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Which of these is a population? (Activity 2A)
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|  |
|  |
|  |
|  |
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Which of these choices includes the others? (Activity 2A)
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| atom |
| organism |
| population |
| tissue |
| molecule |
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Which of these is the most inclusive level of organization? (Activity 2A)
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| community |
| organism |
| ecosystem |
| organ |
| population |
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All the species of bacteria inhabiting your gut make up a(n) _____. (Activity 2A)
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| ecosystem |
| population |
| organism |
| organ system |
| community |
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The basic unit of life is the _____. (Activity 2A)
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| cell |
| atom |
| organism |
| population |
| molecule |
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What is the atomic number of an atom that has 6 protons, 6 neutrons, and 6 electrons? (Activity 2B)
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| 18 |
| 12 |
| 0 |
| 6 |
| -1 |
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Which of these refers to atoms with the same atomic number but different atomic masses? (Activity 2B)
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| These atoms are different elements. |
| These atoms have different numbers of electrons. |
| These atoms are isomers. |
| These atoms are isotopes. |
| These atoms have different numbers of protons. |
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Fluorine's atomic number is 9 and its atomic mass is 19. How many neutrons does fluorine have? (Activity 2B)
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| 81 |
| 9 |
| 19 |
| 28 |
| 10 |
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An uncharged atom of boron has an atomic number of 5 and an atomic mass of 11. How many protons does boron have? (Activity 2B)
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| 0 |
| 5 |
| 6 |
| 11 |
| 16 |
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The innermost electron shell of an atom can hold up to _____ electrons. (Activity 2C)
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| 2 |
| 18 |
| 32 |
| 8 |
| 1 |
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Which of these relationships is true of an uncharged atom? (Activity 2C)
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| The atomic mass is equal to the number of electrons. |
| The number of protons is equal to the number of electrons. |
| The number of neutrons is equal to the number of protons. |
| The atomic mass is equal to the atomic number. |
| The number of electrons is equal to the number of neutrons. |
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What determines the types of chemical reactions that an atom participates in? (Activity 2C)
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| its atomic mass |
| the number of electrons in the innermost electron shell |
| the number of electrons in the outermost electron shell |
| the number of protons it contains |
| its atomic number |
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What type of bond is joining the two hydrogen atoms? (Activity 2E) 
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| covalent |
| hydrogen |
| ionic |
| hydrophobic |
| hydrophilic |
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A(n) _____ refers to two or more atoms held together by covalent bonds. (Activity 2E)
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| ion |
| isotope |
| community |
| shell |
| molecule |
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This atom can form up to _____ single covalent bond(s). (Activity 2E) 
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| 0 |
| 1 |
| 2 |
| 3 |
| 4 |
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A(n) _____ bond joins these two oxygen atoms. (Activity 2E) 
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| single covalent |
| ionic |
| quadruple covalent |
| hydrogen |
| double covalent |
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Which of these figures correctly illustrates the nature of the bonding of H2O? (Activity 2F)
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|  |
|  |
|  |
|  |
|  |
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What type of bond joins the carbon atom to each of the hydrogen atoms? (Activity 2F) 
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| hydrogen |
| single (nonpolar) covalent |
| ionic |
| polar covalent |
| double (nonpolar) covalent |
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Atoms with the same number of protons but with different electrical charges _____. (Activity 2G)
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| have different atomic masses |
| have different numbers of neutrons |
| are different ions |
| have different atomic numbers |
| are different isotopes |
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In salt, what is the nature of the bond between sodium and chlorine? (Activity 2G)
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| polar covalent |
| nonpolar covalent |
| hydrogen |
| hydrophobic |
| ionic |
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Click on the diagram to start the animation. What is the result of the animated process? (Activity 2G)
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| a positively charged sodium ion and a negatively charged chlorine ion |
| a positively charged sodium ion and a positively charged chlorine ion |
| covalent bond formation |
| a negatively charged sodium ion and a positively charged chlorine ion |
| a negatively charged sodium ion and a negatively charged chlorine ion |
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An ionic bond involves _____. (Activity 2G)
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| the sharing of a single pair of electrons |
| an attraction between ions of opposite charge |
| no atoms other than sodium and chlorine |
| the unequal sharing of an electron pair |
| water avoidance |
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The brackets are indicating a(n) _____ bond. (Activity 2H) 
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| ionic |
| polar covalent |
| single (nonpolar) covalent |
| hydrophobic |
| hydrogen |
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What name is given to the bond between water molecules? (Activity 2H)
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| hydrogen |
| hydrophobic |
| ionic |
| polar covalent |
| single (nonpolar) covalent |
