7th Grade Key Terms

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Across
  1. 3. a property that describes how well one substance dissolves in another substance
  2. 5. to change state from a solid to a gas
  3. 6. a push or a pull on an object
  4. 10. to change state from a gas to a solid
  5. 11. a solid structure whose atoms or molecules are arranged in a repeating, three-dimensional pattern
  6. 15. an individual particle of an element
  7. 17. a limitation on the range of possible solutions to a design
  8. 20. a representation of an object which makes important aspects easier to see
  9. 23. when referring to forces, pulling together
  10. 24. a full-scale, working model of a design that can be tested as part of the design process
  11. 27. a chemical reaction that releases more energy to the surroundings than it absorbs
  12. 29. a property that describes the mass of a certain volume of matter
  13. 31. the requirements that must be met for an engineering solution to be successful
  14. 32. the state of matter in which atoms or molecules are completely separated from one another by empty space and can move around independently of one another
  15. 34. the amount of force exerted over a certain area
  16. 36. a chemical reaction that absorbs more energy from the surroundings than it releases
  17. 38. to change state from a gas to a liquid
  18. 39. a substance that exists before a chemical reaction takes place and changes as a result of the reaction
  19. 40. to change state from a liquid to a gas at the surface of the liquid
  20. 41. a unique particle of matter that is a fundamental building block of matter
Down
  1. 1. a shorthand notation of one, two, or three letters that represent the name of the element
  2. 2. a new substance that forms during a chemical reaction
  3. 4. a measure of the average kinetic energy of the particles of a substance
  4. 7. an amount of something measured per unit of something else
  5. 8. the rate of change of an object’s velocity; can be speeding up, slowing down, or changing direction
  6. 9. a characteristic of matter
  7. 12. on a scale that people can see with their eyes
  8. 13. the distance and direction that an object is from a reference point
  9. 14. able to be broken down into smaller molecules by biological agents, such as bacteria
  10. 16. the path that an object in space follows around another object due to gravitational forces between the objects
  11. 18. the state of matter in which atoms or molecules are closely packed and touching one another in fixed positions
  12. 19. a group of two or more atoms that are held together by chemical bonds
  13. 21. a force that opposes motion between two surfaces that are touching
  14. 22. a unit used to measure the strength of a force
  15. 24. a type of extended structure that is made of many smaller, repeating subunits in a chain
  16. 25. matter that has a constant chemical composition and characteristics
  17. 26. the amount of gravitational force on an object
  18. 28. the state of matter in which atoms or molecules are closely packed and touching one another but are not held in fixed positions
  19. 30. the amount of matter in an object or sample
  20. 33. an object’s speed and direction of motion
  21. 35. the rate that describes how far an object moves over time
  22. 37. thermal energy transferred from a warmer object to a cooler one