3. Combustion is a chemical process in which a fuel combines with to release energy and form products. A. oxygen B. nitrogen C. methane D.

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1 Exam 2 CHEM 1100 Version #1 Student: 1. The heat energy released or absorbed by a chemical reaction is generally determined by the difference between the energy that A. must be put in to break the bonds in the reactants and the energy that must be put in to make the bonds in the products. B. is released upon breaking the bonds in the reactants and the energy that is released upon making the bonds in the products. C. is released upon breaking the bonds in the reactants and the energy that must be put in to make the bonds in the products. D. must be put in to break the bonds in the reactants and the energy that is released upon making the bonds in the products. 2. A polar covalent bond is created when A. two atoms share their bonding electrons unequally. B. two atoms share three or more electrons. C. a metallic element reacts with a nonmetallic element. D. two atoms of the same element form double or triple bonds. 3. Combustion is a chemical process in which a fuel combines with to release energy and form products. A. oxygen B. nitrogen C. methane D. hydrogen 4. The energy that flows from a warmer body to a colder body is called A. heat. B. work. C. temperature. D. potential.

2 5. Which corresponds to the composition of the ion typically formed by fluorine? A. C B. A C. D D. B 6. The numbers 1 through 4 are used to identify four different elements on the periodic table. Which element is expected to have 2+ charge when it forms an ion? A. 3 B. 1 C. 2 D What is an aquifer? A. a large pool of water trapped in sand and gravel below the surface of the earth B. a solution in which the solvent is water C. a water purification system developed by the Romans D. a holding tank for disinfected water at the municipal water works 8. Which is a fossil fuel? A. ethanol B. uranium C. wood D. natural gas 9. The energy needed to initiate a chemical reaction is called the A. renewable energy. B. activation energy. C. heat of combustion. D. bond energy.

3 10. Based on this reaction and its energy profile, CH 4 (g) + 2O 2 (g) CO 2 (g) + 2H 2 O(g) the reaction A. is exothermic. B. is endothermic. C. violates the first law of thermodynamics. D. has a high activation energy. 11. Which covalent bond is the most polar? A. H N B. H S C. H H D. H O 12. The energy stored in the chemical bonds of fossil fuels is a form of energy. A. electrical B. kinetic C. mechanical D. potential

4 13. According to the graph below, the major source of energy in the United States during the years 1900 to 1950 was A. coal. B. wood. C. natural gas. D. petroleum. 14. Which is produced in the greatest amount from a barrel of petroleum? A. home heating oil B. gasoline C. asphalt and road oil D. lubricants and waxes 15. The attractions between anions and cations throughout a crystal are known collectively as A. hydrogen bonds. B. covalent bonds. C. ionic bonds. D. polar covalent bonds. 16. In a typical power plant, the combustion of a fuel is used to boil water. The steam then causes a turbine to spin. At this stage, the potential energy of the fuel has been transformed into energy of the spinning turbine. A. mechanical B. potential C. electrical D. kinetic

5 17. Which shows the Lewis structure of water with the correct partial charges and nonbonding electrons? A. B. C. D. 18. Though costs vary widely, bottled water is approximately times more expensive than tap water. A. 10 to 20 B. 100 to 1,000 C. 50 to 100 D. 250 to 10, If the lead concentration in water is 1 ppm, then we should be able to recover 1 mg of lead from L of water. A. 1 B C. 10 D In the petroleum industry, what does a refinery do? A. It separates crude oil from the coal with which it is almost always found. B. It produces the machinery by which crude oil is removed from the ground. C. It separates crude oil into fractions consisting of compounds with similar boiling points. D. It mixes natural gas or coal with crude oil in order to remove the impurities from the crude oil. 21. In an exothermic chemical reaction A. heat is released as the reaction proceeds. B. heat is absorbed as the reaction proceeds. C. the mass of the products is less than the mass of the reactants. D. the mass of the products is greater than the mass of the reactants.

6 22. The drawing shows two water molecules. Which statement is correct? A. A: covalent bond; B: hydrogen bond; B is stronger B. A: hydrogen bond; B: covalent bond; B is stronger C. A: covalent bond; B: hydrogen bond; A is stronger D. A: hydrogen bond; B: covalent bond; A is stronger 23. The property of matter that determines the direction of heat flow is the A. volume. B. mass. C. temperature. D. density. 24. The main reason that water supplies are "chlorinated" is A. to kill disease-causing organisms in the water. B. to produce gels that remove solids from the water. C. to soften the water. D. to precipitate lead salts from the water as insoluble lead chloride. 25. What is the correct name for (NH 4 ) 2 CO 3? A. ammonium carboxide B. biammonium carbonate C. ammonium carbonate D. ammonium bicarbonate

7 Exam 2 CHEM 1100 Key Version #1

8 1. The heat energy released or absorbed by a chemical reaction is generally determined by the difference between the energy that A. must be put in to break the bonds in the reactants and the energy that must be put in to make the bonds in the products. B. is released upon breaking the bonds in the reactants and the energy that is released upon making the bonds in the products. C. is released upon breaking the bonds in the reactants and the energy that must be put in to make the bonds in the products. D. must be put in to break the bonds in the reactants and the energy that is released upon making the bonds in the products. 2. A polar covalent bond is created when A. two atoms share their bonding electrons unequally. B. two atoms share three or more electrons. C. a metallic element reacts with a nonmetallic element. D. two atoms of the same element form double or triple bonds. 3. Combustion is a chemical process in which a fuel combines with to release energy and form products. A. oxygen B. nitrogen C. methane D. hydrogen 4. The energy that flows from a warmer body to a colder body is called A. heat. B. work. C. temperature. D. potential. 5. Which corresponds to the composition of the ion typically formed by fluorine? A. C B. A C. D D. B

9 6. The numbers 1 through 4 are used to identify four different elements on the periodic table. Which element is expected to have 2+ charge when it forms an ion? A. 3 B. 1 C. 2 D What is an aquifer? A. a large pool of water trapped in sand and gravel below the surface of the earth B. a solution in which the solvent is water C. a water purification system developed by the Romans D. a holding tank for disinfected water at the municipal water works 8. Which is a fossil fuel? A. ethanol B. uranium C. wood D. natural gas 9. The energy needed to initiate a chemical reaction is called the A. renewable energy. B. activation energy. C. heat of combustion. D. bond energy.

10 10. Based on this reaction and its energy profile, CH 4 (g) + 2O 2 (g) CO 2 (g) + 2H 2 O(g) the reaction A. is exothermic. B. is endothermic. C. violates the first law of thermodynamics. D. has a high activation energy. 11. Which covalent bond is the most polar? A. H N B. H S C. H H D. H O 12. The energy stored in the chemical bonds of fossil fuels is a form of energy. A. electrical B. kinetic C. mechanical D. potential

11 13. According to the graph below, the major source of energy in the United States during the years 1900 to 1950 was A. coal. B. wood. C. natural gas. D. petroleum. 14. Which is produced in the greatest amount from a barrel of petroleum? A. home heating oil B. gasoline C. asphalt and road oil D. lubricants and waxes 15. The attractions between anions and cations throughout a crystal are known collectively as A. hydrogen bonds. B. covalent bonds. C. ionic bonds. D. polar covalent bonds. 16. In a typical power plant, the combustion of a fuel is used to boil water. The steam then causes a turbine to spin. At this stage, the potential energy of the fuel has been transformed into energy of the spinning turbine. A. mechanical B. potential C. electrical D. kinetic

12 17. Which shows the Lewis structure of water with the correct partial charges and nonbonding electrons? A. B. C. D. American Chapter... # Though costs vary widely, bottled water is approximately times more expensive than tap water. A. 10 to 20 B. 100 to 1,000 C. 50 to 100 D. 250 to 10, If the lead concentration in water is 1 ppm, then we should be able to recover 1 mg of lead from L of water. A. 1 B C. 10 D In the petroleum industry, what does a refinery do? A. It separates crude oil from the coal with which it is almost always found. B. It produces the machinery by which crude oil is removed from the ground. C. It separates crude oil into fractions consisting of compounds with similar boiling points. D. It mixes natural gas or coal with crude oil in order to remove the impurities from the crude oil.

13 21. In an exothermic chemical reaction A. heat is released as the reaction proceeds. B. heat is absorbed as the reaction proceeds. C. the mass of the products is less than the mass of the reactants. D. the mass of the products is greater than the mass of the reactants. 22. The drawing shows two water molecules. Which statement is correct? A. A: covalent bond; B: hydrogen bond; B is stronger B. A: hydrogen bond; B: covalent bond; B is stronger C. A: covalent bond; B: hydrogen bond; A is stronger D. A: hydrogen bond; B: covalent bond; A is stronger 23. The property of matter that determines the direction of heat flow is the A. volume. B. mass. C. temperature. D. density. 24. The main reason that water supplies are "chlorinated" is A. to kill disease-causing organisms in the water. B. to produce gels that remove solids from the water. C. to soften the water. D. to precipitate lead salts from the water as insoluble lead chloride. 25. What is the correct name for (NH 4 ) 2 CO 3? A. ammonium carboxide B. biammonium carbonate C. ammonium carbonate D. ammonium bicarbonate

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