Supplemental Instruction:Chem177

Practice Exam III

April 2, 2009

1. Which of the following is a statement of Hess's law?

A) If a reaction is carried out in a series of steps, the ΔH for the reaction will equal the sum of the enthalpy changes for the individual steps.

B) If a reaction is carried out in a series of steps, the ΔH for the reaction will equal the product of the enthalpy changes for the individual steps.

C) The ΔH for a process in the forward direction is equal in magnitude and opposite in sign to the ΔH for the process in the reverse direction.

D) The ΔH for a process in the forward direction is equal to the ΔH for the process in the reverse direction.

E) The ΔH of a reaction depends on the physical states of the reactants and products.

2. Of the following transitions in the Bohr hydrogen atom, the ______transition results in the emission of the highest-energy photon.

A) n = 1 → n = 6

B) n = 6 → n = 1

C) n = 6 → n = 3

D) n = 3 → n = 6

E) n = 1 → n = 4

3. The n = 1 shell contains ______p orbitals. All the other shells contain

______p orbitals.

A) 3, 6

B) 0, 3

C) 6, 2

D) 3, 3

E) 0, 6

4. is the electron configuration of a(n) ______atom.

A) As

B) V

C) P

D) Sb

E) Sn

5. An electron cannot have the quantum numbers n = ______, l =

______, ml = ______.

A) 2, 0, 0

B) 2, 1, -1

C) 3, 1, -1

D) 1, 1, 1

E) 3, 2, 1

6. In general, as you go across a period in the periodic table from left to right:

(1) the atomic radius ______;

(2) the electron affinity becomes ______negative; and

(3) the first ionization energy ______.

A) decreases, decreasingly, increases

B) increases, increasingly, decreases

C) increases, increasingly, increases

D) decreases, increasingly, increases

E) decreases, increasingly, decreases

7. Which of the following is an isoelectronic series?

A)

B)

C) S, Cl, Ar, K

D)

E)

8. In the molecule below, which atom has the largest partial negative charge ?

A) Cl

B) F

C) Br

D) I

E) C

9. Which one of the following configurations depicts an excited oxygen atom?

A)

B)

C)

D)

E)

10. Of the following elements, ______has the most negative electron affinity.

A) Na

B) Li

C) Be

D) N

E) F

11. Of the following species, ______has the largest radius.

A)

B)

C)

D) Kr

E) Ar

12. A tin atom has 50 electrons. Electrons in the ______subshell experience

the lowest effective nuclear charge.

A) 1s

B) 3p

C) 3d

D) 5s

E) 5p

13. Which electron configuration denotes an atom in its ground state?

A)

B)

C)

D)

E)

14. In the Lewis symbol for a fluorine atom, there are ______paired and

______unpaired electrons.

A) 4, 2

B) 4,1

C) 2, 5

D) 6, 1

E) 0, 5

15. Given the electronegativities below, which covalent single bond is most polar?

Element: H C N O

Electronegativity:2.1 2.5 3.0 3.5

A) C-H

B) N-H

C) O-H

D) O-C

E) O-N

16. Given the data in the table below, for the following reaction is how

many kJ?

17. The bond length in an HI molecule is 1.61 Å and the measured dipole moment

is 0.44 D. What is the magnitude (in units of e) of the negative charge on I in

HI?

18. When the electron in a hydrogen atom moves from n = 8 to n = 2 light, what is

the wavelength of light emitted (in nm)?

19. What is the frequency of electromagnetic radiation that has a wavelength

of 0.53 m?

20. What is the wavelength (angstroms) of a photon that has an energy of

J?

21.Draw the Lewis structure for CH2O.

22. a) Write the complete electron configuration for a stable ion formed by a

calcium atom.

b) Write the complete electron configuration for a stable ion formed by an

oxygen atom.

23. a) Write the balanced equation for the reaction of potassium with water.

b) Write the balanced equation for the reaction of elemental fluorine with

water.

24. The de Broglie wavelength of an electron is . The mass of an

electron is . The velocity of this electron is ______m/s.