• Home
  • Blog
  • Thermochemistry & Intermolecular Forces/Liquids/Solids EXAM Need within 60 minutes to 70 minutes

Thermochemistry & Intermolecular Forces/Liquids/Solids EXAM Need within 60 minutes to 70 minutes

0 comments

***Exam – please take, only have to show work begining question 30

1.The sign of ΔH for an endothermic process is ___, because it________

Group of answer choices

negative, gives off heat to the surroundings

positive, gives off heat to the surroundings

negative, absorbs heat from the surroundings

positive, absorbs heat from the surroundings

2.The sign of ΔH for an exothermic process is ___, because it________

Group of answer choices

3.At constant pressure, the sign of q for the process CO2(g) => CO2(s) is____, because______

Group of answer choices

4.At constant pressure, the sign of q for the process CH4(l) => CH4(g) is____, because______

Group of answer choices

5.If 20.00 mol of hydrogen gas completely reacted with 20.00 mol of chlorine gas at constant pressure, releasing 3700 kJ of heat, which of the following thermochemical equations is correct?

Group of answer choices

H2(g) + Cl2(g) => 2HCl (g); ΔH° = +185 kJ

6.Consider the reaction:

2Fe(s) + 3/2O2(g) => Fe2O3(s); ΔHo= –824.2 kJ

Find ΔH for the following reaction.

2Fe2O3(s) => 4Fe(s) + 3O2(g)

Group of answer choices

Flag this QuestionQuestion 72 pts

7.Considering the limiting reactant, how much heat is produced at constant pressure if 0.243 g of magnesium reacts with 100.0 mL of 0.300 M HCl according to the reaction below?

Mg(s) + 2HCl(aq) => MgCl2(aq) + H2(g); ΔHo = –462.5 kJ

Group of answer choices

6.94 kJ

4.63 kJ

8.A 0.1018 g sample of organic compound with a molar mass of 225.4 g/mol was burned in the bomb calorimeter with the heat capacity 2.95 kJ/K. The temperature in the calorimeter increased by 2.63 K. Calculate the energy of combustion of the compound in kJ/mol.

Group of answer choices

–1.78 x 102

–1.72 x 104

Flag this QuestionQuestion 92 pts

9.Which of the following equations is related to the standard enthalpy of formation of solid zinc nitrate?

Group of answer choices

Zn(s) + 2HNO3(aq) => Zn(NO3)2(s) + H2(g)

ZnO(s) + 2NO2(g) + O2(g) => Zn(NO3)2(s)

Flag this QuestionQuestion 102 pts

10.The following combination of signs for heat and work (respectively) represents a system that is gaining heat from the surroundings and doing work on the surroundings?

Group of answer choices

Flag this QuestionQuestion 112 pts

11.The following is correct for the chemical reaction taking place at constant pressure:

Group of answer choices

ΔH = ΔE + P ΔV

Flag this QuestionQuestion 123 pts

12.The following phase change is exothermic:

Group of answer choices

Flag this QuestionQuestion 133 pts

13.If you remove some water from an of an ice-water mixture,

Group of answer choices

the temperature of an ice-water mixture will not change

Flag this QuestionQuestion 142 pts

14.The vapor pressure of a liquid will increase with the increase in the following:

Group of answer choices

Flag this QuestionQuestion 152 pts

15.In which of the following substances the molecules will have only London dispersion forces? (Hint check the shape and polarity of the molecules)

Group of answer choices

Flag this QuestionQuestion 162 pts

16.In which of the following substances the molecules will have dipole-dipole interactions as their strongest intermolecular interaction? (Hint check the shape and polarity of the molecules)

Group of answer choices

Flag this QuestionQuestion 172 pts

17.In which of the following substances the molecules will not have hydrogen bonding as their strongest intermolecular interaction? (Hint check the shape and polarity of the molecules)

Group of answer choices

Flag this QuestionQuestion 183 pts

18.The following intermolecular forces exist between the molecules of water and ethanol (CH3CH2OH):

Group of answer choices

Flag this QuestionQuestion 193 pts

19.The following intermolecular forces exist between the particles in the aqueous solution of NaCl

Group of answer choices

Flag this QuestionQuestion 202 pts

20.Which substance in the liquid state has only dipole-dipole and hydrogen bonding?

Group of answer choices

Flag this QuestionQuestion 213 pts

21.The following intermolecular forces exist between the particles in the solid sulfur dioxide (check the Lewis dot structure and polarity):

Group of answer choices

Flag this QuestionQuestion 223 pts

22.The following is an explanation of the higher boiling of HF compared to HCl

Group of answer choices

Flag this QuestionQuestion 232 pts

23.Which of the following pure substances has the lowest vapor pressure?

Group of answer choices

Flag this QuestionQuestion 243 pts

24.The value of the following will decrease with the decreasing of the strength of the intermolecular forces:

Group of answer choices

Flag this QuestionQuestion 252 pts

25.On the generic phase diagram below, the gas is present at the temperatures and pressures which are the coordinates of the following points:

Phase Diagram1.jpg

Group of answer choices

Flag this QuestionQuestion 262 pts

26.On the generic phase diagram below, the change from point E to point F describes:

Phase Diagram1.jpg

Group of answer choices

Flag this QuestionQuestion 272 pts

27.On the generic phase diagram below, the solid-gas equilibrium is represented by the segment:

Phase Diagram1.jpg

Group of answer choices

Flag this QuestionQuestion 282 pts

28.On the generic phase diagram below, the equilibrium between solid, liquid and gaseous states is represented by the letter :

Phase Diagram1.jpg

Group of answer choices

Flag this QuestionQuestion 292 pts

29.On the generic phase diagram below, ΔHovaporization is represented by the segment:

Heating Curve.jpg

Group of answer choices

Flag this QuestionQuestion 306 pts


SHOW WORK FOR CREDIT FROM HERE DOWN

30.Standard Enthalpies of Formation, in kJ/mol

N2(g) 0 NO2(g) +33.2 NH3(g) -45.9 H2O(l) -285.8

NO(g) +90.3 N2O(g) -82.1 H2O(g) -241.8

Use the data above to calculate ΔH for the reaction: (8 points)

6 NO2(g) + 8 NH3(g) => 7 N2(g) + 12 H2O(g) ΔH = ?

31.Use the standard enthalpy of formation of iron(III) chloride ( -334.0 kJ/mol) to calculate the amount of heat that will be produced by the reaction in which iron(III) chloride will be produced from 100.0 g of iron in excess chlorine gas.

SHOW WORK FOR CREDIT

32.Use the Hess’s law to calculate the enthalpy of reaction for

3 NO2(g) + H2O(l) => 2 HNO3(aq) + NO(g)
from:

4 HNO3(aq) => 4 NO2(g) + 2 H2O(l) + O2(g) ΔH = +390.3 kJ

and 2 NO2(g) => 2 NO(g) + O2(g) ΔH = +114.2 kJ

SHOW WORK FOR CREDIT

33.The reaction between 0. 5051g NaOH and 200.0 mL diluted sulfuric acid solution (the excess reagent) was performed in the coffee cup calorimeter:

2 NaOH(s) + H2SO4 (aq) => Na2SO4 (aq) + 2H2O(l)

Calculate ΔHrxn in kJ/molNaOH, if the temperature was raised from 22.25oC to 32.65oC.

Assume heat capacity of solution 4.182J/oC g and density of solution 1.00 g/mL

SHOW WORK FOR CREDIT

About the Author

Follow me


{"email":"Email address invalid","url":"Website address invalid","required":"Required field missing"}