Chemistry Vocabulary

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Across
  1. 1. a letter abbreviation of an element name; always starts with a capital letter
  2. 3. consists of multiple different substances that are not evenly distributed so each sample of the mixture may have different proportions of components
  3. 7. describes a chemical reaction by showing how many atoms in the reactants are rearranged to form new substances in the products
  4. 9. the smallest particle of matter that has distinct properties because of its nucleus which contains protons and neutrons and an electron cloud
  5. 10. the chemical process by which plants (and some bacteria) produce their own food energy using the energy from sunlight to convert carbon dioxide and water into oxygen and glucose (food)
  6. 12. substance (same throughout) that is made up of two or more different elements bonded together. For example H20 all water molecules are made the same
  7. 14. the starting materials found in a chemical equation(left side) that will react together
  8. 15. a set of chemical symbols (letters) and subscripts (numbers) showing which elements are bonded together to from a compound
  9. 16. 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)
  10. 17. a pure substance (same throughout) that is made up of one type of atom
  11. 18. the small number behind the element indicates the number of atoms for that element. For example, in the compound H20 there are 2 atoms of Hydrogen
Down
  1. 2. the big number in front of a formula that indicates how many molecule groups
  2. 4. a chart of all the known elements on Earth organized based on the physical and chemical properties of each
  3. 5. change in form or appearance but not chemical make-up
  4. 6. mass stays the same during a reaction. The total mass of the reactants is equal to the total mass of the products(the type and number of atoms stay the same) because matter is not created or destroyed just rearranged
  5. 8. a substance is evenly distributed (or dissolved) within a liquid, gas, or solid
  6. 10. substance formed as a result of a chemical reaction (right side)
  7. 11. group of atoms bonded together composed of a single element or a single compound. All compounds are molecules but not all molecules are compounds
  8. 13. consists of multiple different substances that are evenly distributed so each sample of the mixture will have the same proportion of components