonding atoms
-greater the difference, the more polar the bond
nonpolar (covalent) - CORRECT ANSWER --
two atoms with the same electronegativities form a covalent bond and share electrons equally
ionic bond in terms of polarity - CORRECT ANSWER --
large electronegativity difference (such as normally between a metal and nonmetal)
polar covalent - CORRECT ANSWER --intermediate electronegativity change
effect of electronegativity on the bond type - CORRECT ANSWER -Small change (0-.4) Covalent
Intermediate change (.4-2) Polar Covalent
Large change(2+) Ionic
dipole moment - CORRECT ANSWER --
occurs anytime there is separation of positive and negative charge
-magnitude of the moment=magnitude(q)*distance(r)
-units is in D (debye)
-quantify the polarity of a bond by the size of it's dipole moment
-
smaller the magnitude of the charge separation and the smaller the distance between charges t
he smaller the dipole movement
-more change in electronegativity means higher dipole movement
