Physical Science Unit 8 Vocab

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Across
  1. 8. a chemical reaction in which two compounds exchange positive ions and form two new compounds
  2. 10. a neutral group of atoms that are joined together by one or more covalent bonds
  3. 13. the rate at which reactants change into products over time
  4. 15. a covalently bonded group of atoms that has a positive or negative charge and acts as a unit
  5. 16. a diagram of an atom, ion or molecule in which each dot represents a valence electron
  6. 18. an amount of a substance that contains approximately 6.02 x 1023 particles of a substance
  7. 19. an ion with a positive charge
  8. 21. a covalent bond in which electrons are not shared equally
  9. 23. a mixture of two or more elements, at least one of which is a metal, that has the characteristic properties of a metal
  10. 25. the force that holds cation and anions together
  11. 26. numbers that appear before a formula in a chemical equation to show the relation proportions of each reactant and product
  12. 28. the mass of one mole of a substance
  13. 29. an atom or group of atoms that has a positive or negative charge
  14. 30. a chemical reaction in which the conversion of reactants into products and the conversion of products into reactants happens at the same time
  15. 32. a representation of a chemical reaction in which the reactants and products are expressed as formulas
  16. 33. a substance that undergoes change in a physical reaction
Down
  1. 1. notation that shows what elements a compound contains and the ratio of the atoms or ions of these elements in the compound
  2. 2. a chemical reaction in which a substance reacts rapidly with oxygen, often producing heat and light
  3. 3. chemical reaction in which a compound and an element exchange positive ions and form a new compound and lone element
  4. 4. the energy stored in chemical bonds
  5. 5. a chemical bond in which two atoms share a pair of valence electrons
  6. 6. the attraction between a metal cation and the shared electrons that surround it
  7. 7. new substances formed as a result of a chemical reaction
  8. 9. a chemical reaction that absorbs energy to its surroundings
  9. 11. an ion with a negative charge
  10. 12. a chemical reaction that releases energy to its surroundings
  11. 14. a chemical reaction in which one substance is oxidized (loses electrons) and one substance is reduced (gains electrons)
  12. 17. a chemical reaction in which a compound breaks down into tow or more simpler substances
  13. 20. a chemical reaction in which two or more substances react to form a single substance
  14. 22. the force that holds atoms or ions together as a unit
  15. 24. a state in which the forward and reverse paths of a physical or chemical change take place at the same rate
  16. 27. solids whose particles are arranged in a lattice structure
  17. 31. a substance that affects the rate of a chemical reaction without being used up in the reaction