Write the letter of the best answer.
1. Element X belongs to Group 1. Which of the following best describes element X?
a. high electronegativity b. high ionization energy c. low electronegativity d. a non-metallic element
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35 2. What will most likely happen to a non-metallic atom after ionic bonding?
I. It forms a cation II. It forms an anion III. It becomes stable IV. It becomes unstable
a. I & II b. II & III c. III & IV d. I & IV
3. What kind of bond will result when two identical non-metallic atoms combine? a. ionic bond c. polar covalent bond
b. metallic bond d. nonpolar covalent bond
4. Choose 2 elements that would likely form an ionic bond among the following elements: Li, Si, F, Ne
a. Li and Si b. Si and F c. Ne and Si d. Li and F 5. How is the bond in Br2 different from the bond in MgF2?
a. The bond in Br2 is metallic while the bond in MgF2 is covalent.
b. The bond in Br2 is ionic while the bond in MgF2 is covalent.
c. The bond in Br2 is covalent while the bond in MgF2 is ionic.
d. There is no bond difference between the two.
6. Why do atoms react with one another to form chemical bonds? a. to attain stability b. to form compounds c. to form molecules d. to produce ions 7. What kind of force is present in ionic bond?
a. repulsive force b. electrostatic force c. neutral force d. retentive force
8. Which of the following solute will make water a good conductor of electricity?
a. sugar b. oil
c. wax d. monosodium glutamate
9. What bond holds the atoms of the elements in Groups 1and 2 of the Periodic Table?
a. nonpolar covalent bond b. polar covalent bond
c. metallic bond d. ionic bond
10. Which of the following sets of samples has metallic bond, covalent bond and ionic bonding in this order?
a. bronze, paraffin wax and salt b. alloy, vetsin and water
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References:
LeMay, E.H. Jr., Robblee, K.M., Brower, H., Douglas C. (1996). Chemistry Connections to Our Changing World. New Jersey: Prentice Hall, Inc.
Magno, M., et. al. (2001).Practical Work in High School Chemistry, Sourcebook for Teachers. Quezon City: UP National Institute for Science & Mathematics Education Development.
Silberberg, M. (1996).Chemistry: The Molecular Nature of Matter and Change. St. Louis: Mosby
Wilbraham, A.C., Staley, D. D., Matta, M. (1997).Chemistry, 4thed. New York: Addison-
Wesley Pub.
Wilbraham, A.C., Staley, D.D., Matta, M.S. & Waterman, E.L. (2007). Chemistry, Teacher’s Ed. Boston, Massachusetts:Pearson, Prentice Hall, Inc.
Internet Links: chemed.chem.purdue.edu http://curriculum.nismed.upd.edu.ph http://www.smallscalechemistry.colostate.edu/PowerfulPictures/ChemicalBonding.pdf http://www.chemguide.co.uk/atoms/bonding/electroneg.html http://chemistry.about.com/od/electronicstructure/a/Octet-Rule.htm http://www.edu-resource.com/chemistry/what-are-ionic-compounds.php http://misterguch.brinkster.net/ionic.html
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The Carbon Compounds____
Overview
In the previous module, you have learned about how non-metals make chemical bonds by sharing electrons from their outer shells to attain stable electronic configurations. This is also the process by which every carbon compounds or organic compound is formed. In this module, the lessons will be about the uses and properties of common organic compounds like hydrocarbons, aldehydes and ketones, carboxylic acids and alcohols.
In this module, you will be able to answer the following key questions:
In your quest to answer the above thought provoking questions you will be able to: explain how the structure of carbon atom affects the types of bonds it forms recognize the general classes and uses of organic compounds.
Before anything else, please answer the pre-assessment prepared for you.
Module
3
Suggested Time allotment: 4 hours
What are organic compounds?
What are the important uses of organic compounds? How are the carbon atoms able to form many organic compounds?
In what ways are the properties of organic compounds related to their uses?
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Pre-Assessment:
Write the letter of the correct answer.
1. Which of the following statements best describe organic compounds?
A. Organic compounds are compounds that contain carbon and oxygen only B. Organic compounds are compounds that are produced by living things C. Organic compounds are composed mainly of carbon and hydrogen D. Organic compounds are compounds that contain carbon atoms only
2. How do carbon atoms form many organic compounds?
A. By attracting other elements toward themselves to form the bonds B. By forming many bonds with other carbon atoms and other elements C. By sharing their electrons with other metal and non-metal elements D. By transferring their electrons to the atoms of surrounding elements
3. What is the maximum number of bonds can a carbon atom form?
A. 2 C. 4
B. 3 D. 5
4. Mang Tibo, a fisher man, went home with some of his catch and told his son to cook the fish. But his son said, “father the stove ran out of fuel already”. Then his father told him to buy some so that they could start cooking the fish. Which organic compound do you think the boy will buy?
A. kerosene C. lubricating oil B. gasoline D. isopropyl alcohol
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39 5. Which of the following pairs of organic compounds is highly flammable?
A. gasoline, acetone C. lubricating oil, isopropyl alcohol B. water, ethyl alcohol D. liquefied petroleum gas, kerosene
6. Christian is applying something to the ball bearings of the wheels of his bicycle so that friction will be minimized. Which of the following material do you think he is using?
A. vinegar C. kerosene
B. isopropyl alcohol D. lubricating oil
7. A gasoline boy was being scolded by his store manager for smoking in the vicinity of the gasoline station. Why do you think the manager scolded his employee?
A. because gasoline is volatile C. because gasoline is viscous B. because gasoline is flammable D. all of the above
8. Nimfa scratched herself when her arm bumped in the concrete post. What do you think should she apply to make her bruises free from harmful germs?
A. formalin C. water
B. isopropyl alcohol D. acetone 9. Which organic compound is used as a cleaning agent?
A. gasoline C. liquefied petroleum gas (LPG)
B. kerosene D. ethyl alcohol
10. Which hydrocarbon compound has a triple bond in the molecule?
A. octane C. ethene
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40 11. How many types of bonds are there in the following hydrocarbon compound?
A. 1 C. 3
B. 2 D. 4
12. To which group of hydrocarbon does the molecule with the structure
belong?
A. alkane C. alkene
B. alkyne D. none of the above
13. Ethene is a natural gas produced in plants, which acts as a natural ripening agent of fruits. Which of the following organic compounds has the same ability to ripen fruits?
A. butane C. acetylene
B. propene D. pentyne
14. Which alkane will most likely have a very low boiling point?
A. propane C. butane
B. pentane d. hexane
15. What is the common use of methane?
A. disinfectant C. artificial ripening agent
B. fertilizer D. fuel
16. Which are TRUE about the use of isopropyl alcohol? I. cleaner III. disinfectant II. fuel IV. fertilizer
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41 A. I and II only C. III and IV only
B. II and III only D. I and IV only
17. Abong has to remove the red paint in the paintbrush so that he could still use it again next time. What organic compound should he use to remove the paint in the paintbrush?
A. acetic acid C. kerosene B. lubricating oil D. formaldehyde 18. Which of the following compounds is a carbonyl compound?
A. C.
B. D. all of the above
19. What organic compound is used by embalmers in treating human cadavers? A. acetic acid C. methyl alcohol
B. formaldehyde D. acetone
20. Which compound is an alcohol?
A. C.
B. D.
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42