Science Review 1

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Across
  1. 5. semi-conductors
  2. 6. colours produced by excitation of gases in the atmosphere by solar winds entering Earth’s atmosphere
  3. 9. Shortest and longest days of the year
  4. 12. Table salt, or sodium chloride, is an example of a _________
  5. 14. Charging by ______ occurs when two objects with different amounts of electric charge come in contact and electrons move from one object to the other.
  6. 15. term describes a series of changes in the biotic and abiotic features of an ecosystem that occur over time after a disturbance
  7. 16. A(n) ___________variable is one that is changed by the investigator
  8. 17. is the process by which sugar and oxygen are converted into carbon dioxide, water, and energy to provide energy for the cell.
  9. 20. The process of removing charges from objects by contact with a large, neutral object is called
  10. 21. name for a new solid that forms when two liquids are mixed
  11. 22. Any condition that changes or varies the outcome of a scientific inquiry is called a
  12. 25. A(n) ________species is a non-native species that has a negative impact on the natural environment.
  13. 29. group of elements reacts violently with water
  14. 31. group 17 on the periodic table
  15. 33. Metals combine with ___________ to form ionic compounds
  16. 34. The day/night cycle on Earth is caused by the Earth’s
  17. 35. A(n) ________ cannot be broken down into simpler chemical substances by any physical or chemical means
  18. 36. allows electrons to move easily through it
  19. 38. type of compound that has identical individual particles
  20. 40. non-living
  21. 41. The ________ planets are those found closest to the Sun
Down
  1. 1. increasing concentrations of toxic substances as you move up the food chain
  2. 2. The small number that follows the symbol for an element in a chemical formula and shows how many atoms of the element are present is called the
  3. 3. Describes a variable that changes in response to the deliberate change in another variable
  4. 4. voltmeter must be wired in ________ to function properly
  5. 7. unit of measurement for all forms of energy including electrical energy
  6. 8. group 2 on the periodic table
  7. 10. When day and night are exactly equal
  8. 11. ammeter must be wired in ______ to function properly
  9. 13. A year is equal to one _______ of the Earth
  10. 18. device to measure resistance
  11. 19. 1.5 x 10^8 km
  12. 21. The odour of a substance is a _______ property
  13. 23. Earth’s ________ is all the places on Earth where living things can exist.
  14. 24. device to measure current
  15. 26. gases group 18 on the periodic table
  16. 27. Astronomers use_______ to measure the distance to stars or other celestial objects outside of the Solar System.
  17. 28. Any object that exists in space is called a
  18. 30. Looking down on the North Pole, the planets revolve around the Sun in this direction
  19. 32. The change in temperature of Earth during the year (seasons) is caused by the Earth’s
  20. 37. often called a shooting star
  21. 39. One joule per second