1. Physical vs. Chemical Changes 5th Grade Science

2. What do you think? a rusting bicycle separating gravel from sand
Chemical
Physical
a rusting bicycle
separating gravel from sand
squeezing oranges to make orange juice
melting ice cream
pouring milk over cereal
an apple core turning brown

3. Balloon Observe your balloon. What can you do to change your balloon?
Blow up your balloon, if you haven’t done so already, and tie it off.
Once it is blown up, what can be done to change it again?

4. Mystery Bag
Observe powder in the plastic bag and the liquid in the cup.
Take the cup with liquid in it and put it in the zipper sandwich bag (that contains the powder) WITHOUT dumping it.
Seal the zipper bag tightly.
Make a prediction: What do you think will happen when the two substances mix?

5. Mystery Bag
Keeping the zipper part of your bag at the top, dump the cup of liquid into the sealed bag.
How does it feel? What changes are taking place? How have the contents of your bag changed?

6. Physical or Chemical Change?
Based on your observations, predict which one is a physical change and which one is a chemical change. TELL YOUR SHOULDER PARTNER YOUR PREDICTION.

7. Physical Changes
When a physical change occurs, matter keeps its identity.
Includes: changes in position, size, shape, volume, and phase of matter.

8. Physical Changes Example: falling raindrops can freeze to form sleet.
Raindrops and sleet differ in size, shape, volume, and phase of matter, they are both still the same essential substance: water.
Can you think of another example?

9. Chemical Changes
A chemical change occurs when one substance or kind of matter changes into another completely different kind of matter with different properties.

10. Chemical Changes
Example: A ship’s wheel is made of the element iron. After years of being in the ocean’s water, the iron on the wheel’s surface changed into a new material called iron oxide.
Can you think of another example?
When a chemical change occurs, atoms rearrange themselves to form different kinds of matter.

11. Evidence of Chemical Changes
Change in Color
Formation of Gas or Solid
Fizzing/Bubbles
Crystal Formation
Temperature Change
Change in Odor
Change of Energy

12. Changes in Energy
The formation and breaking of chemical bonds always involves the materials taking in or giving off energy.
For example, a log burning in a fireplace is undergoing the chemical process of COMBUSTION. During combustion, the burning log gives off energy. We detect the energy as the heat and light of the fire.

13. Physical vs. Chemical Changes Post-Test
Chemical
Physical
a rusting bicycle
separating gravel from sand
squeezing oranges to make orange juice
melting ice cream
pouring milk over cereal
an apple core turning brown

14. Law of Conservation of Mass

15. Classwork
Changes in Matter Post-Assessment (stack at aisle edge when complete)
Add “Evidence of Chemical and Physical Changes” insert onto page 25 of Science Notebook.
Read Chapter 12 Lesson 1
Do 120 A – PROVE IT! (turn into tray when complete)
Get a Chromebook and play the “Alien Juice Bar” Game from the “Websites” Tab.