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1 | |
What are the key ideas to keep in mind as you organize information about organic chemistry? |
| | A) | Organic molecules can be manipulated in systematic, repeatable and predictable ways. |
| | B) | Structure dictates function. |
| | C) | Organic compounds always form ionic bonds. |
| | D) | All of the above. |
| | E) | a and b only |
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2 | |
Methane is |
| | A) | an organic compound. |
| | B) | the main component in natural gas. |
| | C) | CH4. |
| | D) | all of the above. |
| | E) | a and b only. |
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3 | |
When a carbon atom is connected to 4 other atoms, the resulting shape is based on a |
| | A) | triangle. |
| | B) | tetrahedron. |
| | C) | circle. |
| | D) | straight line. |
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4 | |
In a double bond there are __ electrons shared between two atoms. |
| | A) | 2 |
| | B) | 4 |
| | C) | 6 |
| | D) | 8 |
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5 | |
The bond angles resulting from atoms bonded in a tetrahedral shape are |
| | A) | 120o. |
| | B) | 90o. |
| | C) | 109.5o. |
| | D) | 65o. |
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6 | |
Carbon can form |
| | A) | double bonds. |
| | B) | single bonds. |
| | C) | triple bonds. |
| | D) | all of the above. |
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7 | |
Which of the following is not true of water? |
| | A) | It is a polar molecule. |
| | B) | It contains one atom of oxygen and two atoms of hydrogen. |
| | C) | It has a bent shape. |
| | D) | Is two poles of charge cancel each other out. |
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8 | |
Intermolecular forces are forces |
| | A) | within molecules. |
| | B) | between molecules. |
| | C) | pushing molecules apart. |
| | D) | of attraction between the protons and electrons. |
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9 | |
The phrase "like dissolves like" describes |
| | A) | the interaction of a polar and a nonpolar substance. |
| | B) | why water is hydrogen bonded. |
| | C) | why water and ethanol mix. |
| | D) | solubility of ionic compounds in nonpolar solvents. |
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10 | |
The shape of a water molecule is |
| | A) | trigonal. |
| | B) | bent. |
| | C) | linear. |
| | D) | tetrahedral. |
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11 | |
Acetylene, C2H2, is an example of an organic compound containing a __ bond between the two carbon atoms. |
| | A) | single |
| | B) | double |
| | C) | triple |
| | D) | ionic |
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12 | |
Anabolism is |
| | A) | a measure of disorder. |
| | B) | a reaction giving off energy. |
| | C) | when one substance limits the extent of a reaction. |
| | D) | the chemical process in the body that builds new tissue. |
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13 | |
Which of the following is a polar molecule? |
| | A) | CCl4 |
| | B) | CO2 |
| | C) | CH4 |
| | D) | CH3Cl |
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14 | |
There are __ carbon-carbon double bonds in the straight chain form of C6H8. |
| | A) | 1 |
| | B) | 2 |
| | C) | 3 |
| | D) | 4 |
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15 | |
The oxidation number of carbon in C2H6 is |
| | A) | +4. |
| | B) | -4. |
| | C) | +3. |
| | D) | -3. |
| | E) | +2 |
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16 | |
The percent by weight of carbon in C2H6 is |
| | A) | 75%. |
| | B) | 80%. |
| | C) | 85%. |
| | D) | 95%. |
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17 | |
Identify the set which contains isoelectronic species. |
| | A) | O, S, Se, Te |
| | B) | C, N, O, F |
| | C) | F-, Ne, Na+, Mg2+ |
| | D) | Mg2+, Ba2+, Ca2+, Sr2+ |
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18 | |
The best arrangement of a given number of electrons in the valence-shell electron-pair repulsion (VSEPR) model is |
| | A) | the one that minimizes the repulsions among them. |
| | B) | the one that maximizes the repulsions among them. |
| | C) | the one that makes the molecule linear. |
| | D) | the one that makes the molecule trigonal planar. |
| | E) | There is not a "best" arrangement for electrons in a molecule. |
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19 | |
What is the predicted bond angle for a molecule with a trigonal planar electron-pair geometry? |
| | A) | 180o |
| | B) | 120o |
| | C) | 109.5o |
| | D) | 45o |
| | E) | 90o |
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20 | |
When is a dipole established? |
| | A) | When two electrical charges of equal magnitude but opposite sign are separated by a distance. |
| | B) | When two electrical charges of unequal magnitude but opposite sign are separated by a distance. |
| | C) | When two charges of equal magnitude and same sign are separated by a distance. |
| | D) | When two charges of equal magnitude and opposite sign are not separated by a distance. |
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