Science Vocabulary 7

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Across
  1. 4. A reaction in which the products can react together to re-form the original reactants.
  2. 5. A process that rearranges the atoms in one or more substances into one or more new substances.
  3. 8. 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.
  4. 9. A substance that is formed during a chemical reaction.
  5. 10. A chemical reaction that absorbs more thermal energy than it releases.
  6. 13. The state that occurs when forward and reverse reactions each happen at the same rate.
  7. 16. The speed of a reaction.
  8. 17. A loss of electrons in a chemical reaction.
  9. 19. An exothermic chemical reaction in which a fuel reacts with oxygen.
  10. 21. A substance that enters into a chemical reaction.
  11. 22. A chemical reaction that releases more thermal energy than it absorbs.
  12. 24. A substance that slows the rate of a reaction by reducing the effectiveness of catalysts.
  13. 25. SI fundamental unit for the quantity of matter in a substance; a count equal to 6.022 × 1023.
Down
  1. 1. The minimum energy needed for a chemical reaction to occur.
  2. 2. A chemical reaction in which two compounds swap cations or anions with each other; also known as a double-displacement reaction.
  3. 3. 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.
  4. 6. The mass of one mole of a substance.
  5. 7. A chemical reaction in which two or more reactants combine into a single, more complex product.
  6. 11. A gain of electrons in a chemical reaction.
  7. 12. A chemical reaction in which one element in a compound is replaced by another element; also known as a single-displacement reaction.
  8. 14. 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.
  9. 15. A chemical reaction in which a single reactant breaks down into two or more products.
  10. 18. A substance that helps a reaction happen faster but is not used up in the reaction.
  11. 20. A combination of chemical formulas and symbols that models a chemical reaction.
  12. 23. 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.