ChemCom Test Unit III A Petroleum Test # Choose the best answer for each of the questions below.

Transcription

1 ChemCom Test Unit III A Petroleum Test # Choose the best answer for each of the questions below. 1. Which products are commonly made from petroleum or petroleum byproducts. a. fry pans b. plastic sandwich bags c. gasoline d. clothes with synthetic fibers like polyester 2. Petroleum is considered a non-renewable resource because a. products like oil can t be recycled b. the bulk of the oil is burned at a rate faster than it forms c. it is difficult to obtain Use the diagram below to answer questions 3 and 4.

2 3. Where are most of the world s oil reserves located? a. S. America b. Africa c. Middle East d. N. America 4. Which area of the world must import petroleum to keep up with its rate of consumption? a. S. America b. Middle East c. Africa d. Western Europe

3 The diagram below shows a distillation apparatus. condenser w ater to sink distillate w ater from faucet 5. Which part of the apparatus is at the highest temperature? a. The liquid in the round flask. b. The vapor near the thermometer. c. The liquid dripping out of the condenser. 6. How does fractional distillation separate mixtures like crude oil? a. Different densities b. Different viscosities c. Different boiling points Use the table below to answer questions 7-8. Substance Boiling Point (deg C) 2-Propanol 82.4 Acetone 56.5 Cyclohexane 80.7 Water Which two liquids would be the easiest to separate using fractional distillation? (CHOOSE 2!) a. 2-Propanol b. Acetone c. Cyclohexane d. Water 8. Which two liquids would be the hardest to separate using fractional distillation? (CHOOSE 2!) a. 2-Propanol b. Acetone c. Cyclohexane d. Water

4 An original mixture contained 3 liquids, water, acetone and 2-propanol. After heating for several minutes a student noticed the temperature of the boiling flask was remaining steady at 82 degrees. The graph of the data is shown below. Substance Boiling Point (deg C) 2-Propanol 82.4 Acetone 56.5 Water What liquid could be dripping into the collection beaker 5 minutes into the experiment? a. Acetone b. 2-propanol c. Water 10. What liquid is completely distilled from the original mixture 12 minutes into the experiment? a. Acetone b. 2-propanol c. Water 11. What liquid has not yet boiled 15 minutes into the experiment? a. Acetone b. 2-Propanol c. Water

5 Figure 4 shows a picture of a fractionating tower used to distill and separate crude oil. Use the diagram to answer questions Where in the column would you find the lowest temperatures? a. A b. B c. C d. D A B C D 13. Where in the column would you obtain hydrocarbons with the shortest carbon chains? a. A b. B c. C d. D 14. Where in the column would you obtain hydrocarbons with the highest boiling points? a. A b. B c. C d. D 15. Which two elements make up the majority of petroleum? (Mark two!) a. hydrogen b. oxygen c. nitrogen d. carbon

6 The table below shows several hydrocarbons and their boiling points. Use the table to answer questions The Hydrocarbons are listed alphabetically. Hydrocarbon Boiling Point (deg C) Decane 174 Ethane Hexane 68.7 Methane Octane Pentane As the number of carbon atoms in a hydrocarbon decreases, the boiling point of the hydrocarbon a. increases. b. decreases. c. remains constant. 17. Which temperature would you predict for the boiling point of a hydrocarbon with 7 carbon atoms? a. 400 deg C b. 200 deg C c. 100 deg C d. 0 deg C 18. How many carbon atoms are there in an alkane that has a boiling point of 174 deg C? a. 1 b. 6 c. 8 d Which hydrocarbon shows the weakest intermolecular attractions? a. ethane b. pentane c. hexane d. decane

7 20. Is petroleum a renewable or non-renewable resource? a. renewable b. non-renewable c. petroleum is not a resource. 21. Using a periodic table, determine how many electrons are in a neutral atom of silicone? 22. How many electrons does a neutral atom of silicone have in the first energy level? 23. How many electrons does a neutral atom of silicone have in the second energy level? 24. How many valence electrons are found in a neutral atom of silicone? 25. How many electrons does silicone want to have in its valence energy level to become stable like Neon? 26. How many valence electrons does a neutral atom of Beryllium have? 27. When carbon atoms bond with hydrogen, the atoms share electrons. Bonds made with shared electrons are called a. covalent bonds. b. ionic bonds. c. James Bonds.

8 28. Which of the following formulas would have a molar mass of 44 grams/mole? a. C 2 H 6 b. C 3 H 8 c. C 4 H 10 d. C 5 H How many hydrogen atoms would a hydrocarbon/alkane with 14 carbon atoms have? a. 30 b. 60 c. 62 d Formulas for 3 isomers of pentane are shown below. Which answer choice correctly arranges the isomers from the highest boiling point to the lowest boiling point? a. A B C b. B C A c. C A B d. B A C e. C B A A. B. C.

9 ChemCom Unit III A Test: Name Worksheet: (show all work!) Period Write the name or molecular formula for each of the following alkanes. Formula Name 37. Pentane 38. Ethane CH C 10 H Write the molecular formula for an alkane/hydrocarbon containing 22 carbons? 42. Draw the electron dot formula for a single atom of oxygen: 43. Draw a structural formula of a straight-chain hexane, C 7 H 16 molecule. 44. Draw a structural formula of an isomer of the alkane C 7 H 16 you drew in question Draw an electron dot formula for the alkane; C 4 H 10.