)Chem 211 - Midterm Exam

1. 3.7 x 10-24g = _____ kg a) 3.7 x 10-21 b) 3.7 x 10-22 c) 3.7 x 10-26 d) 3.7 x 10-27 e) 3.7 x 10-30

2. The mass of 30 cm3 of mercury with a density of 13.6 g/cm3 is _____g. a) 4.1 b) 2.3

c) 0.45 d) 4.5 e) 408

3. How many electrons are there in one ion of Fe+3? a) 26 b) 23 c) 29 d) 3 e) -3

4. The formula of Iron (III) oxide is a) Fe3O b) FeO3 c) FeO3 d) Fe2O3 e) FeO

5. The mass of one molecule of SO2 is _____ g. a) 1.1 x 10-23 b) 1.1 x 10-25 c) 64 d) 3.84 x 1023 e) 1.1 x 10-22

6. A compound has the composition 56.4% P and 43.6% O. The empirical formula is a) PO2 b) P2 O c) P2 O4 d) P2 O5 e) P2 O3

7. What is the weight percent carbon in the compound C2 H4ON2 ? a) 33.3 b) 40.0 c) 46.7 d) 53.2 e) 64.7

8. 3L of a 0.25 molar solution contains _____moles of solute. a) 0.75 b) 0.083 c) 12 d) 3.5 e) 6.4

9. Which of the following sets of quantum numbers, given in the form (n, l, m ), is not possible? .

a) ( 1, 0, 0) b) (8, 3, 0) c) (5, 3, -3) d) (3, 0, 0) e) (3, 3, 1)

10. The weight of HCl present in 100 mL of a 6 molar solution is _____ g. a) 6 b) 10.8 c) 21.9 d) 36.5 e) 219

11. 4 moles of NH3would have what mass? a) 17 g b) 68 g c) 93 g d) 3.6 x 1025g e) 5 x 10-23g

12. 1 Joule is equal to a) 1 m/s b) 1 Kg m2/s2 c) 1 g m2/s d) 1 Kg m2 e) 1 g Km/s2

15. The element that most resemble Sn in its chemical properties is _____. a) In b) Sb c) As d) Pb e) Zn

16. What is the maximum number of electrons that can be put into the 3d subshell? a) 0 b) 3 c) 5 d) 6 e) 10

17. How many unpaired electrons are there in one atom of oxygen (in its ground state configuration)? a) 0 b) 1 c) 2 d) 3 e) 4

18. Which of the elements listed has the largest atomic radius? a) Ni b) Ar c) Pb d) Cs e) Na

19. Which of the second period elements has the highest ionization potential? a) Li b) C c) O d) F e) Ne

20. The family of elements with the electron configuration [noble gas] ns2 is a) alkal metals b) alkali earth metals c) oxygen family d) halogens e) noble gases

21. How many electrons are there in the valence shell of Bi? a) 2 b) 3 c) 5 d) 10 e) 15

22. Which of the following is an ionic compound? a) F2O b) H2S c) CaO d) CO2 e) NF3

23. Which of the following is largest in size? a) Fe+3 b) Se--2 c) Kr d) Rb+1 e) Sr+2.

24. How many unpaired electrons would there be in the ground state of Ni+2? a) 0 b) 1 c) 2 d) 3 e) 4

25. The total number of valence electrons in HCN is _____. a) 14 b) 12 c) 10 d) 8 e) 6

28. The man associated with explaining the energy distribution of black body radiation was a) Plank b) Einstein c) Rutherford d) Chadwick e) Lewis

29. Bonding that occurs as a result of transfer of electrons is called __________ bonding. a) covalent b) pair c) ionic d) octet e) none of these

30. What is the empirical formula of an organic compound that has a composition 60.0% C, 13.4% H and 26.6% O? a) C3H8O b) C6H4O3c) C5H13O2 d) C5H13O e) C8H2O

31. What is the energy of a photon of light that has a frequency of 6 x 1014sec-1?a) 4 x 10-36J b) 1.1 x 10-20J c) 4 x 10-19J d) 0.9 x 10-20J e) 4.5 x 10-22J

32. How many orbitals are there in the 4f subshell of Pb? a) 1 b) 2 c) 4 d) 5 e) 7

33. A carbon atom is in a state with an electron configuration 1s22s22p2with two unpaired electrons. This state is a) impossible because it violates the Pauli exclusion principle b) impossible because it violates Hunds rule c) impossible because it violates the Hiesenberg uncer- tainty principle d) is the ground state of C e) is an excited state of C

34. What weight of NH3 can be produced from 3 g of H2 reacting with 200 g of N2? N2 + 3 H2 = 2NH3 a) 17 g b) 203 g c) 243 g d) 34 g e) 8.5 g

35. Which pair of elements is most likely to form an ionic compound? a) Cl and S b) K and Ni c) H and Se d) Na and I e) Ar and F