Chapter 7

3. - a chemical reaction in which two compounds swap cations or anions with each other; also known as double-displacement reaction.
4. - a chemical reaction in which two or more reactants combine into a single, more complex product.
5. - a chemical reaction that releases more thermal energy than it absorbs.
9. - 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.
14. - a process that rearranges the atoms in one or more substances into one or more new substances.
16. - a mass of one mole of a substance.
18. - the minimum energy needed for a chemical reaction to occur.
19. - an exothermic chemical reaction in which a fuel reacts with oxygen.
20. - 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.
21. - a chemical reaction in which one element in a compound is replaced by another element; also known as single-displacement reaction.
23. - a substance that enters into a chemical reaction.
24. - a chemical reaction in which a single reactant breaks down into two or more products.
25. - the law that states that energy can not be created or destroyed but can be transformed between objects.

1. - a substance that helps a reaction happen faster but is not used up in the reaction.
2. - a gain of electrons in a chemical reaction.
6. - a combination of chemical formulas and symbols that models a chemical reaction
7. - a substance that is formed during a chemical reaction.
8. - a chemical reaction that absorbs more thermal energy than it releases
10. - the state that occurs when forward and reverse reactions each happen at the same rate.
11. - the speed of a reaction.
12. - a reaction in which the products can react together to reform the original reactants.
13. - a substance that slows the reaction rate by reducing the effectiveness of catalysts.
15. - SI fundamental unit of for the quantity of mater in a substance; a count equal to 6.022 x 10^23
17. -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.
22. - a loss of electrons in a chemical reaction.