5 Written Questions

1. the amount of a substance in a given volume
2. matter is not allowed to enter or leave
3. a short, easy way to show a chemical reaction, using symbols instead of words
4. a reaction in which energy is absorbed
5. any change that alters the form or appearance of a substance but that does not make the substance into another substance

5 Matching Questions

1. reactant
2. activation energy
3. chemical reaction
4. enzyme
5. open system

1. a A change in matter that produces one or more new substances
2. b A substance that enters into a chemical reaction
3. c the minimum amount of energy needed to start a chemical reaction
4. d A system in which matter can enter from or escape to the surroundings
5. e A biological catalyst that lowers the activation energy of reactions in cells

5 Multiple Choice Questions

1. A chemical reaction in which two or more simple substances combine to form a new, more complex substance
   1. synthesis
   2. catalyst
   3. chemistry
   4. matter
2. A solid that forms from a solution during a chemical reaction
   1. inhibitor
   2. precipitate
   3. reactant
   4. chemistry
3. The principle stating that matter is not created or destroyed during a chemical reaction
   1. concentration
   2. conservation of mass
   3. activation energy
   4. coefficient
4. A reaction in which one element replaces another in a compound or when two elements in different compounds trade places
   1. coefficient
   2. replacement
   3. reactant
   4. enzyme
5. A material used to decrease the rate of a reaction
   1. inhibitor
   2. matter
   3. enzyme
   4. chemistry

5 True/False Questions

1. chemical property → a characteristic of a substance that describes its ability to change into other substances

   True        False

2. decomposition → A solid that forms from a solution during a chemical reaction

   True        False

3. physical property → a characteristic of a substance that can be observed without changing the substance into another substance

   True        False

4. chemistry → The study of matter and how matter changes

   True        False

5. catalyst → A substance that enters into a chemical reaction

   True        False