Timothy SubrahmanyamSpring 2018 – Study Union

Study Union Spring 2018

Live Streamed Final Exam Review for Chemistry IB (CHM 2041)

Tuesday, April 24 th , 2018

11AM – 1PM

By Timothy Subrahmanyam

This review document is on https://ucfstudyunion.wordpress.com/chemistry-2/

A video of this review can be found on UCF SARC YouTube

Credit to Laura Sawires for some of the problems found in this review.

**Many questions are taken from actual past ACS USNCO exams.1.

Timothy SubrahmanyamSpring 2018 – Study Union

2.

Concept:

XZA

A = mass number = number of proton + neutrons

Z = atomic number = number of protons

X = chemical symbol

3.

Concept:

AtomicMass=∑ (fraction of isotopes )∗(mass of isotopes )

Timothy SubrahmanyamSpring 2018 – Study Union

4.

5.

6.A 30.5 gram sample of glucose (C6H12O6) contains __________ atoms of carbon.A) 1.02 x 1023B) 6.12 x 1023C) 6.02 x 1023D) 2.04 x 1023E) 1.22 x 1024

7.

What is the mass % of carbon in dimethylsulfoxide (C2H6SO) rounded to three significant figures?

Timothy SubrahmanyamSpring 2018 – Study Union

A) 60.0B) 20.6C) 30.7D) 7.74E) 79.8

8.

9.

10.

Timothy SubrahmanyamSpring 2018 – Study Union

For the following reaction, which element was oxidized and reduced, and determine the oxidizing and reducing agent.

I– + CrO42− → Cr3+ + I2

Concept:

Timothy SubrahmanyamSpring 2018 – Study Union

Lithium and nitrogen react to produce lithium nitride:

6Li (s) + N2 (g) → 2Li3N (s)

How many moles of lithium nitride are produced when 0.400 mol of lithium react in this fashion?A) 0.133B) 0.800C) 0.0667D) 1.20E) 0.200

12.

Which of the following is insoluble in water at 25 °C?A) Mg3(PO4)2B) Na2S

C) (NH4)2CO3D) Ca(OH)2E) Ba(C2H3O2)2

13.

Which combination will produce a precipitate?A) NH4OH (aq) and HCl (aq)B) AgNO3 (aq) and Ca(C2H3O2)2 (aq)C) NaOH (aq) and HCl (aq)D) NaCl (aq) and H C2H3O2 (aq)E) NaOH (aq) and Fe(NO3)2 (aq)

Concept:

Timothy SubrahmanyamSpring 2018 – Study Union

14.

Timothy SubrahmanyamSpring 2018 – Study Union

15.

The density of NO2 in a 3.50 L tank at 780.0 torr and 37.0°C is __________ g/L.A) 1.64B) 9.30C) 1.86D) 2.92E) 3.27

16.Arrange the following gases in order of increasing average molecular speed at 25°C.

Cl2, O2, F2, N2

A) Cl2 < F2 < O2 < N2B) Cl2 < O2 < F2 < N2C) N2 < F2 < Cl2 < O2D) Cl2 < F2 < N2 < O2E) F2 < O2 < N2 < Cl2

17.

An ideal gas differs from a real gas in that the molecules of an ideal gas __________.A) have no attraction for one anotherB) have appreciable molecular volumes

Timothy SubrahmanyamSpring 2018 – Study Union

C) have a molecular weight of zeroD) have no kinetic energyE) have an average molecular mass

Concept:

Kinetic Molecular Theory1. The size of a particle is negligibly small.2. The average kinetic energy of a particle is proportional to the temperature in kelvins3. The collision of one particle with another (or with the walls of its container) is completely elastic

18.

10.0 grams of argon and 20.0 grams of neon are placed in a 1200.0 ml container at 25.0°C. The partial pressure of neon is __________ atm.

A) 20.4B) 8.70C) 0.700D) 3.40E) 5.60

19.

The reaction

4Al (s) + 3O2 (g) → 2 Al2O3 (s) ΔH° = -3351 kJis __________, and therefore heat is __________ by the reaction.A) endothermic, releasedB) endothermic, absorbedC) exothermic, releasedD) exothermic, absorbedE) thermoneutral, neither released nor absorbed

20.

Timothy SubrahmanyamSpring 2018 – Study Union

21.

22.

Of the following, __________ radiation has the longest wavelength and __________ radiation has the greatest energy.

gamma ultraviolet visible

A) ultraviolet, gammaB) visible, ultravioletC) gamma, gammaD) visible, gammaE) gamma, visible

23.

What color of visible light has the highest energy?A) violetB) blueC) redD) greenE) yellow

Timothy SubrahmanyamSpring 2018 – Study Union

Concept:

24.

The wavelength of a photon that has an energy of 6.33 × 10-18 J is __________ m.A) 3.79 × 10-7

B) 3.10 × 10-8

C) 2.38 × 1023

D) 4.21 × 10-24

E) 9.55 × 1015

25.

The wavelength of light that has a frequency of 1.20 ×1013s-1 is __________ m.A) 25.0B) 2.50 × 10-5C) 0.0400D) 12.0E) 2.5

Timothy SubrahmanyamSpring 2018 – Study Union

26.

27.

28.

29.

Timothy SubrahmanyamSpring 2018 – Study Union

30.

Timothy SubrahmanyamSpring 2018 – Study Union

31.

32.

33.

Timothy SubrahmanyamSpring 2018 – Study Union

Timothy SubrahmanyamSpring 2018 – Study Union

Timothy SubrahmanyamSpring 2018 – Study Union

Answers to Problems:

1. D2. B3. C4. A5. C6. B7. C8. B9. A10. Reduced: CrO4

2- Oxidized: I-

Ox. Agent: CrO42- Red. Agent:

I-

11. A12. A13. E14. D

15. C16. A17. A18. A19. C20. A21. A22. D23. A24. B25. B26. D27. D28. B29. A30. B31. C32. A33. A