5 Written Questions

1. Two or more substances combine to form one new substance in ____________ reactions.
2. In the chemical reaction known as _________, one element displaces another in a compound.
3. Any reaction that gives off thermal energy; the products have less energy than the reactants
4. __________ are calculations used to find the masses of materials involved in reactions.
5. Any reaction who' products have more energy than the reactants; the container would feel could because the products take thermal energy out of the surroundings and absorb the energy into their chemical bonds

5 Multiple Choice Questions

1. _______ are the starting substances in a chemical reaction.
   1. Reactants
   2. Combustion
   3. Products
   4. Synthesis
2. The breaking up of substances into simpler substances when energy is supplied is called _________.
   1. Synthesis
   2. Combustion
   3. Decomposition
   4. Products
3. The process by which one or more substances are changed into one or more different substances is called a ________.
   1. Endothermic reaction
   2. Chemical reaction
   3. Combustion
   4. Exothermic reactions
4. The ______ of a product is expressed as actual amount of product over theoretical amount of product x 100%
   1. Percentage yield
   2. Decomposition
   3. Reactants
   4. Synthesis
5. The reaction of an organic compound as it burns in air is called ___________.
   1. Combustion
   2. Products
   3. Decomposition
   4. Synthesis

4 True/False Question

1. Products → ________ is the term referring to the substances formed by a chemical reaction.
   

   True        False

2. Mass-energy problems → __________ are calculations used to find the masses of materials involved in reactions.
   

   True        False

3. Stoichiometry → Two or more substances combine to form one new substance in ____________ reactions.
   

   True        False

4. Double displacement → In the chemical reaction known as _________, one element displaces another in a compound.
   

   True        False