Science cross puzzle

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Across
  1. 2. A measure of how resistant a solid is to scratching
  2. 5. A measure of a material's ability to conduct heat
  3. 8. How a material responds to a magnetic field
  4. 9. The degree to which a substance can damage an organism
Down
  1. 1. Characteristics observed only during a chemical reaction
  2. 3. How easily a substance catches fire and burns
  3. 4. The ability of a substance to dissolve in a liquid
  4. 6. The amount of three-dimensional space an object takes up
  5. 7. A measure of the amount of matter in an object