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<ul><li>A  physical property   is a characteristic that you can observe without changing or trying to change the compositi...
<ul><li>You can detect many  physical properties  with your senses.  </li></ul><ul><li>For example, you can see the color ...
<ul><li>To describe a sample of matter, you need to identify its  state .  This property, known as the  state of matter , ...
Click image to view movie.
<ul><li>Perhaps you are most familiar with the three states of water.  </li></ul>State <ul><li>You can drink or swim in  l...
State <ul><li>You use the  solid state  of water, which is ice, when you put ice cubes in a drink.   </li></ul><ul><li>Alt...
<ul><li>Some  physical properties  depend on the size of the object.  </li></ul>Size-Dependent Properties
<ul><li>Another  physical   property  that depends on size is  mass , which is a measurement of how much matter it contain...
Size-Dependent Properties <ul><li>If you were to travel to other planets, your  weight  would change but your  size  and  ...
<ul><li>Another physical property,  density , does not depend on the size of an object .  </li></ul>Size-Independent Prope...
<ul><li>Another property,  solubility , also does not depend on size.  </li></ul>Size-Independent Properties <ul><li>Solub...
<ul><li>The temperature at which a solid changed into a liquid is called its  melting point .  </li></ul>Melting and Boili...
<ul><li>Some materials pull iron toward them.  </li></ul>Magnetic Properties <ul><li>These materials are said to be magnet...
<ul><li>Some properties of matter cannot be identified just by looking at a sample.  </li></ul>Chemical Properties <ul><li...
Physical Changes <ul><li>A  physical change   is one in which the form or appearance of matter changes, but not its compos...
Changing Shape <ul><li>Crumpling a sheet of paper into a ball causes a  physical change .  </li></ul><ul><li>Whether it ex...
Dissolving <ul><li>When you add sugar to iced tea, the sugar only seems to disappear. </li></ul><ul><li>Actually, the suga...
Changing State <ul><li>A  physical change  occurs when matter changes from one state to another.  </li></ul><ul><li>When a...
Changing State <ul><li>A   liquid also can change into a gas. This process is known as  vaporization .  </li></ul><ul><li>...
Changing State <ul><li>In some cases, matter changes between the solid and gas states without ever becoming a liquid.  </l...
Chemical Changes <ul><li>The explosion of fireworks is an example of a  chemical change .  </li></ul><ul><li>During a  che...
Chemical Changes <ul><li>When iron in steel is exposed to oxygen and water in air, iron and oxygen atoms combine to form t...
Signs of Chemical Changes <ul><li>Physical changes  are relatively easy to identify.  </li></ul><ul><li>If only the form o...
Signs of Chemical Changes <ul><li>You have witnessed a spectacular  chemical change  if you have seen the leaves on a tree...
Signs of Chemical Changes <ul><li>The green  pigmen t that you see during the summer is  chlorophyll  (KLOHR uh fihl).  </...
Signs of Chemical Changes <ul><li>The  chlorophyll  already in the leaves undergoes a chemical change into colorless chemi...
Signs of Chemical Changes <ul><li>The  pigments  that produce fall colors have been present in the leaves all along.  </li...
Color <ul><li>The reason a half-eaten apple turns brown is that a  chemical change  occurs when the apple is exposed to ai...
Energy <ul><li>Another sign of a  chemical change  is the release or gain of  energy  by an object.  </li></ul><ul><li>Man...
Energy <ul><li>Another  chemical change  in which a substance absorbs  energy  occurs during the production of cement.  </...
Energy <ul><li>Energy  also can be released during a  chemical change .  </li></ul><ul><li>Fireworks release  energy  in t...
Odor <ul><li>When eggs and other foods spoil, they undergo  chemical change . </li></ul><ul><li>The change in odor is a cl...
Gases or Solids <ul><li>The formation of a  gas  is a clue to a  chemical change . </li></ul><ul><li>The formation of a  s...
Not Easily Reversed <ul><li>Physical  and  chemical changes  are different from one another. </li></ul><ul><li>After solid...
Not Easily Reversed <ul><li>The substances produced during a  chemical change  cannot be changed back into the original su...
Chemical Versus Physical Changes <ul><li>In a  physical change , the composition of a substance does not change.  </li></u...
Chemical Versus Physical Changes <ul><li>When substances like wood and copper undergo  physical changes , the original woo...
Chemical Versus Physical Changes <ul><li>Instead, different substances are produced during the  chemical change .  </li></...
Chemical Versus Physical Changes <ul><li>Physical  and  chemical changes  are used to recycle or reuse certain materials. ...
Conservation of Mass <ul><li>During a  chemical change , the form or the composition of the  matter  changes.  </li></ul><...
Conservation of Mass <ul><li>The number and type of particles remains the same.  </li></ul><ul><li>As a result, the total ...
Conservation of Mass <ul><li>In many  chemical changes  in which  mass  seems to be gained or lost, the difference is ofte...
Conservation of Mass <ul><li>The scientist who first performed the careful experiments necessary to prove that  mass  is c...
MATCHING <ul><li>State  </li></ul>J. Release of energy K. Mass  L. Liquid  I. Behavior  H. Physical property G. Physical c...
MATCHING <ul><li>State  </li></ul>J. Release of energy K. Mass  L. Liquid  I. Behavior  H. Physical property G. Physical c...
MATCHING <ul><li>State  </li></ul>J. Release of energy K. Mass  L. Liquid  I. Behavior  H. Physical property G. Physical c...
MATCHING <ul><li>State  </li></ul>J. Release of energy K. Mass  L. Liquid  I. Behavior  H. Physical property G. Physical c...
MATCHING <ul><li>State  </li></ul>J. Release of energy K. Mass  L. Liquid  I. Behavior  H. Physical property G. Physical c...
MATCHING <ul><li>State  </li></ul>J. Release of energy K. Mass  L. Liquid  I. Behavior  H. Physical property G. Physical c...
MULTIPLE CHOICE 13. ____Which of these is not a physical property of matter. A. Density  B. Mass  D. Texture  C. Ability t...
MULTIPLE CHOICE 15. ____an example of a change of state is A. Evaporating  B. Rusting  C. Burning  A D. Dissolving
MULTIPLE CHOICE 16. ____Which of the  following shows a behavioral property. A. Peeling a banana B. Iron attracted to a lo...
MULTIPLE CHOICE 17. ____is an example of a chemical change. A. Melting of chocolate.  B. Freezing of water D. Burning of p...
MULTIPLE CHOICE 19. ____Which of these  indicates that a chemical change has taken place A. Change from a liquid to a gas ...
MULTIPLE CHOICE 20. ____the density of a material is _____. A. How much the material weighs B. The mass of a unit volume D...
MULTIPLE CHOICE 21. ____The process of a liquid changing into a gas is called_______. A. Sublimation  B. Condensation  D. ...
23. ____The process of a solid changing directly into a gas, without ever becoming a liquid is called is called_______. A....
MULTIPLE CHOICE 25. ____an objects odor _____. A. Physical property B. Chemical property D. Chemical change C. Physical ch...
SHORT ANSWER List 3 ways you could change the physical properties of the piece of paper Crumpling the paper Tearing the pa...
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Density Common Chemical Changes Q And A

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Transcript of "Density Common Chemical Changes Q And A"

  1. 1. <ul><li>A physical property is a characteristic that you can observe without changing or trying to change the composition of the substance . </li></ul><ul><li>How something looks, smells, sounds, or tastes are all examples of physical properties . </li></ul>Physical Properties
  2. 2. <ul><li>You can detect many physical properties with your senses. </li></ul><ul><li>For example, you can see the color and shape of an object. </li></ul>Using Your Senses <ul><li>You can also touch it to feel its texture. </li></ul><ul><li>You can smell the odor or taste the flavor of some matter. </li></ul>
  3. 3. <ul><li>To describe a sample of matter, you need to identify its state . This property, known as the state of matter , is another physical property that you can observe. </li></ul>State
  4. 4. Click image to view movie.
  5. 5. <ul><li>Perhaps you are most familiar with the three states of water. </li></ul>State <ul><li>You can drink or swim in liquid water . </li></ul>
  6. 6. State <ul><li>You use the solid state of water, which is ice, when you put ice cubes in a drink. </li></ul><ul><li>Although you can’t see it, water in the gas state is all around you in the air. </li></ul>
  7. 7. <ul><li>Some physical properties depend on the size of the object. </li></ul>Size-Dependent Properties
  8. 8. <ul><li>Another physical property that depends on size is mass , which is a measurement of how much matter it contains. </li></ul>Size-Dependent Properties <ul><li>Weight is a measurement of force. </li></ul>
  9. 9. Size-Dependent Properties <ul><li>If you were to travel to other planets, your weight would change but your size and mass would not. </li></ul><ul><li>Weight depends on the mass of the object and on gravity . </li></ul>
  10. 10. <ul><li>Another physical property, density , does not depend on the size of an object . </li></ul>Size-Independent Properties <ul><li>Density measures the amount of mass in a given volume . </li></ul><ul><li>To calculate the density of an object, divide its mass by its volume . </li></ul>
  11. 11. <ul><li>Another property, solubility , also does not depend on size. </li></ul>Size-Independent Properties <ul><li>Solubility is the number of grams of one substance that will dissolve in 100 g of another substance at a given temperature. </li></ul>
  12. 12. <ul><li>The temperature at which a solid changed into a liquid is called its melting point . </li></ul>Melting and Boiling Point <ul><li>The temperature at which a liquid changes into a gas is called its boiling point . </li></ul>
  13. 13. <ul><li>Some materials pull iron toward them. </li></ul>Magnetic Properties <ul><li>These materials are said to be magnetic. </li></ul><ul><li>Lodestone is a rock that is naturally magnetic. </li></ul><ul><li>Some materials can be made into magnets. </li></ul>
  14. 14. <ul><li>Some properties of matter cannot be identified just by looking at a sample. </li></ul>Chemical Properties <ul><li>For example, the ability to burn is a chemical property . </li></ul><ul><li>A chemical property is a characteristic that cannot be observed without altering the substance. </li></ul>
  15. 15. Physical Changes <ul><li>A physical change is one in which the form or appearance of matter changes, but not its composition. For example, a frozen lake has experienced a physical change . </li></ul><ul><li>Although the water changes states due to change in temperature, it is still made of the elements hydrogen and oxygen. </li></ul>
  16. 16. Changing Shape <ul><li>Crumpling a sheet of paper into a ball causes a physical change . </li></ul><ul><li>Whether it exists as one flat sheet or a crumples ball, the matter is still paper. </li></ul><ul><li>Generally, whenever you cut, tear, grind, or bend matter, you are causing a physical change . </li></ul>
  17. 17. Dissolving <ul><li>When you add sugar to iced tea, the sugar only seems to disappear. </li></ul><ul><li>Actually, the sugar dissolves . </li></ul><ul><li>When this happens, the particles of sugar spread out in the liquid. </li></ul><ul><li>The composition of the sugar stays the same, which is why the iced tea tastes sweet . </li></ul><ul><li>Only the form of the sugar has changed. </li></ul>
  18. 18. Changing State <ul><li>A physical change occurs when matter changes from one state to another. </li></ul><ul><li>When an ice cube melts, for example, it becomes liquid water. </li></ul><ul><li>Matter can change from any state to another. </li></ul><ul><li>Freezing is the opposite of melting. </li></ul><ul><li>During freezing , a liquid changes into a solid. </li></ul>
  19. 19. Changing State <ul><li>A liquid also can change into a gas. This process is known as vaporization . </li></ul><ul><li>During the reverse process, called condensation , a gas changes into a liquid. </li></ul>
  20. 20. Changing State <ul><li>In some cases, matter changes between the solid and gas states without ever becoming a liquid. </li></ul><ul><li>The process in which a solid changes directly into a gas is called sublimation . </li></ul><ul><li>The opposite process, in which a gas changes into a solid, is called deposition . </li></ul>
  21. 21. Chemical Changes <ul><li>The explosion of fireworks is an example of a chemical change . </li></ul><ul><li>During a chemical change , substances are changed into different substances. </li></ul><ul><li>In other words, the composition of the substance changes. </li></ul>
  22. 22. Chemical Changes <ul><li>When iron in steel is exposed to oxygen and water in air, iron and oxygen atoms combine to form the principle component in rust. </li></ul><ul><li>In a similar way, silver coins tarnish when exposed to air. </li></ul>
  23. 23. Signs of Chemical Changes <ul><li>Physical changes are relatively easy to identify. </li></ul><ul><li>If only the form of a substance changes, you have observed a physical change . </li></ul><ul><li>How can you tell whether a change is a chemical change ? </li></ul>
  24. 24. Signs of Chemical Changes <ul><li>You have witnessed a spectacular chemical change if you have seen the leaves on a tree change from green to bright yellow, red, or orange. </li></ul><ul><li>But, it is not a change from a green pigment to a red pigment , as you might think. </li></ul><ul><li>Pigments are chemicals that give leaves their color. </li></ul>
  25. 25. Signs of Chemical Changes <ul><li>The green pigmen t that you see during the summer is chlorophyll (KLOHR uh fihl). </li></ul><ul><li>In autumn, however, changes in temperature and rainfall amounts cause trees to stop producing chlorophyll . </li></ul>
  26. 26. Signs of Chemical Changes <ul><li>The chlorophyll already in the leaves undergoes a chemical change into colorless chemicals. </li></ul>
  27. 27. Signs of Chemical Changes <ul><li>The pigments that produce fall colors have been present in the leaves all along. </li></ul><ul><li>However, in the summer, chlorophyll is present in large enough amounts to mask these pigments . </li></ul><ul><li>In the fall, when chlorophyll production stops, the bright pigments become visible. </li></ul>
  28. 28. Color <ul><li>The reason a half-eaten apple turns brown is that a chemical change occurs when the apple is exposed to air. </li></ul><ul><li>The color of food changes as it is cooked because a chemical change occurs. </li></ul>
  29. 29. Energy <ul><li>Another sign of a chemical change is the release or gain of energy by an object. </li></ul><ul><li>Many substances must absorb energy in order to undergo a chemical change . </li></ul><ul><li>For example, energy is absorbed during the chemical changes involved in cooking. </li></ul>
  30. 30. Energy <ul><li>Another chemical change in which a substance absorbs energy occurs during the production of cement. </li></ul><ul><li>This process begins with the heating of limestone. </li></ul><ul><li>When it absorbs energy during heating, it undergoes a chemical change in which it turns into lime and carbon dioxide. </li></ul>
  31. 31. Energy <ul><li>Energy also can be released during a chemical change . </li></ul><ul><li>Fireworks release energy in the form of light that you can see. </li></ul>
  32. 32. Odor <ul><li>When eggs and other foods spoil, they undergo chemical change . </li></ul><ul><li>The change in odor is a clue to the chemical change . </li></ul><ul><li>When you smell an odd odor in foods, such as chicken, pork, or mayonnaise, you know that the food has undergone a chemical change . </li></ul><ul><li>You can use this clue to avoid eating spoiled food and protect yourself from becoming ill. </li></ul>
  33. 33. Gases or Solids <ul><li>The formation of a gas is a clue to a chemical change . </li></ul><ul><li>The formation of a solid is another clue to a chemical change . </li></ul><ul><li>A solid that separates out of a solution during a chemical change is called a precipitate . </li></ul><ul><li>A common precipitate forms when a solution containing sodium iodide is mixed with a solution containing lead nitrate. </li></ul>
  34. 34. Not Easily Reversed <ul><li>Physical and chemical changes are different from one another. </li></ul><ul><li>After solid ice melts into liquid water, it can refreeze into solid ice if the temperature drops enough. </li></ul><ul><li>Freezing and melting are physical changes . </li></ul>
  35. 35. Not Easily Reversed <ul><li>The substances produced during a chemical change cannot be changed back into the original substances by physical means. </li></ul><ul><li>Wood that has changed into ashes and gases cannot be restored to its original form as a log. </li></ul><ul><li>The substances that existed before the chemical change no longer exist. </li></ul>
  36. 36. Chemical Versus Physical Changes <ul><li>In a physical change , the composition of a substance does not change. </li></ul><ul><li>In a chemical change , the composition of a substance does change. </li></ul><ul><li>When a substance undergoes a physical change , only its form changes. </li></ul><ul><li>In a chemical change , both form and composition change. </li></ul>
  37. 37. Chemical Versus Physical Changes <ul><li>When substances like wood and copper undergo physical changes , the original wood and copper still remain after the change. </li></ul><ul><li>When a substance undergoes a chemical change , however, the original substance is no longer present after the change. </li></ul>
  38. 38. Chemical Versus Physical Changes <ul><li>Instead, different substances are produced during the chemical change . </li></ul><ul><li>When wood and copper undergo chemical changes , wood and copper have changed into new substances with new physical and chemical properties. </li></ul>
  39. 39. Chemical Versus Physical Changes <ul><li>Physical and chemical changes are used to recycle or reuse certain materials. </li></ul>
  40. 40. Conservation of Mass <ul><li>During a chemical change , the form or the composition of the matter changes. </li></ul><ul><li>The particles within the matter rearrange to form new substances, but they are not destroyed and new particles are not created. </li></ul>
  41. 41. Conservation of Mass <ul><li>The number and type of particles remains the same. </li></ul><ul><li>As a result, the total mass of the matter is the same before and after a physical or chemical change . This is known as the law of conservation of mass . </li></ul>
  42. 42. Conservation of Mass <ul><li>In many chemical changes in which mass seems to be gained or lost, the difference is often due to a gas being given off or taken in. </li></ul><ul><li>If the gases could be contained in a chamber around the candle, you would see that the mass does not change. </li></ul>
  43. 43. Conservation of Mass <ul><li>The scientist who first performed the careful experiments necessary to prove that mass is conserved was Antoine Lavoisier (An twan . luh VWAH see ay) in the eighteenth century. </li></ul><ul><li>It was Lavoisier who recognized that the mass of gases that are given off or taken from the air during chemical changes account for any differences in mass. </li></ul>
  44. 44. MATCHING <ul><li>State </li></ul>J. Release of energy K. Mass L. Liquid I. Behavior H. Physical property G. Physical change F. Color E. Density D. Chemical property C. Chemical change B. Boiling point 1. ___an indication that a chemical change has taken place. 2. ___temperature at which liquid changes to gas. K A I D B L E H F C J G
  45. 45. MATCHING <ul><li>State </li></ul>J. Release of energy K. Mass L. Liquid I. Behavior H. Physical property G. Physical change F. Color E. Density D. Chemical property C. Chemical change B. Boiling point 3. ___a physical property of matter. 4. ___size, shape, or state of matter. K A I D B L E H F C J G
  46. 46. MATCHING <ul><li>State </li></ul>J. Release of energy K. Mass L. Liquid I. Behavior H. Physical property G. Physical change F. Color E. Density D. Chemical property C. Chemical change B. Boiling point 5. ___measure of how much of an object there is. 6. ___property that could be used to indicate physical or chemical change. K A I D B L E H F C J G
  47. 47. MATCHING <ul><li>State </li></ul>J. Release of energy K. Mass L. Liquid I. Behavior H. Physical property G. Physical change F. Color E. Density D. Chemical property C. Chemical change B. Boiling point 7. ___melting is an example. 8. ___the ability to burn is an example K A I D B L E H F C J G
  48. 48. MATCHING <ul><li>State </li></ul>J. Release of energy K. Mass L. Liquid I. Behavior H. Physical property G. Physical change F. Color E. Density D. Chemical property C. Chemical change B. Boiling point 9. ___liquid, gas, or solid. 10. ___how something acts. K A I D B L E H F C J G
  49. 49. MATCHING <ul><li>State </li></ul>J. Release of energy K. Mass L. Liquid I. Behavior H. Physical property G. Physical change F. Color E. Density D. Chemical property C. Chemical change B. Boiling point 11. ___a state of matter 12. ___rusting of iron is an example K A I D B L E H F C J G
  50. 50. MULTIPLE CHOICE 13. ____Which of these is not a physical property of matter. A. Density B. Mass D. Texture C. Ability to burn C 14. ____An example of physical change involving more than one substance is. A. Evaporating B. Rusting C. Burning D. Dissolving D
  51. 51. MULTIPLE CHOICE 15. ____an example of a change of state is A. Evaporating B. Rusting C. Burning A D. Dissolving
  52. 52. MULTIPLE CHOICE 16. ____Which of the following shows a behavioral property. A. Peeling a banana B. Iron attracted to a lodestone D. Hammer hitting a nail C. Snow melting in the Sun. B
  53. 53. MULTIPLE CHOICE 17. ____is an example of a chemical change. A. Melting of chocolate. B. Freezing of water D. Burning of paper C. Salting of food D 18. ____which of the following is an example of a chemical change A. Evaporating B. Melting C. Burning D. Sublimation C
  54. 54. MULTIPLE CHOICE 19. ____Which of these indicates that a chemical change has taken place A. Change from a liquid to a gas B. Change in shape D. Dissolving of a solid C. Release of heat energy. C
  55. 55. MULTIPLE CHOICE 20. ____the density of a material is _____. A. How much the material weighs B. The mass of a unit volume D. Whether or not the material floats in a liquid C. How much space the material takes up B
  56. 56. MULTIPLE CHOICE 21. ____The process of a liquid changing into a gas is called_______. A. Sublimation B. Condensation D. Deposition C. Vaporization C 22. ____the process of a gas changing into a liquid is called________. A. Sublimation B. Condensation C. Vaporization D. Deposition B
  57. 57. 23. ____The process of a solid changing directly into a gas, without ever becoming a liquid is called is called_______. A. Sublimation B. Condensation D. Deposition C. Vaporization A 24. ____the process in which a gas changes directly into a solid without ever becoming a liquid is called________. A. Sublimation B. Condensation C. Vaporization D. Deposition D
  58. 58. MULTIPLE CHOICE 25. ____an objects odor _____. A. Physical property B. Chemical property D. Chemical change C. Physical change A 26. ____a change in an object’s odor is the result of a _____. 27. ____the precipitation of a solid can indicate a _____. D D
  59. 59. SHORT ANSWER List 3 ways you could change the physical properties of the piece of paper Crumpling the paper Tearing the paper Coloring the paper Dissolving the paper
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