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36 Cards in this Set
- Front
- Back
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the value of delta E for a stem that preforms 13 kj of work on its surroundings and loses 9kj of heat is_____ Kj A) -13 B) 4 C) -22 D) -4 E) 22 |
-22 |
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a chemical reaction that releases heat to surroundings is said to be ___ and has a ____ delta H at constant pressure A) endothermic, positive B) endothermic, negative C) exothermic, negative D) exothermic, Positive E) exothermic, neutral |
exothermic, negative
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the temperature of a 12.58g sample of calcium carbonate increases from 23.6C to 38.2C. if the specific heat of calcium is 0.82J/g-K, how many joules of heat are absorbed? A) 410 B) 5.0 C) 0.82 D) 151 E) 7.5 |
151 |
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the value of delta H degree for the reaction below is -482kJ. calculate the heat(kj) released to the surroundings when 38.5 g of O2 reacts with excess CO. 2Co+O2---> 2CO2 A) 482 B) 65.7 C) 580 D) 2.65X10^3 E) 210 |
580 |
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delta H for the reaction: IF5--> IF3+IF2 is ____ kJ, give the data below. IF+F2-->IF3 delta H=-390 IF+2F2--> IF5 delta H=-745 A) +1135 B)+35 C)-1135 D) -35 E) +355 |
+355 |
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a 6.50g sample of copper metal at 25.0C is heated by the additional 84.0J of energy. the final temperature of the copper is _____C. the specific heat capacity of copper is 0.38J/g-K A) 59.0 B) 29.9 C) 9.0 D) 34.0 E) 25.0 |
59.0 |
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one significant difference between gases and liquids is that ___ A) gases are always mixtures. B) a gas may consist of both elements/ compounds. C) a gas assumes the volume of its container. D) a gas is made up of molecules. E) all of the above are correct. |
C) a gas assumes the volume of its container.[
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"isothermal" means____. A) at constant temperature B) ideal temperature and pressure conditions C) cariable temperature/ pressure conditions D) constant pressure |
A) at constant temperature
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as a solid element melts, the atoms become___& they have ___ attraction for one another. A) more separated, less B) larger, greater C) closer together, less D) more separated, more E) closer together, more |
A) more separated, less
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the strongest inter particle attraction exist between particles of a___ & the weakest interpaticle attractions exist between particles of ___ A) gas, solid B) solid,liquid C) solid, gas D) liquid , gas E) liquid, gas |
C) solid, gas
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which one of the following exhibits dipole-dipole attraction between molecules. A) BCL3 B) AsH3 C) CL2 D) XeF4 E) CO2 |
B) AsH3
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which one of the following should have the lowest billing point? A) H2S B) CH4 C) NH3 D)HCl E) CH3OH |
B) CH4
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what is the predominant intermolecular force in CH3CH2OH? A) ion-dipole attraction B) ionic bonding C) london- dispersion forces D) hydrogen-bonding E) induced dipole dipole attraction |
D) hydrogen bonding |
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large intermolecular forces in a substance are manifested by____. A) high boiling point. B) high heats of fusion and vaporization C) low vapor pressure D) high critical temperatures and pressures E) all of the above. |
all of the above
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the enthalpy change for converting 1.00 mol of ice at -50.0C to water at 70.0C is ___ kJ. the specific heat of ice, water, and steam are 2.09J/g-k, 4.18J/g-kand 1.84J/g-k, respectively . for H2O delta H fus=6.01kJ/mol and delta Hvap=40.67kJ/mol A) 12.28 B) 6.41 C) 9.40 D) 7154 E) 13.16 |
13.16 |
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which one of the following substances is more likely to dissolve in benzene A) NaCLL B) CCL4 C) NH3 D) HBr |
CCl |
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calculate the molality of a 17.5%(by mass) aq solution of nitric acid. A) 0.278 B) 3.37 C) 2.78 D) 0.212 E)the density of the solution is needed to solve. |
3.37
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which one of the following processes produces a decrease of the entropy of the system? A) sublimation of naphthalene B) dissolving sodium chloride in water C) dissolving oxygen in water D) explosion of nitroglycerine E) boiling od alcohol |
dissolving oxygen in water |
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if delta G for a reaction is greater than zero, then____. A) K=1 B) K=0 C) K>1 D) K<1 E) more information is needed |
K<1 |
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delta S is positive for the reaction _____. A) C3H8+ 5O2--> 3CO2+4H2O B) 2NO+O2-->2NO C) C2H4+H2-->C2H6 D) 2N2+3H2-->2NH3 |
A) C3H8+ 5O2--> 3CO2+4H2O
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which of the following expressions is the correct equilibrium-constant expression for the equilibrium between dinitrogen tetroxide and nitrogen dioxide? N2O4-->2No2 A) [NO2]^2/[N2O4] B) [NO2]/[N2O4]^2 C) [NO2][N2O4] |
A) [NO2]^2/[N2O4]
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the Keq for the equilibrium below is 5.4X10^13 @ 480.0C 2NO+2O2<--> 2NO2 what is the value of Keq at this temperature for the following reaction? 4NO+2O2<--> 4NO2 A) 1.9X10^12 B) 2.9X10^27 C) 1.9X10^-12 D)5.4X10^-13 |
2.9X10^27
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The equilibrium constant for the gas phase reaction 2NH3<--> N2+3H2 is Keq= 230 @300C. at equilibrium,_____> A) reactants predominate B) roughly equal amounts of product to reactant C) only reactant D) only Product E) products predominate |
products predominate |
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Accoriding to the arrhenius concept, an acid is a substance that ____. A) taste bitter. B) is capable of donating one or more H+ C) can accept a pair of electron to form coordinate covalent bond D)reacts with solvent to form cation E) causes an increase in the concentration of H+ in aq solution. |
causes an increase in the concentration of H+ in aq solution.
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a bronsted-lowry acid is defined as a substance that____. A) acts as a proton donor B) increases [OH] when placed in H2O C) acts as a proton acceptor D) decreases [H+] when placed in H20 |
acts as a proton donor
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in which of the following aq solution does the weak acid exhibit the highest percentage ionization? A) 0.01M HC2H3O2 ka=1.8X10^-5 B) 0.01M HClO ka= 3.0X10^-8 C) 0.01M HNO2 ka=4.5X10^-4 D) 0.01M HF ka= 6.8X10^-4 E) these will all exhibit the same % ionization. |
D) 0.01M HF ka= 6.8X10^-4
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the Ka of hydrofluoric acid (HF) at 25.0C is 6.8X10^-4. what is the pH os a 0.15M aq solution of HF? A) 1.17 B) 4.60 C) 2.00 D) 3.64 E) 0.82 |
2.00 |
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a solution containing which one of the following pairs of substances will be a buffer solution? A) CsI, HI B) CuCl, HCl C) AgBr, HBr D) KI,HI E) none of the above |
none of the above |
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The Henderson-Hasselbalch equation is_____. A) pH=pKa+log [base]/[acid] B) pH=pKa-log [base]/[acid] C) pH=log [acid]/[base] D)pH=pKa+log[acid]/[base] |
pH=pKa+log [base]/[acid]
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the hydration of cations in solution is due largely to which interaction? A) dispersion forces B) ion-ion C) dipole-dipole D) ion- dipole |
ion-dipole |
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which molecule experiences dispersion forces only? A) HCL B) H2Se C) H2O D) P4 E) HF |
P4 |
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which of the following is an electrolyte when dissolved in water? A) NaNO3 B) C2H5OH C) sugar D) N2 E) Ar |
NaNO3 |
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in what direction does removal of H2 from the equilibrium shown shift the equilibrium? H2g+I2g<--> 2Ig |
left |
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in what direction does addition of (NH4)2S to the equilibrium shown shift the equilibrium ? H2Sg+ 2NH3g<-->(NH4)2S(s) |
no effect |
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what is the bronzed acid in the reaction H2S+2NH3<--> (NH4)2S? |
H2S |
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what is the lewis base in the reaction: H2S+2NH2<--> (NH4)2S |
NH3 |
