Chapter 2 study guide

1. reaction A reaction that release energy in the form of heat is called an exothermic reaction
3. system In an open system matter can enter from or escape to the surroundings
6. A material used to decrease the rate of a reaction is an inhibitor
7. The cells in our body containing biochemical catalysts
8. It breaks down compounds into simpler products
10. equation A chemical equation is short and easy way to to show chemical reactions using symbols instead of words
12. The substance you have at the beginning are called reactants
13. A solid that forms from solution during a chemical reaction is called precipitate
17. A catalyst is a material that increases the rate of a reaction by lowering the activation energy.
18. In chemistry when two or more elements or compounds combine to make a more complex substance .
19. When one element replaces another in a compound or when two elements in different compounds trade places.
24. of mass It means that during a chemical reaction matter is not created or destroyed.
25. system In a closed system matter is not allowed to enter or leave

2. A coefficient is the number placed in front of a chemical formula in an equation.
4. property A physical property is a characteristic of a substance that can be observed without changing the substance into another substance.
5. reaction A change in matter that produces one or more substances is a chemical change or chemical change.
9. Is the amount of a substance in a given volume
11. When the reaction is complete you have new substances called the products
14. reaction An endothermic reaction is a reaction in which energy is absorbed
15. Is a rapid reaction between oxygen and a substance called a fuel.
16. is anything that has mass and takes up space.
20. change A physical change is any change that alters the form or appearance of a substance but does not make the substance into another substance.
21. energy Is the minimum amount of energy needed to start a chemical reaction
22. The study of matter and how matter changes is called chemistry
23. A fuel is a material that releases energy when it burns
24. property A chemical property is a characteristics of a substance that describes its ability to change into another substance