Unit 02

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Across
  1. 1. A number in front of any chemical formula in a chemical equation showing the number of molecules involved in the reaction.
  2. 7. Formulas written on the right side of the yield ( → ) are the new substances formed in a chemical reaction.
  3. 9. Describes what happens in a chemical reaction. The equation identifies the starting materials (reactants) and resulting substances (product) in formula form.
  4. 10. states that mass cannot be created or destroyed.
Down
  1. 2. A change in which a substance (or substances) is changed into one or more new substances with different properties than the original substances.
  2. 3. A substance composed of two or more DIFFERENT element.
  3. 4. Two or more atoms joined together. The atoms can be the same element or different elements.
  4. 5. Formulas written on the left side of the yield ( → ) are the starting substances in a chemical reaction.
  5. 6. A way to show the number and type of atoms in a compound or a molecule with symbols and numbers.
  6. 8. A small number that is written below the normal line of letters to show the number of atoms of each element is present in a substance.