Chemistry

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Across
  1. 2. Substance formed as a result of a chemical reaction (right side).
  2. 4. a letter abbreviation of an element name; always starts with a capital letter.
  3. 6. during a reaction a new substance is made when the atoms of the original substance are rearranged to make something new.(evidence: precipitate, energy change, gas, and sometimes color)
  4. 7. The starting materials found in a chemical equation(left side) that will react together.
  5. 9. mass stays the sames during reaction. The total mass of the reactants is equal to the total mass of the products (the type and number of atoms stays the same) because matter can not be created nor destroyed just rearranged.
Down
  1. 1. a set of chemical symbols(letters)
  2. 3. group of atoms bonded together composed of a single element or a single compound. ALl compounds are molecules but not all molecules are compounds.
  3. 5. describes a chemical reaction by showing how atoms in the reactants are rearranged to form new substances in the products.
  4. 8. The small number behind the element indicates the number of atoms for that element. For example, in the compound H2O there are two hydrogen atoms.