Biology

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Across
  1. 4. a pure substance formed when two or more different elements combine
  2. 5. another name for a homogeneous mixture
  3. 6. compound in which the atoms are held together by covalent bonds
  4. 9. combination of two or more substances
  5. 10. special protiens
Down
  1. 1. negatively charged
  2. 2. positivity charged particles
  3. 3. substance that is dissolved in the solvent
  4. 7. pure substance that can't be broken down into other substances by physical or chemical means
  5. 8. building blocks of matter