1. The document discusses different types of changes that can occur to materials and substances. It defines a chemical change as one where a material loses its original substance and forms a new one, as indicated by changes in properties like color, odor, smell, or the production of bubbles or heat. 2. Examples are provided of materials that undergo chemical changes, like rotten cabbage, rusted iron nails, and cooked rice due to reactions like decay, rusting, and cooking respectively. 3. The reader is prompted to identify whether certain changes like decaying fruits or rusting nails involve chemical or physical changes.

1. Directions: Tell whether the changes took
place is physical or not. Say P for
physical and NP for not physical.
____ 1. drying of wet laundry
____ 2. sawing of lumber
____ 3. burning of paper
____ 4. melting of ice
____ 5. solidifying of wax
____ 6. evaporation of water
____ 7. souring of milk
____ 8. breaking of rocks
____ 9. freezing of water
____ 10. digestion of food

2. What happened to the nail?
When the nail change in color, what is
the new material formed?
Can we bring back the rust into its
original material?

3. Complete the missing letter to form a
word then read it. Use picture as your
guide.
1. b _r_i_g of wood 2. co_bin_ti_n of
elements

4. 3. ch_mi_al reaction 4. che_i_a_s

5. 5. r_st_ng of nails

6. Changes happen around us but
we do not notice them whether it
form a new substance or not. When a
material or substance lost its original
substance then a chemical change
has taken place due to chemical
reaction. There are certain clues that
indicate the occurrence of chemical
change like a change in color, odor,
taste, formation of bubbles and
release of heat.

8. Directions: Identify which of the
following materials undergo
chemical change. Tell also the
condition that brought changes to
the materials.
1. rotten cabbage
2. rusted iron nails
3. cooked rice
4. crushed garlic
5. grated coconut

9. Directions: Write C if the
change happen is chemical
and P if it is physical.
______ 1. decaying fruits
______ 2. fruit falling from a tree
______ 3. ripening fruits
______ 4. chopping wood
______ 5. rusting of nails

10. Directions : Do this activity at home.
Procedure:
1. Get a piece of charcoal.
2. Examine it carefully.
3. Describe the charcoal’s
appearance.
Questions:
Where does charcoal came from?
Can you bring back charcoal to its
original form?
Why or why not?