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Science Vocab

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Across
  1. 2. the starting materials in a chemical reaction
  2. 4. A closed path through which electrons flow.
  3. 7. a combination of two or more substances that are not chemically combined
  4. 8. an ion with a positive charge
  5. 10. the state in which matter takes the shape of its container and has a definite volume
  6. 13. point an object that appears to stay in place in relation to an object being observed for motion
  7. 14. A push or pull one body exerts on another.
  8. 15. one of the elements of group 18 of the periodic table, are unreactive
  9. 19. an element that is shiny and that conducts heat and electricity well
  10. 21. a meteoroid that reaches Earth's surface without burning up completely
  11. 22. The amount of time required for one-half of the nuclides in a sample of radioactive isotope to decay.
  12. 23. a wave interaction that occurs when two or more waves overlap
  13. 25. The transfer of energy through matter in which energy moves from particle to particle
  14. 26. The transfer of energy by the bulk movement of matter in which particles move from place to place in fluid, carrying the energy with them.
  15. 28. a horizontal row of elements in the periodic table
  16. 31. A mixture in which different parts can be easily distinguished.
  17. 32. The bending of waves around a barrier.
  18. 33. a relatively small, rocky body that travels through space
  19. 34. a factor that changes in an experiment in order to test a hypothesis
  20. 36. The unit of measuring current,the rate of flow of electrons in a circuit
  21. 37. the rate of motion at a given instant in time.
  22. 39. The highest point of a wave.
  23. 44. a group of atoms that are held together by chemical forces, smallest unit of matter that can exist by itself
  24. 45. a pattern, plan, representation, or description designed to show the structure or workings of an object, system, or concept
  25. 46. a homogeneous mixture throughout which two or more substances are uniformly dispersed
  26. 48. The maximum distance the particles of a waves medium vibrate from their rest position
  27. 49. A chemical equation that has the same number of atoms of each element on both sides of the equation
  28. 52. the substance in which a solute is dissolved to form a solution
  29. 53. circuit a circuit in which different loads are on separate branches
  30. 55. an atom's central region, which is made up of protons and neutrons
  31. 57. the amount of energy needed to change the temperature of 1 kg of a substance by 1°C
  32. 61. any use of the senses to gather information
  33. 62. The unit of measure for frequency.
  34. 63. an observe change in the frequency of a wave when the source or observer is moving
  35. 64. the process in which two or more nuclei with small masses join together, or fuse, to form a larger, more massive nucleus
  36. 68. the rate at which work is done
  37. 71. the change of state in which a solid becomes a liquid by adding heat
  38. 72. the speed of an object in a particular direction
  39. 73. Force exerted by every object in the universe on every other object. The amount of force depends on the masses of the objects and the distance between them.
  40. 74. a measure of the size of a body or region in three-dimensional space
  41. 76. the SI unit of force
  42. 77. a measure of the gravitational force exerted on an object; its value can change with the location of the object in the universe
  43. 78. the positively charged particles of the nucleus; the number of protons in a nucleus is the atomic number that determines the identity of an element
  44. 79. The tendency of an object to resist any change in its motion. If motionless, it tends to remain at rest; if moving, it tends to keep moving at the same speed and in the same direction.
Down
  1. 1. The rate at which velocity changes over time
  2. 3. a natural or artificial body that revolves around a planet
  3. 5. anything that has mass and takes up space
  4. 6. an electron that is found in the outermost shell of an atom and determines the atom's chemical properties
  5. 7. the sum of the numbers of protons and neutrons in the nucleus of an atom
  6. 9. an element that has properties of both metals and nonmetals
  7. 11. A material that does not allow heat or electrons to move through it easily.
  8. 12. a bright streak of light that results when a meteoroid burns up in Earth's atmosphere
  9. 16. A characteristic of a substance that indicates whether it can undergo a specific chemical change
  10. 17. the force that results from combining all the forces exerted on an object
  11. 18. The force that holds together the atoms in a compound; it occurs because atoms of most elements become more stable by losing, gaining and sharing electrons
  12. 20. A mixture in which different materials are blended evenly so that the mixture is the same throughout; also called a solution.
  13. 24. all the frequencies or wave lenghts of electromagnectic radiation
  14. 25. A change in which one or0 more substances are converted to different substances
  15. 27. atoms that have the same number of protons but have different numbers of neutrons
  16. 29. a charged election emitted during certain types of radioactive decay
  17. 30. acceleration acceleration in which velocity increases
  18. 35. the amount of force exerted per unit area of a surface
  19. 38. the rate at which an object moves; speed depends on the distance traveled and the time taken to travel that distance
  20. 40. a large cloud of gas and dust in interstellar space; a region in space where stars are born
  21. 41. an element that conducts heat and electricity poorly
  22. 42. The temperature at which vapor bubbles form in a liquid and rise to the surface,increasing evaporation
  23. 43. the SI unit of pressure
  24. 47. a measure of the amount of matter in an object
  25. 50. A particle of nuclear radiation emitted from a decaying
  26. 51. a wave in which the particles of the medium vibrate back and forth along the path that the wave travels
  27. 53. energy the energy of position or shape
  28. 54. A testable prediction used to see how something works or to solve a problem.
  29. 56. the energy of motion;kinetic energy depends on speed and mass
  30. 57. a series of steps followed to solve problems
  31. 58. The force that causes an object moving along a circular path to move toward the center of the path
  32. 59. The force that opposes motion between two surfaces that are touching each other.
  33. 60. The change of substances to different substances
  34. 65. the substance that is dissolved to form a solution
  35. 66. a subatomic particle that has no charge and is in the nucleus of an atom
  36. 67. the state of matter in which the volume and shape of a substance are fixed
  37. 69. machines the six machines from which all other machines are constructed: a lever, an inclined plane, a wedge, a screw, a wheel and axle, and a pulley
  38. 70. an object's change in position relative to a reference point
  39. 75. a substance that forms in a chemical reaction