Chapter 7 PHY-211

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