CEM 142 EXAM 1 QUESTIONS &
ANSWERS(RATED A)
bond BREAKING - ANSWERABSORB energy from surroundings
-requires energy to overcome
bond FORMING - ANSWERRELEASE energy to surroundings
effective nuclear charge - ANSWERcharge felt by valence electrons
-increase in ENC attracts electrons more strongly toward the nucleus
Coulomb's Law - ANSWERopposite charges attract
-like charges repel
F=kq1q2/r^2
electron pair geometry - ANSWERSHAPE INCLUDING LONE PAIRS
-count as bonds
molecular shape - ANSWERnot including lone pairs
stronger IMFs... - ANSWERhigher boiling point
state function - ANSWERdepend only on initial and final states
-P,V,T
First law of Thermodynamics - ANSWERenergy can be neither created nor destroyed
enthalpy - ANSWERheat absorbed of emitted during a reaction under constant pressure
entropy - ANSWERmeasure of the number of possible arrangements for a given state
-for the universe, always increases
concerning entropy, higher the temperature - ANSWERsmaller the effect on entropy
delta G=0 - ANSWERat equilibrium
-during a phase change
-rates of reactions are the same, no net change
saturated - ANSWERno more solute will dissolve
-no more available solvent to interact with
immiscible - ANSWERsolute and solvent DO NOT mix up, forming two layers
-ex: oil and water
ANSWERS(RATED A)
bond BREAKING - ANSWERABSORB energy from surroundings
-requires energy to overcome
bond FORMING - ANSWERRELEASE energy to surroundings
effective nuclear charge - ANSWERcharge felt by valence electrons
-increase in ENC attracts electrons more strongly toward the nucleus
Coulomb's Law - ANSWERopposite charges attract
-like charges repel
F=kq1q2/r^2
electron pair geometry - ANSWERSHAPE INCLUDING LONE PAIRS
-count as bonds
molecular shape - ANSWERnot including lone pairs
stronger IMFs... - ANSWERhigher boiling point
state function - ANSWERdepend only on initial and final states
-P,V,T
First law of Thermodynamics - ANSWERenergy can be neither created nor destroyed
enthalpy - ANSWERheat absorbed of emitted during a reaction under constant pressure
entropy - ANSWERmeasure of the number of possible arrangements for a given state
-for the universe, always increases
concerning entropy, higher the temperature - ANSWERsmaller the effect on entropy
delta G=0 - ANSWERat equilibrium
-during a phase change
-rates of reactions are the same, no net change
saturated - ANSWERno more solute will dissolve
-no more available solvent to interact with
immiscible - ANSWERsolute and solvent DO NOT mix up, forming two layers
-ex: oil and water
