1. Naturally occurring neon has average atomic mass of 20.18 amu and has two naturally occurring isotopes: :°Ne. 19.99 amw 'Ne. 21.99 amu. The percent abundances of the neon isotopes are _______% 20Ne and _____%22Ne.
A) 20.22 B) 4.5, 95.5 C) 95.5, 4.5 D) 90.5. 9.5 E) 9.5. 90.5
2. Magnesium and sulfur form an ionic compound with the formula A) NlgS: B) C) MgS I)) MO; EI Nig2S
3. Which of the following correctly lists the five atoms in order of increasing size? A)FD)F
4. Which ion below has the largest radius?
A) Cl' B) K+ C) Br- D) F- E) Na+
5. The value of ΔHo for the reaction below is -72 ___kJ of heat are released when 80.9 grams of HBr is formed in this reaction.
H2 (g) + Br2(g) → 2HI3r(g)
A) 144 B) 72 C) 0.44 D) 36 E) -72
6. A sample of aluminum metal absorbs 11.2 1 of heat. upon which the temperature of the sample increases from 23.2 t to 30.5 °C. Since the specific heat capacity of aluminum is 0 901 'g-K, the mass of the sample is g
A) 72 B) 1.7 0 10. 0)65 EI 7.3
7. Based on observed periodic trends. arrange the following species. tffir,11C1. III. 111. in order of increasing dipole moment.
A) HF < HCI < HBr < HI B)HBr < HCI < HE < HI C)Hl < HF < HCI < HBr
D) HI < HBr < HCI < HF E)HCI < HBr < HI < HF
8. Label the hybridization at C#1, C#2, C#3. and C#4 in the molecule.
0 H
| |
H-C ≡ C-C-C-H
1 2 3 | 4
H
C1 C2 C3 C4
A) sp sp sp3 sp3d
B) sp sp sp2 sp3
C) sp sp2 sp2 sp2
D) sp2 sp2 sp3 sp3
E) sp3 sp3 sp3 sp3
9. What is the energy of a mole of photons associated with light of viavelength 930 nm?
10. How many significant figure should be used in reporting the answers to the following:
a) 103 + 910.15
b) 0.0120 x 1010 / 1(100.50)(1.01139)1
11. The energy required for an electronic transition in a Rohr hydrogen atom from n = 2 to n = 3 is--------J.
12. Given the data in the table below, Calculate ΔHorxn in kJ for the reaction. Show your work.
3NO2 +H20(I) -> 2HNO3(aq)+NO(g)
Substance ΔHf (kj/mol)
H20 (1) -286
NO (g) 90
NO2 (8) 24
HNO3 (4:0 -207
t4H3 (g) -46