Workbook 

Unit 4-2 pages 33-80.

Read pages 49, 63, and 69 for 5 facts on test 4-2.  

Complete pages 44-45, 51-53, 55, 70, and 71.

Read/discuss page 63.

Answers below  page 44-45

6, 12

5. 12

3.  There are 2 hydrogen and 4 oxygen atoms left. 

6, 21

6, 21

The number of atoms stays the same.  The mass stays the same.  The atoms are rearranged.

p. 51 2 A   3 C

p. 52  

4. Color change and strength changes which indicate a reaction may have taken place.

5. The mass and number of atoms stays the same.

53.   A-

EX. Heat and light energy is released which usually results in a rearrangement of atoms.

55.

  Chemical reaction    Person receives the heat -à Exothermic

   Chemical reaction          Package receives the heatà endothermic.

      Heat energy

70.  6 CO2 + 6H2O  à   C6H12O6   +   6 O2

Endothermic  heat absorbed

Bonds contain more energy.

Exothermic heat released

Bonds contain less energy.

71  3. B   4. C