1. Which of the following wavelengths has the highest energy per photon? a. 100 nm b nm c nm d nm

Transcription

1 Multiple Choice 1. Which of the following wavelengths has the highest energy per photon? a. 100 nm b nm c nm d nm 2. With respect to mass, what is the correct ranking of a proton, neutron, and electron? a. p + < n o < e - b. e - < n o < p + c. n o < p + < e - d. e - < p + < n o 3. Which of the following electronic transitions within the hydrogen atom will NOT emit a photon within the visible range? a. n 6 n 2 b. n 8 n 2 c. n 2 n 3 d. n 3 n 1 4. Rounding to two significant figures would result in the following. a b. 280 c. 290 d Which of the following shows an accurate representation of a balloon filled with hydrogen and oxygen? a b c d 6. Which of the following compounds will not form? a. CuCl b. CuCl 2 c. Mg(OH) 2 d. CaNO 3 7. Which of the following data sets show the most precision? The accepted value for these measurements is 1.31 g/ml a g/ml, 1.31 g/ml, 1.41 g/ml b g/ml, 1.41 g/ml, 1.51 g/ml c g/ml, 1.52 g/ml, 1.53 g/ml d g/ml, 1.25 g/ml, 1.29 g/ml

2 8. What is the charge of X in the following compound, X 2 CO 3? a. 1+ b. 2+ c. 1- d Which of the following are molecules? a. Na b. CH 4 c. MgCl 2 d. N According to Coulomb s Law a. The energy between two oppositely charged particles decreases as the distance between them increases. b. The energy between two oppositely charged particles decreases as the distance between them decreases. c. The energy between two like charged particles decreases as the distance between them increases. d. The energy between two like charged particles decreases as the distance between them decreases. True/False grams of 12 C contains more atoms than 1.00 grams of 13 C. 2. Hg 2 O 2 contains mercury (I) ions. 3. The location of the arrow indicates a point where the two waves are adding together constructively. Light Light 4. According to the mixture (of carbon and hydrogen) shown below, a maximum of four methane (CH 4 ) molecules can form. 5. Energy is released when a bond is broken 6. Using the periodic table provided with the exam, the molar mass of glucose (C 6 H 12 O 6 ) should be reported as grams. 7. Isotopes of the same element differ in the number of protons within the nucleus.

3 8. According to the diagram below, light source B has a higher frequency than light source A. A B 9. Thallium consists of two stable isotopes ( 203 Tl and 205 Tl). The mass of 203 Tl and 205 Tl are amu and amu respectively. Naturally occurring Thallium is composed of a higher percentage of 205 Tl than 203 Tl. 10. The discovery of the electron by JJ Thomson preceded the discovery of the nucleus by Ernest Rutherford. Short Answer (Make sure to check your significant figures and box your answers) 1. Complete the following table with the proper formula for each combination. (4.5) NO 3 - O 2 2- PO 4 3- NH 4 + Cu 2+ Al Complete the following table. (3.5) Isotopic Symbol Number of Protons Number of Neutrons Number of Electrons 123 Sb Ca 2+

4 3. Determine the change in energy of an electron as it falls from n 6 n 3 within the hydrogen atom. (4) 4. Determine the mass of aluminum present in grams of Al 2 S 3? (4) 5. A sample contains 4.731x10 24 molecules of fluorine. Determine the number of electrons present in this sample? (3)

5 6. Boron has two stable isotopes; 10 B (mass = amu) and 11 B (mass amu). Determine the percent of naturally occurring 10 B? (4) 7. An electron within the hydrogen atom has an energy of x10-21 J relative to n. Determine the energy level of this electron? (4) 8. By mass, the average human body is made up of 18.5% carbon. Calculate the number of carbon atoms in my eleven-year-old daughter who has a mass of 68.5 pounds (3.11x10 4 grams). Assume she is an average human for the purposes of this problem. (5)

6 9. A photon emitted from a hydrogen lamp has a wavelength of nm. The electron has fallen from an initial energy level (n i ) to n 3. Using the Rydberg Equation determine the electron s initial energy level? (5) 10. The following object has a mass of grams. Calculate the density (in g/cm 3 ). (4) 4.01 in 2.99 in 0.80 in 11. The melting temperature of gold is F. What is the melting temperature of gold reported in degrees Celsius? (4)

7 12. Complete the following table with the proper name. (3) Name NH 4 NO 3 Cu 2 CO 3 Mg(OH) The energy required to break the bond between two chlorine atoms in a chlorine molecule is 4.03x10-22 J. Calculate the energy required to break every bond within moles of chlorine. (4) 14. A sample of an iron oxide sample contains grams of iron ad grams of oxygen. Determine the empirical formula of the iron oxide product. (5)