SCIENCE

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Across
  1. 3. measures the amount of matter in a substance or an object.
  2. 4. a state of matter where the particles move very quickly because of the empty space surrounding them.
  3. 8. is how much space matter can take up.
  4. 9. are giant covalent substances held together by covalent bonds. They decompose before melting, they are extremely hard and they are non-conductors.
  5. 11. these types of solids are held by metallic bonds. They are also good conductors of heat and electricity and they have a wide range of melting points.
  6. 16. these type of solids are held together by ionic bonds, are non-conductors of electricity and have a high melting point.
  7. 19. a type of change where atoms are rearranged and the reaction is accompanied by an energy change as new products are generated.
  8. 21. the temperature a substance changes its state from a solid to liquid.
  9. 22. this theory was established to explain the properties of matter
  10. 23. is a change from gas to liquid
  11. 25. the force of gravity on an object.
  12. 26. these state of matter are made up of electrically charged particles.
  13. 27. is a process of changing solid to gas directly without passing through the liquid phase.
  14. 29. when the change only affects the physical properties of a substance but not its chemical composition it is called _______.
  15. 30. the temperature at which a liquid solidifies.
Down
  1. 1. a state of matter of a dilute gas of bosons cooled to temperatures close to absolute zero.
  2. 2. groups of atoms bonded together.
  3. 5. a thin layer of particles that are strongly attracted to each other than they are to the particles surrounding them
  4. 6. it is the tendency for the same kind of particles to be attracted to one another.
  5. 7. point, it is the temperature at which the vapor pressure of the liquid becomes equal to the pressure in the surroundings of the liquid
  6. 10. is a process of changing gas to solid without passing through the liquid phase
  7. 12. is the pressure exerted by the vapor/liquid in a close container
  8. 13. this state of matter is an intermediate phase between solid and gas. It has no definite shape because the movement of the particles causes them to vary in shape.
  9. 14. is a measure of how much liquid resists flowing freely. A thinner substance is said to have a low viscosity, while thick substances have high viscosity
  10. 15. a property of a liquid that describes how readily a substance vaporizes.
  11. 17. this phase of matter is very strong and hard because their particles are held together very closely.
  12. 18. a type of solid that's held together by the same kind of forces that hold liquids together.
  13. 20. is a change of a phase from liquid to solid
  14. 24. is the process where liquid turns to gas
  15. 28. is a phase change from solid to liquid