Physical Science midterm thing

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Across
  1. 5. combination of two or more substances that are not chemicaly combined
  2. 7. a substance that cannot be separated or broken down into simpler substances by chemical means
  3. 8. the ability of a substance to react in the presence of oxygen and burn when exposed to a flame
  4. 10. the temperature at which a liquid becomes a gas
  5. 12. the ratio of the mass of a substance to the volume of a substance
  6. 13. the smallest unit of a substance that keeps all of the physical and chemical properties of that substance
Down
  1. 1. the temperature and pressure at which a solid becomes a liquid
  2. 2. a combination of chemical symbols and numbers to represent a substance
  3. 3. The smallest unit of an element
  4. 4. the scientific study of the composition, structure, and properties of matter and the changes that matter undergoes
  5. 5. anything that has mass and takes up space
  6. 6. the ability of a substance to combine chemically with another substance
  7. 9. substance made up of atoms of two or more different elements that are chemically combined
  8. 11. a sample of matter that has definite chemical and physical properties