Chemistry Crossword Puzzle

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Across
  1. 4. The number of protons in the nucleus of an atom.
  2. 7. the substance that does the dissolving
  3. 9. An element that has physical and chemical properties of both metals and nonmetals; can be a semiconductor
  4. 14. A mixture in which substances are not distributed evenly. (You can see the different parts.)
  5. 15. Total mass of the protons and neutrons in an atom, measured in atomic mass units; the number of protons + neutrons
  6. 16. A change in matter that cannot be reversed and results in a new substance being formed; signs of chemical change include gas production (bubbles), color change, temperature change, and/or precipitate forms.
  7. 19. In a solution, the substance that dissolves.
  8. 20. Used to describe a material that can be hammered or beaten into thin sheets
Down
  1. 1. The tendency of a substance to undergo chemical changes.
  2. 2. An element that usually is a gas or brittle solid at room temperature, is not malleable or ductile, is a poor conductor of heat and electricity, and is typically dull.
  3. 3. The ability of a substance to be pulled into a wire.
  4. 5. A solid that forms during a chemical reaction that takes place in a solutio
  5. 6. A vertical column of the elements in the periodic table- can show the number of valence electrons.
  6. 8. group of two or more atoms held together by chemical bonds.
  7. 10. A change in matter that usually can be be reversed such as size, shape, or state.
  8. 11. horizontal row of elements in the periodic table- shows number of electron shells for an element
  9. 12. Hard substance that will break or shatter easily
  10. 13. The elements or compounds produced by a chemical reaction.
  11. 17. An atom that has lost or gained electrons and therefore has an electrical charge.
  12. 18. A pure substance that forms when two or more elements are held together by a chemical bond; Every molecule of a compound is the same.