1. Daily TAKS Connection: Physical and Chemical Changes
IPC(8) The student knows that changes in matter affect everyday life. The student is expected to:
(A) Distinguish between physical and chemical changes in matter such as oxidation, digestion, changes in states, and stages in the rock cycle.

2. Day 1: Construct a two tab foldable
Materials
Sheet of paper
scissors
Instructions:
Hamburger fold the handout along center fold line
Cut along dashed line from edge to center fold
Color “Physical Changes” flap
Color “Chemical Changes” flap a second color

3. Day 2: Notes
Record the following notes under the “Physical Changes” flap
Identity of material DOES NOT change
Ex: when you crush ice, the resulting material is still ice
Includes: changes in state (evaporation, condensation, melting, boiling, freezing)
More words to look for:

4. Day 2: Notes - ID the word(s) indicating a physical change is taking place in each of the following phrases. Record the words under the physical changes flap after “more words to look for”.
spoonful of sugar is dissolved in a cup of coffee.
lead melting
copper wire is cut into smaller pieces.
water molecule gains enough energy to enter the vapor phase
antifreeze is added to a car radiator to lower the freezing point
moon rocks being converted to lunar soil by sedimentation
subduction of plates
heat loss from lava
compression of sediments
evaporation of water from the surfaces of leaves
condensation of water on dust particles in the air forming clouds and fog
ice cracking
Subduction
Heat loss
Compression
Evaporation
Condensation
Cracking
Dissolved
Melting
Cut
Enter vapor phase
Lower freezing point
sedimentation

5. Question (hint: look for the words indicating type of change)
In the rock cycle, which of these is a physical change involved with the formation of igneous rocks?
a. Compression of sediments
b. Subduction of plates
c. Heat loss from lava
d. All of the above
Answer: D

6. Question (hint: look for the words indicating type of change)
Sheets of ice containing mostly pure water can be formed by decreasing the temperature of saltwater. Which of these best describes this change?
Chemical change
Nuclear change
Physical change
Atomic change
Answer: C

7. Question (hint: look for the words indicating type of change)
Compounds with the same chemical composition may have different densities because they —
a. have differences in reactivity
b. vary in solubility
c. are able to bond with oxygen
d. exist in different phases
Answer: D; solids most dense, gases least dense (exception: Water – less dense as a solid; that’s why ice floats). This is a very important concept when evaluating aquatic and marine ecosystems. What would happen to aquatic or marine life if ice sank rather than floated?

8. Day 3: Notes Record the following notes under the “Chemical Changes” flap
Identity of material DOES change
Ex: oxygen combines with iron to form iron oxide (rust)
Includes all chemical changes
Words to look for: Souring, rotting, decomposing, burning, changing, forming, producing, acid weathering, rusting, oxidizing
More words to look for:

9. Day 3: Notes - ID the word(s) indicating a chemical change is taking place in each of the following phrases. Record the words under the chemical changes flap after “more words to look for”.
 A silver bracelet tarnishes.
 A bicycle is left out in the rain and begins to rust.
 Leaves on an oak tree turn red as winter approaches .
Starches and sugars being broken down during energy production
 Water and carbon dioxide being converted to glucose 
Iron in rock combining with oxygen to form hematite
Acid rain damaging marble
Tarnishes
Rust
Turn red (color change)
Broken down
Converted
Combining, to form (something new)
Acid rain damaging (hint: if acid is involved, it’s a chemical change)

10. Question (hint: look for the words indicating type of change)
Which of the following is an example of a chemical change?
a. Ice cracking
b. Sugar dissolving
c. Milk souring
d. Lead melting
Answer: C

11. Question (hint: look for the words indicating type of change)
Which of these describes a pollution-producing process that involves a chemical change?
a. Coal with a high sulfur content is burned, producing gases that cause acid rain.
b. Chlorofluorocarbons are released, changing ozone in the upper atmosphere into oxygen.
c. Nitrogen oxide emissions combine with water vapor, producing nitric acid.
d. All of the above

12. Question (hint: look for the words indicating type of change)
Which of these changes in rocks is NOT a chemical change?
a. Acid rain damaging marble
b. Carbonic acid weathering limestone
c. Iron in rock combining with oxygen to form hematite
d. An ice wedge shattering a slab of shale
Answer: D