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Sample Exam #1 Part One: Multiple Choice – circle one answer only. 1. When methane is burned with oxygen, the products are carbon dioxide and water. If you produce 36 g of water and 44 grams of carbon dioxide from 16 grams of methane, how many grams of oxygen were needed for the reaction? a) 64 g b) 80 g c) 32 g d) 96 g 2. Which of the following is not composed of chemicals? a) air b) water c) paint thinner d) toilet paper e) all of the above are composed of chemicals 3. Which of the following is a Type I binary ionic compound? a) NaCl b) FeCl3 c) CO2 d) All of the above e) None of the above 4. Which of the following is a theory? a) When a can of soda pop is opened, a fizzing sound is heard. b) A body in motion stays in motion unless acted upon by a force. c) If oil and water are combined, the oil floats on top of the water. d) Chemical bonds are the result of overlapping atomic orbitals. e) None of the above. 5. Which of the following is used to convert Fahrenheit to Celsius? a) ºC = ºF +273 b) ºC = F – 32 1.80 c) ºC = ºF – 273 d) ºC = ºF(1.80) + 32 6. How does the amount of energy needed to heat a sample of water from 15 ºC to 45 ºC compare to that needed to heat this sample from 50 ºC to 80 ºC ? a) more energy is needed to go from 15 ºC to 45 ºC. b) it depends on the size of the sample c) the same amount of energy is involved d) more energy is needed to go from 50 ºC to 80 ºC Part Two: Short Answer 7. Describe the composition of an atom. 8. Explain the difference between a theory, law, and observation. 9. Express the following number in scientific notation and write the correct number of significant figures. 0.00000007850 m 10. Give the names of the following compounds: a) NaC2H3O2 __________________ b) SO4 __________________ c) HgCl2 __________________ d) Co2S3 __________________ 11. Classify each of the following as an alkali metal, alkaline earth metal, halogen, or noble gas. a) barium _________________ b) krypton _________________ c) potassium _________________ d) chlorine _________________ 12. What are the A and Z terms of the following elements? a) Rn-222 A: _______ Z:_________ b) Ag-108 A: _______ Z:_________ c) Rb-85 A: _______ Z:_________ d) Mg-25 A: _______ Z:_________ 13. Fill in the blanks to complete the table. Symbol Mass # # Protons # Neutrons 35 Cl 138 14 32 2S 32 16 # Electrons Charge 54 13 18 2+ 0 Part Three: Calculations – show all work. 14. Perform the following calculations to the correct number of significant figures. a) 83.5 + 7.212 + 1.2 + 400.34 b) 82.1 x 103 ÷ 75.829 + 218.39 c) 3.11 ÷ 7.65 d) 3.2 x 0.02040 x 0.599 15. Ethylene glycol (antifreeze) has a density of 1.11g/cm3. a) What is the mass in grams of 417 mL of this liquid? b) What is the volume in liters of 4.11 g of this liquid? 16. Calculate the formula mass of iron (III) nitrate to 3 significant figures. 17. A chemistry student finds a heavy piece of rock that she suspects is lead. She weighs the rock on a balance and obtains a mass of 27.6g. The temperature of the rock rises from 27ºC to 48ºC upon absorption of 208 J of heat. What is the heat capacity of the substance? Is this substance lead (heat capacity = 0.128 J/g ºC)?