1. Active Lecture Questions Copyright © 2011 Pearson Education Inc. Chapter 2 Atoms, Molecules, and Life

2. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e Which is the smallest unit of organization? 1.Cell 2.Atom 3.Organelle 4.Organ

3. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e Which is the smallest unit of organization? 1.Cell 2.Atom 3.Organelle 4.Organ

4. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e If an atom has 15 protons and 15 neutrons in its nucleus, how many electrons does it have? 1.2 2.4 3.8 4.15

5. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e If an atom has 15 protons and 15 neutrons in its nucleus, how many electrons does it have? 1.2 2.4 3.8 4.15

6. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e An inert element: 1.Forms covalent bonds with itself. 2.Has a full outer electron shell. 3.Has an empty outer electron shell. 4.Does not react with other elements because it is unstable.

7. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e An inert element: 1.Forms covalent bonds with itself. 2.Has a full outer electron shell. 3.Has an empty outer electron shell. 4.Does not react with other elements because it is unstable.

8. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e A chemical bond is formed through: 1.The gaining, losing, or sharing of protons. 2.The gaining, losing, or sharing of neutrons. 3.The gaining, losing, or sharing of electrons. 4.The gaining, losing, or sharing of ions.

9. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e A chemical bond is formed through: 1.The gaining, losing, or sharing of protons. 2.The gaining, losing, or sharing of neutrons. 3.The gaining, losing, or sharing of electrons. 4.The gaining, losing, or sharing of ions.

10. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e How many electrons does sodium have in its outer shell? 1.1 2.2 3.4 4.8

11. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e How many electrons does sodium have in its outer shell? 1.1 2.2 3.4 4.8

12. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e After sodium loses an electron, it is: 1.A positive ion. 2.A negative ion. 3.A neutral ion. 4.An isotope.

13. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e After sodium loses an electron, it is: 1.A positive ion. 2.A negative ion. 3.A neutral ion. 4.An isotope.

14. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e How many electrons does chlorine have in its outer shell? 1.1 2.2 3.4 4.7

15. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e How many electrons does chlorine have in its outer shell? 1.1 2.2 3.4 4.7

16. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e After chlorine gains an electron, it is: 1.A positive ion. 2.A negative ion. 3.A neutral ion. 4.An isotope.

17. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e After chlorine gains an electron, it is: 1.A positive ion. 2.A negative ion. 3.A neutral ion. 4.An isotope.

18. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e How many electrons does sodium lose to chlorine to form an ionic bond? 1.1 2.2 3.4 4.8

19. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e How many electrons does sodium lose to chlorine to form an ionic bond? 1.1 2.2 3.4 4.8

20. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e What is the difference between a nonpolar covalent bond and a polar covalent bond? 1.A polar covalent bond results when there is unequal sharing of electrons in a molecule, whereas electrons are shared equally in a nonpolar covalent bond. 2.A nonpolar covalent bond is positively charged and a polar covalent bond is negatively charged. 3.A polar covalent bond is positively charged and a nonpolar covalent bond is negatively charged. 4.A polar covalent bond results when an atom has more electrons than protons; a nonpolar covalent bond occurs when atoms have the same number of electrons and protons.

21. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e What is the difference between a nonpolar covalent bond and a polar covalent bond? 1.A polar covalent bond results when there is unequal sharing of electrons in a molecule, whereas electrons are shared equally in a nonpolar covalent bond. 2.A nonpolar covalent bond is positively charged and a polar covalent bond is negatively charged. 3.A polar covalent bond is positively charged and a nonpolar covalent bond is negatively charged. 4.A polar covalent bond results when an atom has more electrons than protons; a nonpolar covalent bond occurs when atoms have the same number of electrons and protons.

22. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e How many electrons does oxygen have in its outer shell? 1.1 2.2 3.4 4.6

23. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e How many electrons does oxygen have in its outer shell? 1.1 2.2 3.4 4.6

24. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e How many nonpolar covalent bonds does oxygen form with itself? 1.1 2.2 3.4 4.8

25. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e How many nonpolar covalent bonds does oxygen form with itself? 1.1 2.2 3.4 4.8

26. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e What kind of bonds hold the atoms of a single water molecule together? 1.Ionic 2.Polar covalent 3.Nonpolar covalent 4.Hydrogen

27. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e What kind of bonds hold the atoms of a single water molecule together? 1.Ionic 2.Polar covalent 3.Nonpolar covalent 4.Hydrogen

28. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e What kind of bonds form between water molecules? 1.Ionic 2.Polar covalent 3.Nonpolar covalent 4.Hydrogen

29. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e What kind of bonds form between water molecules? 1.Ionic 2.Polar covalent 3.Nonpolar covalent 4.Hydrogen

30. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e When you sweat, what property of water is functioning to cool you off? 1.Water is adhesive. 2.Water has a high heat of vaporization. 3.Water has a high surface tension. 4.Water is neutral in pH.

31. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e When you sweat, what property of water is functioning to cool you off? 1.Water is adhesive. 2.Water has a high heat of vaporization. 3.Water has a high surface tension. 4.Water is neutral in pH.

32. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e The basilisk lizard takes advantage of this property of water as it runs along the surface of a pond or stream: 1.Water is adhesive. 2.Water has a high heat of vaporization. 3.Water has a high surface tension. 4.Water is neutral in pH.

33. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e The basilisk lizard takes advantage of this property of water as it runs along the surface of a pond or stream: 1.Water is adhesive. 2.Water has a high heat of vaporization. 3.Water has a high surface tension. 4.Water is neutral in pH.

34. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e Pure water is neutral in pH because: 1.The concentration of oxygen and hydrogen are equal. 2.Hydrogen bonding reduces the formation of hydrogen ions. 3.Ionization does not occur. 4.The concentration of hydroxide ions and hydrogen ions are equal.

35. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e Pure water is neutral in pH because: 1.The concentration of oxygen and hydrogen are equal. 2.Hydrogen bonding reduces the formation of hydrogen ions. 3.Ionization does not occur. 4.The concentration of hydroxide ions and hydrogen ions are equal.

36. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e Without buffers such as bicarbonate or phosphate, which property would be directly affected? 1.Living things respond to stimuli. 2.Living things maintain homeostasis. 3.Living things need energy. 4.Living things grow.

37. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e Without buffers such as bicarbonate or phosphate, which property would be directly affected? 1.Living things respond to stimuli. 2.Living things maintain homeostasis. 3.Living things need energy. 4.Living things grow.

38. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e How many covalent bonds can be made by the carbon atom in the figure below? 1.1 2.2 3.4 4.8 Figure 2-2, part 1

39. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e How many covalent bonds can be made by the carbon atom in the figure below? 1.1 2.2 3.4 4.8 Figure 2-2, part 1