Year 9 Summer Crossword

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Across
  1. 1. variable we deliberately change in an experiment
  2. 4. Methods or materials used to reduce unwanted energy transfer.
  3. 5. A unit of time equal to 60 minutes.
  4. 7. energy passes from one store to another through one of these
  5. 8. (6,7) Two panes of glass separated by air or vacuum to reduce heat loss.
  6. 10. A surface that is a very good absorber and emitter of infrared radiation.
  7. 11. (9,8) measures volume of fluids
  8. 13. A surface that is a poor absorber and poor emitter of infrared radiation.
  9. 15. The amount of space occupied by an object or substance.
  10. 18. measures time
  11. 20. High-energy electromagnetic radiation emitted from a nucleus.
  12. 21. A process whose exact outcome cannot be predicted for an individual nucleus.
  13. 23. A push or pull that can change the motion or shape of an object.
  14. 26. variable that we measure as the result of deliberately changing another variable
  15. 27. A unit of length equal to one hundredth of a metre (0.01 m).
  16. 29. measures mass of objects
  17. 30. measures length
  18. 35. A positively charged particle found in the nucleus.
  19. 37. The rate at which radioactive nuclei decay.
  20. 39. number - total protons and neutrons in the nucleus.
  21. 40. physicist who wrote down the laws of motion
  22. 41. Variable we try to keep the same in an experiment
  23. 43. Radiation - like a helium nucleus consisting of 2 protons and 2 neutrons.
  24. 45. The SI unit of activity. One becquerel means one decay per second.
  25. 46. The SI unit of pressure, equal to 1 N/m².
  26. 49. (kg) The SI unit of mass.
  27. 50. The force acting per unit area.
  28. 51. Space between two walls where we might put insulating materials
  29. 53. The transfer of thermal energy by the movement of fluids (liquids and gases).
  30. 56. The mass of a substance per unit volume.
  31. 58. The smallest particle of an element
  32. 61. A material that slows down the transfer of thermal energy
  33. 62. A fast-moving electron emitted from the nucleus.
  34. 64. The SI unit of force.
  35. 65. Electromagnetic radiation emitted by all objects above absolute zero temperature.
  36. 66. The surface covered by an object.
  37. 69. The SI unit of temperature.
  38. 70. A nucleus that can change by emitting radiation is said to be…
  39. 71. A proton or neutron.
  40. 72. was shouted by an ancient scientist when he lept out of the bath
  41. 74. Waves do this when they meet a surface
  42. 75. The spontaneous emission of radiation from unstable nuclei.
Down
  1. 2. (7,6) The total internal energy of an object due to the movement and position of its particles.
  2. 3. An ion formed when an atom loses electrons.
  3. 6. type of experimental error when reading from a scale
  4. 9. Heat transfer in solids
  5. 12. worked out the density of a gold crown
  6. 14. An ion formed when an atom gains electrons.
  7. 16. The SI unit of time.
  8. 17. The transfer of thermal energy by infrared electromagnetic waves.
  9. 19. The continuous movement of gas particles in all directions.
  10. 22. (11, 5) process where unstable atoms release particles and energy
  11. 24. The transfer of thermal energy through a substance by particle collisions and vibrations, without the substance moving as a whole.
  12. 25. The SI unit of length.
  13. 28. A measure of how hot or cold something is.
  14. 31. The SI unit of energy transferred or work done.
  15. 32. A shorthand notation showing the atomic number and mass number of a nucleus.
  16. 33. Atoms of the same element with the same number of protons but different numbers of neutrons.
  17. 34. number of protons in the nucleus of an atom.
  18. 36. The dense central part of an atom containing protons and neutrons.
  19. 38. measures temperature
  20. 42. e.g. atoms and molecules
  21. 44. A container designed to reduce energy transfer by conduction, convection and radiation.
  22. 47. (7,5)measures long distances
  23. 48. The SI unit of power
  24. 52. Radiation that can remove electrons from atoms
  25. 54. A neutral particle found in the nucleus.
  26. 55. The process of giving out radiation.
  27. 57. A charged particle formed when an atom gains or loses electrons.
  28. 59. A space containing no particles
  29. 60. A unit of time equal to 60 seconds.
  30. 63. The process of receiving radiation.
  31. 67. A negatively charged particle that moves around the nucleus.
  32. 68. The amount of matter in an object.
  33. 73. A unit used to measure temperature.