Arts and Sciences Program Chemistry Department Chemistry Placement Test 2013 Sample Test These questions are only a guide and are NOT the actual questions from the Chemistry Placement Test. The answers are at the end of the document. Chemistry Placement Test Date: Monday the 21st of January, 2013 Time: 11:00 o’clock sharp Place: To be announced 1 Chemistry Placement Test – Sample Circle one answer only (A, B, C, D or E) for each multiple choice question. 1. Condensation refers to which conversion? A. solid → gas B. solid → liquid C. gas → liquid D. gas → solid E. liquid → gas 2. Which one of these represents a chemical change? A. boiling water to form steam B. burning a piece of paper C. melting butter D. mixing sand and salt in a beaker E. cutting a bar of sodium metal into pieces with a knife 3. Which of the following is not an SI unit? A. Mole B. Liter C. Kilogram D. Second E. Kelvin 2 4. How many significant figures does the product 8.52010 × 7.9 contain? A. 2 B. 3 C. 4 D. 5 E. 6 5. The diameter of an atom is approximately 1 × 10-8 cm. What is this diameter when expressed in nanometers? A. 1 × 10-19 nm B. 1 × 10-15 nm C. 1 × 101 nm D. 1 × 10-10 nm E. 1 × 10-1 nm 6. Calculate the mass of the air contained in a room that measures 2.50 m × 5.50 m × 3.00 m (density of air = 1.29 g/dm3 at 25°C). A. 3.13 × 10-5 g B. 32.0 kg C. 53.2 kg D. 53.2 g E. 32.0 g 3 7. 6.0 km is how many micrometers? A. 6.0 × 106 µm B. 1.7 × 10-7 µm C. 6.0 × 109 µm D. 1.7 × 10-4 µm E. 6.0 × 103 µm 8. Which of the following is a mixture? A. sulfur B. air C. carbon dioxide D. nitrogen E. salt 9. Which of the following subatomic particles has a neutral charge? A. alpha particle B. electron C. nucleus D. neutron E. proton 10. Atoms of the same element with different mass numbers are called A. Ions. B. Neutrons. C. Allotropes. D. Chemical families. E. Isotopes. 4 11. Which of these elements is chemically similar to Chlorine? A. sulfur B. oxygen C. fluorine D. argon E. sodium 12. Which of these pairs of elements would be most likely to form a molecular compound? A. Na and Br B. Ca and K C. C and O D. Cu and O E. Al and Rb 13. An aluminum ion, Al3+, has: A. 13 protons and 13 electrons B. 27 protons and 24 electrons C. 16 protons and 13 electrons D. 13 protons and 10 electrons E. 10 protons and 13 electrons 14. Which is the correct formula for copper(II) nitrate? A. Cu2NO3 B. CuNO3 C. Cu(NO2)2 D. Cu(NO3)3 E. Cu(NO3)2 5 15. Vanadium is a transition metal. The name for VSO4 should be A. Vanadium sulfide. B. Vanadium(I) sulfite C. Vanadium(I) sulfate D. Vanadium(II) sulfate E. Vanadium sulfur tetroxide 16. The formula C5H12 represents which alkane A. pentane B. propane C. hexane D. butane E. methane 17. The atomic masses of two isotopes of chlorine 35 Cl (75.8%), 37Cl (24.2%), are 34.969 amu and 36.966 amu respectively. Calculate the average atomic mass of chlorine? A. 35.45 amu B. 70.90 amu C. 63.25 amu D. 35.97 amu E. 36.00 amu 6 18. How many silicon atoms are there in 1.00 g of silicon? A. 1 atom B. 0.0356 atoms C. 2.57 × 1023 atoms D. 2.14 × 1022 atoms E. 1.75 × 1025 atoms 19. What is the mass of 0.0250 mol of P2O5? A. 35.5 g B. 5676 g C. 0.0250 g D. 1.51 × 1022 g E. 3.55 g 20. What is the number of moles in 36.8g of Nickel? A. 1.59 mols B. 0.627 mols C. 3.18 mols D. 0.314 mols E. 1.00 mols 7 21. The empirical formula of a compound of uranium and fluorine that is composed of 67.6% uranium and 32.4% fluorine is A. U2F B. U3F4 C. UF4 D. UF6 E. UF8 22. When balanced with the smallest set of whole numbers, the coefficient of O2 in the following equation is: __ C2H4 + __ O2 → __ CO2 + __ H2O A. 1. B. 2. C. 3. D. 4. E. 6. 23. How many grams of silver nitrate are necessary to react completely with 7.000 moles of copper? Cu + 2 AgNO3 → Cu(NO3 )2 + 2 Ag A. 170g B. 1189g C. 350g D. 1510g E. 2379g 8 24. A sample of C6H12O6 contains 24.0g of carbon. Calculate the number of grams of oxygen in the sample? A. 170g B. 32.0g C. 350g D. 64.0g E. 96.0g 25. Three students measure the density of copper (density of copper 8.92g/cm3) and obtain the following results: Student A 7.99 g/cm3 7.98 g/cm3 8.01 g/cm3 Student B 8.91 g/cm3 8.90 g/cm3 8.92 g/cm3 Student C 6.50 g/cm3 6.90 g/cm3 7.20 g/cm3 Which student is precise but not accurate? A. B. C. D. E. Students A and B Student A Student C Student B Students B and C 9 ANSWER KEY to the above questions Sample Question Correct Answer Sample Question Correct Answer 1 C 16 A 2 B 17 A 3 B 18 D 4 A 19 E 5 E 20 B 6 C 21 D 7 C 22 C 8 B 23 E 9 D 24 B 10 E 25 B 11 C 12 C 13 D 14 E 15 D 10