CHM 103 Exam+1+Review PDF

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CHM 103 Supplemental Instruction Exam 1 Review Questions 1. Which of the following depicts a chemical process? a. Helium is combined with neon. b. Iron forms rust c. Water causes soil erosion d. Ice melts 2. Which of the following is a heterogeneous mixture? a. sodium chloride d. rice and beans c. magnesium sulfate d. water 3. If it is 90°F, approximately what temperature is it on the Celcius scale? a. 18°C b. 32°C c. 58°C d. 104°C 4. In degrees Kelvin, the freezing point of water is: a. -273° b. 0° c. 100° d. 273° 5. If the temperature is 25°C, what is the temperature in °F? a. 25°F b. 298°F c. 0°F d. 77°F 6. How millimeters are there in one centimeter? a. 10,000 b. 1,000 c. 100 d. 10

7. One millimeter contains how many µm? a. 10 b. 100 c. 1,000 d. 10,000 8. The quantity 6,180 meters can be rewritten as: a. 6.180 x 103 m b. 6,180 km c. 6,180 x 103 m d. 180 x 103 m 9. Convert 4.50 x 102 nm into meters. a. 4.50 x 102 m b. 4.50 x 1011 m c. 4.50 x 10-7 m d. 4.50 x 108 m 10. Using the correct number of significant figures and solve the following equation: (27 + 93) x 5.1558 = a. 618.697 b. 618.7 c. 619 d. 618.6970 11. The percentage of oxygen by weight in Al2(SO4)3 is approximately: a. 19 b. 21 c. 56 d. 92 12. The density of gold (Au) is 19.3 g/cm 3 and that of iron (Fe) is 7.9 g/cm3. A comparison of the volumes (V) f 50 gram samples of each metal show: a. VAu = VFe b. VAu < VFe c. VAu > VFe d. there is no predictable relationship between volumes

13. The symbol K on the periodic table stands for a. potassium b. calcium c. carbon d. phosphorus 14. Which of the following substances is a chemical compound? a. blood b. water c. oxygen d. air 15. Chlorine-34 has: a. 17 protons, 17 electrons, and 17 neutrons b. 17 protons, 19 electrons, and 17 neutrons c. 17 protons, 18 electrons, and 17 neutrons d. 34 protons, 34 electrons, and 17 neutrons 16. Copper (Cu) has an atomic number of 29 and a mass number of 64. One copper atom, therefore, has how many protons? a. 27 b. 29 c. 31 d. 35 17. An atom with an atomic number of 58 and an atomic mass of 118 has: a. 58 neutrons b. 176 neutrons c. 60 neutrons d. 116 neutrons 18. What is the molar mass of NaHCO3? a.102 b. 84 c. 56 d. 75 19. How many grams are contained in 0.400 mol of calcium phosphate Ca 3(PO4)2? a. 12.4 b. 31.0 c. 124 d. 62.0

20. How many moles are contained in 54.0 g sample of Sn? a. 1.0 b. 4.0 c. 0.45 d. 2.0 21. What does the number 36 represent on the periodic table entry for krypton? a. atomic number b. relative atomic mass c. group number d. electron configuration

Symbol

Atomic Number

Isotope Weight

Au

Number of Electrons

Number of Neutrons 116

62 19

34

56

Using the above table, answer the following questions 22. Which of the following corresponds with the numbers that should be in row 1 of the table: a. 79, 195, 79 b. 79, 197, 79 c. 79, 116, 37 d. 37, 116, 37 23. Which of the following corresponds with the numbers that should be in row 2 of the table: a. Se, 34, 34 b. Ni, 28, 28 c. Ni, 34, 34 d. Se, 28, 28 24. Which of the following corresponds with the numbers that should be in row 3 of the table: a. Rb, 19, 37 b. K, 56, 37 c. K, 19, 37 d. K, 19, 21

25. Calculate the atomic weight of Chemistrium, an imaginary element, on the basis of the following percent composition and atomic weights of the naturally occurring isotopes. chemistrium-100 = 69.09% (100.143 u) chemistrium-97 = 30.91% (96.984 u) a. 99.17 u b. 100.143 u c. 96.984 u d. 101.5 u...