Chemistry Units 1 and 2 Crossword Puzzle

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Across
  1. 5. The concentration of a solution expressed as moles of solute per liter of solution
  2. 7. A neutral particle found in the nucleus of an atom
  3. 10. A pure substance that cannot be broken down into simpler substances by chemical means
  4. 11. A negatively charged particle found outside the nucleus of an atom
  5. 13. A substance composed of two or more elements chemically combined in fixed proportions
Down
  1. 1. A positively charged particle found in the nucleus of an atom
  2. 2. A mixture that does not have a uniform composition throughout
  3. 3. A mixture that has a uniform composition throughout
  4. 4. An atom has a mass number of 23 and an atomic number of 11. Which element is it
  5. 6. A reaction in which a substance reacts rapidly with oxygen and releases energy in the form of heat and light
  6. 8. A neutral atom contains 11 protons. How many electrons does it have
  7. 9. An atom has 8 protons and 10 electrons. Is it a cation or an anion
  8. 12. The smallest unit of an element that retains the properties of that element