1. Chapter Resources CHAPTER HOME BACK TO CHAPTER Content Review Review key concepts and vocabulary Math Tutorial Review math concepts Resource Center Get more information on select science topics Standardized Test Practice Practice state standardized tests Animations Link to all the McDougal Littell Science animations Review Game Play a fun interactive review game Audio Readings Hear chapter audio readings Image Gallery Click here to review chapter images and animations Click on the items below to access resources on CLASSZONE.COM

2. CHAPTER HOME Image Gallery Click on the icons to see a larger image or animation. SIMULATION Build a model of an atom. CLASSZONE.COM VISUALIZATION Watch how a radioactive element decays over time. CLASSZONE.COM

3. The periodic table is a map of the elements. SECTION OUTLINE SECTION OUTLINE metal reactive The periodic table has distinct regions. 7.3 CHAPTER RESOURCES CHAPTER RESOURCES nonmetal metalloid radioactivity half-life Three regions are metals, metalloids, and nonmetals. VISUALIZATION Watch how a radioactive element decays over time. CLASSZONE.COM

4. Elements make up the periodic table. SECTION OUTLINE SECTION OUTLINE periodic table atomic mass Elements in a period have varying properties. Elements can be organized by similarities. Groups of elements have similar properties. 7.2 CHAPTER RESOURCES CHAPTER RESOURCES group period

5. SECTION OUTLINE SECTION OUTLINE neutron proton Atoms are the smallest form of elements. electron nucleus atomic number 7.1 CHAPTER RESOURCES CHAPTER RESOURCES atomic mass number isotope ion All matter is made of the atoms of approximately 100 elements. Atoms of elements contain protons, neutrons, and electrons. nucleus electron cloud neutron proton SIMULATION Build a model of an atom. CLASSZONE.COM

6. Chapter Resources CHAPTER HOME BACK TO CHAPTER Content Review Review key concepts and vocabulary Math Tutorial Review math concepts Resource Center Get more information on select science topics Standardized Test Practice Practice state standardized tests Animations Link to all the McDougal Littell Science animations Review Game Play a fun interactive review game Audio Readings Hear chapter audio readings Image Gallery Click here to review chapter images and animations Click on the items below to access resources on CLASSZONE.COM

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8. SECTION OUTLINE SECTION OUTLINE Chemical reactions involve energy changes. exothermic reaction bond energy endothermic reaction In an endothermic reaction, more energy is added than released. Different bonds contain different amounts of energy. In an exothermic reaction, more energy is released than added. photosynthesis 9.3 VISUALIZATION View examples of endothermic and exothermic reactions. CHAPTER RESOURCES CHAPTER RESOURCES

9. Chapter Resources CHAPTER HOME BACK TO CHAPTER Content Review Review key concepts and vocabulary Math Tutorial Review math concepts Resource Center Get more information on select science topics Standardized Test Practice Practice state standardized tests Animations Link to all the McDougal Littell Science animations Review Game Play a fun interactive review game Audio Readings Hear chapter audio readings Image Gallery Click here to review chapter images and animations Click on the items below to access resources on CLASSZONE.COM

10. Carbon-based molecules are life’s building blocks. carbohydrate SECTION OUTLINE SECTION OUTLINE lipid protein enzyme nucleic acid 11.3 CHAPTER RESOURCES CHAPTER RESOURCES There are four main types of carbon-based molecules in living things. Carbohydrates sugars and starches energy for cells plant cell walls Lipids fats and oils energy for cells cell membranes Proteins strings of amino acids used for structure, transport, immune system, enzymes Nucleic Acids DNA and RNA genetic code code for amino acids

11. Carbon-based molecules have many structures. SECTION OUTLINE SECTION OUTLINE 11.2 CHAPTER RESOURCES CHAPTER RESOURCES inorganic compound polymer organic compound isomer Carbon can form chains and rings. VISUALIZATION Observe and rotate three- dimensional models of carbon- based molecules. CLASSZONE.COM

12. Chapter Resources CHAPTER HOME BACK TO CHAPTER Content Review Review key concepts and vocabulary Math Tutorial Review math concepts Resource Center Get more information on select science topics Standardized Test Practice Practice state standardized tests Animations Link to all the McDougal Littell Science animations Review Game Play a fun interactive review game Audio Readings Hear chapter audio readings Image Gallery Click here to review chapter images and animations Click on the items below to access resources on CLASSZONE.COM

13. CHAPTER HOME Image Gallery Click on the icons to see a larger image or animation. VISUALIZATION Explore some physical and chemical changes.

14. Chemical bonds hold compounds together. SECTION OUTLINE SECTION OUTLINE Chemical bonds give all materials their structure. Chemical bonds between atoms involve electrons. Atoms can transfer electrons. Atoms can share electrons. ionic bond molecule polar covalent bond covalent bond 8.2 CHAPTER RESOURCES CHAPTER RESOURCES VISUALIZATON Examine how electrons move in a polar covalent molecule. VISUALIZATION Watch an animation showing ionic and covalent bonding. CLASSZONE.COM

15. Earth rotates on a tilted axis and orbits the Sun. SECTION OUTLINE SECTION OUTLINE revolution axis of rotation Earth’s rotation in sunlight causes day and night. The changing angles of sunlight on Earth cause seasons. season equinox solstice 12.2 VISUALIZATION Find out how sunlight affects the temperature in different places at different times of year. CLASSZONE.COM CHAPTER RESOURCES CHAPTER RESOURCES

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41. reference point motion position An object in motion changes position. SECTION OUTLINE SECTION OUTLINE Position is measured from a reference point. Motion is measured relative to an observer. 1.1 VISUALIZATION Learn how your motion makes a difference in what you observe. CHAPTER RESOURCES CHAPTER RESOURCES

42. Newton's first law Objects at rest remain at rest, and objects in motion remain in motion with the same velocity, unless acted upon by an unbalanced force. Forces change motion. SECTION OUTLINE SECTION OUTLINE net force force Newton's first law inertia 2.1 SIMULATION Change the sizes and directions of forces on an object and predict how it will move. CHAPTER RESOURCES CHAPTER RESOURCES

43. Newton's second law The acceleration of an object increases with increased force and decreases with increased mass, and is in the same direction as the force. centripetal force Force and mass determine acceleration. SECTION OUTLINE SECTION OUTLINE 2.2 SIMULATION Explore Newton’s second law. CHAPTER RESOURCES CHAPTER RESOURCES

44. CHAPTER HOME Image Gallery Click on the icons to see a larger image or animation. SIMULATION Change the sizes and directions of forces on an object and predict how it will move. SIMULATION Explore Newton’s second law.

45. Chapter Resources CHAPTER HOME BACK TO CHAPTER Content Review Review key concepts and vocabulary Math Tutorial Review math concepts Resource Center Get more information on select science topics Standardized Test Practice Practice state standardized tests Animations Link to all the McDougal Littell Science animations Review Game Play a fun interactive review game Audio Readings Hear chapter audio readings Image Gallery Click here to review chapter images and animations Click on the items below to access resources on CLASSZONE.COM

46. Speed is how fast positions change with time. velocity vector speed Speed measures how fast position changes. SECTION OUTLINE SECTION OUTLINE distance 00:00 00:02 Speed = distance time 1.2 CHAPTER RESOURCES CHAPTER RESOURCES

47. CHAPTER HOME Image Gallery BACK TO IMAGE GALLERY

48. Acceleration measures how fast velocity changes. acceleration SECTION OUTLINE SECTION OUTLINE 1.3 VISUALIZATION Explore how changing the acceleration of an object changes its motion. CHAPTER RESOURCES CHAPTER RESOURCES

49. Chapter Resources CHAPTER HOME BACK TO CHAPTER Content Review Review key concepts and vocabulary Math Tutorial Review math concepts Resource Center Get more information on select science topics Standardized Test Practice Practice state standardized tests Animations Link to all the McDougal Littell Science animations Review Game Play a fun interactive review game Audio Readings Hear chapter audio readings Image Gallery Click here to review chapter images and animations Click on the items below to access resources on CLASSZONE.COM

50. CHAPTER HOME Image Gallery Click on the icons to see a larger image or animation. VISUALIZATION Learn how your motion makes a difference in what you observe. VISUALIZATION Explore how changing the acceleration of an object changes its motion.

51. Chapter Resources CHAPTER HOME BACK TO CHAPTER Content Review Review key concepts and vocabulary Math Tutorial Review math concepts Resource Center Get more information on select science topics Standardized Test Practice Practice state standardized tests Animations Link to all the McDougal Littell Science animations Review Game Play a fun interactive review game Audio Readings Hear chapter audio readings Image Gallery Click here to review chapter images and animations Click on the items below to access resources on CLASSZONE.COM

52. 6.2 SECTION OUTLINE SECTION OUTLINE Temperature depends on particle movement. temperature kinetic theory of matter thermometer Temperature is commonly measured on the Fahrenheit or Celsius scales. All particles in matter have kinetic energy. Temperature is the measurement of the average kinetic energy of particles in an object. Particles in a warmer substance have a greater average kinetic energy than particles in a cooler substance. VISUALIZATION Explore how temperature affects the speed of particles. CHAPTER RESOURCES CHAPTER RESOURCES

53. Chapter Resources CHAPTER HOME BACK TO CHAPTER Content Review Review key concepts and vocabulary Math Tutorial Review math concepts Resource Center Get more information on select science topics Standardized Test Practice Practice state standardized tests Animations Link to all the McDougal Littell Science animations Review Game Play a fun interactive review game Audio Readings Hear chapter audio readings Image Gallery Click here to review chapter images and animations Click on the items below to access resources on CLASSZONE.COM