Numbered Interval Represents the Heat of Reaction

1) А system is said to Ье in а state of dynamic equilibrium when the А) rate at which products are formed is greater than the rate at which reactants are formed concentration of products is greater than the concentration of reactants rate at which products are fonned is the same as the rate at which reactants аге foпned ) concentration of products is the same as the concentration of reactants Under what contlitions are gases most soluЫe in V.'ater? '"л) high pressure and high temperature В) low pressure and low temperature @mgh pressure and low temperature D) low pressure and high temperature At which temperature can ,Nater contain the most dissolved oxygen at а pressure of 1 atmosphere? @10. 0 с В) 20. С D) 30. С С) 40. С 0 0 0 Which description applies to а system in а sealed flask that is half full of water? А) Only condensation occurs, but it eventually stops. В) Only evaporation occurs, but it eventually stops. 5) А solution in which an equilibrium exists between dissolved and undissolved solute rnust Ье А) unsaturated 6) @вoth evaporation and condensation occur. D) Neither evaporation nor condensation occurs. @)aturated D) concentrated С) dilute -Given the reaction at equilibrium: -t 1 � A(g) + B(g) ===i C(g) + D(g) At constant ternperature and pressure, an increase in the concentration of A(g) will cause t С) an increase in the concentration of B(g) D) а decrease in the concentration of C(g) � а decrease in the concentration of D(g) а decrease in the concentration of B(g) @) 7) Given reaction iet� libri : :r; AgCl(s) <==;Ag+ (aq) + cJ-(aq) �----· As tl1e concentration of the Ag+ ions is increased, at а constant temperature, the concentration of с1- ions @)ctecreases 8) С) increases В) remains the same Given the reaction at equilibrium: 2SOz(g) + Oz(g) <==; 2SO3(g) + 184 kJ Which change will increase the concentration of SO3(g)? (§)ncreasing the concentration of Oz(g) А) increasing the temperature D) decreasing the pressure В) decreasing the concentration of SOz(g) 9) Given the equilibrium reaction: 2SOz(g) + O2(g) ==а 2SO3 (g) + heat s J When the pressure оп the system is increased, the concentration of the SO3 will А) remain the same C!)ncrease С) decrease Statement С: LeChatelier's Principle states that when а stress is brought to bear upon а system at equilibrium, the system will react so as to relieve the stress. Тhе Haber Process reaction is used in the mэ.nufacture of ammocia using the fol!owing r� � 3H2 (g} + N2 (g) = 2NН3 (g) + 91.8 kJ During this reaction, hydroge-n gas and nitrogen gas comЫne to form am.mocia gas. At а spec:ific point in the reactiOD., the reYerse reaction rate becomes equal to the forwaxd reaction rate bring;.ng about а system in equilibrium. 5 6 Question: Exp!ain how the stresses of temperature' and pressure can Ье manipulated, in order to make the equilibrium sJ,JJt to the left.[l] i°O \Q <с,5 � ,t- \7 � �М ,l,'1 � t-ow� k� Question: Name one factor that could Ье manipulated in order to get t.'1e reverse �•action to occur at а faster rate. [1] Statement D: А Potential Energy Diagram can Ье used to il1ustrate the >­ change in potential energy·that is tak- � ing р!асе wjthin а chemical reaction. .5 I!lustration: А potential energy d.iagram � sho�g an endothermic reaction, with � в ал enthalpy change = 66.4 kJ accompa­ nied Ъу the following chem.ical reaction: N2 + 202 + 66.4 kJ = 2N02 7 Reocfion Coordlnaie Question: Using the Potential Епегgу Diagram and equation, d.iscuss how the potential energy of the products compares to that of the reac­ tants. tlJ �1с �fго�� м�J:: � \J -\� \/4) l L ��-v,л___ �� ctk� &Л'\.9.Л� � t:,� ьь � --- 1. For tl1e reaction А ➔ В the following infoпnation is given: ЛН = -10 kJ/mol potential energy (Н) of А = 15 kJ/mol acti vation energy = 7 kJ/mol с: .., ';: +--+,-,+'+-,--+,-+-+-! -1---1 � -I--I-Ц....i--...j......-c+ � 1\ 1 ' @ ,-, :.:: -1---c+--"i¼"+--+--+-+-. +---,, .., +§ -1---'+-+-�--+--+-\ ' ' • .. ,' ... ;,•1-.с.:}' о 'l. а. Draw the potential energy graph of the reaction А ➔ В on the axes provided. (2 points) Reaction Coordinate Ь. What is the potential energy of В? (1 point) с. Is the reaction endotheпnic or exothermic? (1 point) d. What part of the graph is affected Ьу а catalyst? (1 point) е. What is the activation energy for the reaction В ➔ А? ----"'-----'----� (1 point) 2. Which of the following systems are at dynamic equilibrium, and which are not? Provide the reason for your answer. а. Solid sodium chloride is added to water in а beaker. It stops dissolving with some solid left on the bottom of the beaker. (2 points) 1::=-.0� \ \___ • '-/ Б сСtцл � cJ � · V\__ Ь. А drop of alcohol is added to а closed flask. The alcohol completely evaporates. (2 points) с. 50 mL of alcohol is placed in а 100 mL Б • ker. (2 points) �\ о�е d( d. Sodium chromate (yellow) is added to water. The solution continues to become darker yellow.(2points) �о EJ:Ly� _ LD\oc· ,S�a1л.\rl