Chapter 7 PS Vocabulary

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Across
  1. 4. - a mass of one mole of a substance.
  2. 6. - a process that rearranges the atoms in one or more substances into one or more new substances.
  3. 8. - a chemical reaction in which one element in a compound is replaced by another element; also known as single-displacement reaction.
  4. 10. - the model that states for a reaction to occur, the reactant particles must collide with each other, with the proper alignment, and with enough energy.
  5. 11. reaction - a chemical reaction in which two compounds swap cations or anions with each other; also known as double-displacement reaction.
  6. 16. - SI fundamental unit of for the quantity of mater in a substance; a count equal to 6.022 x 10^23
  7. 17. - a chemical reaction in which two or more reactants combine into a single, more complex product.
  8. 18. - a chemical reaction that releases more thermal energy than it absorbs.
  9. 20. - a gain of electrons in a chemical reaction.
  10. 21. - a combination of chemical formulas and symbols that models a chemical reaction
  11. 22. - a substance that helps a reaction happen faster but is not used up in the reaction.
  12. 23. - a number is placed in front of a chemical formula within a chemical equation that shows how many units of a reactant or product are needed to balance the chemical equation.
  13. 24. Chatelier’s-principle -the principle that states that a chemical system in equilibrium will adjust its equilibrium position in such a way as to reduce the effects of any changes made to the system.
  14. 25. - a substance that slows the reaction rate by reducing the effectiveness of catalysts.
Down
  1. 1. - the law that states that energy can not be created or destroyed but can be transformed between objects.
  2. 2. - a loss of electrons in a chemical reaction.
  3. 3. - the speed of a reaction.
  4. 5. - a reaction in which the products can react together to re-form the original reactants.
  5. 7. - the state that occurs when forward and reverse reactions each happen at the same rate.
  6. 9. - a chemical reaction in which a single reactant breaks down into two or more products.
  7. 12. - a chemical reaction that absorbs more thermal energy than it releases
  8. 13. - an exothermic chemical reaction in which a fuel reacts with oxygen.
  9. 14. - a substance that is formed during a chemical reaction.
  10. 15. - a substance that enters into a chemical reaction.
  11. 19. - the minimum energy needed for a chemical reaction to occur.