ber 7, 2017 Chem 1018 Final 3) (6 Pts) Answer the following questions based on the potential energy here: a) Does the graph represent an endothermic or exothermie reaction? Circle one. b) Determine the heat of reaction, ?? (enthalpy change) for this reaction. I\'m looking for an actual number here. Be sure to include the sign. 100 PE 60 How much energy is absorbed by the Energy of activation? Again an actual needed e) 401A+B C+ D Progress of the reaction 4) (5 Pts) Given the following solutions, which would produce the lowest freezing point? a) 0.20 m ethylene glycol c) 0.10 m MgSO 0.20 m LiCI b) ) 0.20 m CalNO point would likely be: (5 pts) a) H2O b)NH c) K20 d) KCI e) SrO 6) (5 Points) Place H20, Ha, F2, MgO and NaCl in order of increasing melting point (lowest to highest). This is all about intermolecular forces Solution I am solving Q3(first question with multiple-subparts) as per Chegg guidelines, post multiple question to get the remaining answers Q3) a) The reaction represents an exothermic reaction, since Potential energy of product is less than the potential energy of reactants, which means Delta H(rxn) is negative,which implies the reaction will release heat to the system b) Delta H(rxn) = Delta H(products) - Delta H(reactants) => 20 kJ - 40 kJ => -20 kJ c) The activation energy is the amount of energy barrier needs to be cross in order to trigger the pathway from reactants to products Activation energy for this reaction = 100 kJ - 40 kJ = 60 kJ .

1. ber 7, 2017 Chem 1018 Final 3) (6 Pts) Answer the following questions based on the potential
energy here: a) Does the graph represent an endothermic or exothermie reaction? Circle one. b)
Determine the heat of reaction, ?? (enthalpy change) for this reaction. I'm looking for an actual
number here. Be sure to include the sign. 100 PE 60 How much energy is absorbed by the
Energy of activation? Again an actual needed e) 401A+B C+ D Progress of the reaction 4) (5
Pts) Given the following solutions, which would produce the lowest freezing point? a) 0.20 m
ethylene glycol c) 0.10 m MgSO 0.20 m LiCI b) ) 0.20 m CalNO point would likely be: (5 pts) a)
H2O b)NH c) K20 d) KCI e) SrO 6) (5 Points) Place H20, Ha, F2, MgO and NaCl in order of
increasing melting point (lowest to highest). This is all about intermolecular forces
Solution
I am solving Q3(first question with multiple-subparts) as per Chegg guidelines, post
multiple question to get the remaining answers
Q3)
a) The reaction represents an exothermic reaction, since Potential energy of product is less
than the potential energy of reactants, which means Delta H(rxn) is negative,which implies
the reaction will release heat to the system
b) Delta H(rxn) = Delta H(products) - Delta H(reactants)
=> 20 kJ - 40 kJ
=> -20 kJ
c) The activation energy is the amount of energy barrier needs to be cross in order to
trigger the pathway from reactants to products
Activation energy for this reaction = 100 kJ - 40 kJ = 60 kJ