Physical and Chemical Changes Craftivity - The Owl Teacher - Free Printable

This is a worksheet designed to help students distinguish between physical and chemical changes. The task is to color the examples of physical changes in red and the examples of chemical changes in blue.

To solve this, I need to analyze each illustration in the grid and determine whether it represents a physical change (no new substance is formed, often reversible) or a chemical change (a new substance is formed, often irreversible).

I will go through the grid systematically, row by row, to identify each example.

First Row

- Cell 1: Text says "no new substance is formed". This is the definition of a physical change.
- Cell 2: Scissors cutting paper. This is a physical change; the paper's shape changes, but it's still paper.
- Cell 3: A toaster making toast. Toasting bread is a chemical change; the heat causes a chemical reaction that browns the bread and changes its flavor and texture.
- Cell 4: A glass with dissolving tablets (like Alka-Seltzer). When the tablet dissolves and fizzes, it's undergoing a chemical reaction with water, producing gas (carbon dioxide). This is a chemical change.
- Cell 5: A glue stick being used. Applying glue is generally a physical change as the glue just changes state from solid to liquid and then back to solid, without forming a new substance.

Second Row

- Cell 1: Hands bending a wire hanger. This is a physical change; only the shape is altered.
- Cell 2: Ice cubes melting in a glass. Melting is a physical change; solid water becomes liquid water, but it's still H2O.
- Cell 3: Text says "only a shape change". This is a physical change.
- Cell 4: Eggs frying in a pan. Cooking eggs is a chemical change; the heat denatures the proteins, changing their structure permanently.
- Cell 5: A match being lit. Lighting a match involves combustion, a chemical reaction that produces fire, light, and new substances like ash and smoke. This is a chemical change.

Third Row

- Cell 1: Mixing ingredients in a bowl (e.g., baking). Mixing ingredients for baking can involve both physical and chemical changes, but the act of mixing itself is primarily physical. However, if it leads to baking, it's chemical. In this context, it might be ambiguous, but since it's just mixing, we'll consider it physical.
- Cell 2: A campfire. Burning wood is a classic example of a chemical change; it produces heat, light, and new substances like ash and smoke.
- Cell 3: Slicing bread. This is a physical change; the bread is cut into pieces, but it's still bread.
- Cell 4: Text says "can be reversed". This describes a physical change (e.g., melting ice can be frozen again).
- Cell 5: Breaking a plate. This is a physical change; the plate is shattered, but the material is unchanged.

Fourth Row

- Cell 1: Text says "a solid is formed". This could be a physical change (e.g., freezing water) or a chemical change (e.g., precipitation in a reaction). We need to look at the image.
- Cell 2: A kettle boiling water. Boiling is a physical change; liquid water turns to steam (gas), but it's still water.
- Cell 3: A block of butter melting. Melting is a physical change; solid butter becomes liquid butter.
- Cell 4: A rocket launching. Rocket propulsion involves chemical reactions (combustion of fuel), so this is a chemical change.
- Cell 5: Text says "can't be reversed". This describes a chemical change (e.g., burning paper cannot be undone).

Fifth Row

- Cell 1: Adding sugar to water. Dissolving sugar in water is a physical change; the sugar molecules are dispersed in water but can be recovered by evaporation.
- Cell 2: Text says "a new substance is formed". This is the definition of a chemical change.
- Cell 3: A banana ripening. Ripening involves chemical changes as enzymes break down starches into sugars and other compounds, changing the fruit's color, texture, and taste.
- Cell 4: Fireworks exploding. Fireworks involve rapid chemical reactions that produce light, sound, and new substances, so this is a chemical change.
- Cell 5: A flask with bubbling liquid. Bubbling often indicates a gas is being produced, which is a sign of a chemical reaction (e.g., vinegar and baking soda). This is likely a chemical change.

Now, let's summarize the correct coloring:

Physical Changes (Color Red):
- Scissors cutting paper
- Hands bending a wire hanger
- Ice cubes melting
- Slicing bread
- Breaking a plate
- Kettle boiling water
- Butter melting
- Adding sugar to water
- Glue stick application (assuming no chemical reaction)
- The text cells: "no new substance is formed", "only a shape change", "can be reversed", "a solid is formed" (if interpreted as freezing)

Chemical Changes (Color Blue):
- Toaster making toast
- Dissolving tablet fizzing
- Frying eggs
- Lighting a match
- Campfire
- Rocket launch
- Banana ripening
- Fireworks
- Flask with bubbling liquid
- The text cells: "a new substance is formed", "can't be reversed"

Note: Some cells have text that defines the type of change, so those should be colored according to their definition.

Final Answer:
To complete the worksheet, color the following items red (physical changes):
- Scissors cutting paper
- Hands bending a wire hanger
- Ice cubes melting
- Slicing bread
- Breaking a plate
- Kettle boiling water
- Butter melting
- Adding sugar to water
- Glue stick application
- Text: "no new substance is formed"
- Text: "only a shape change"
- Text: "can be reversed"
- Text: "a solid is formed" (assuming it refers to freezing)

Color the following items blue (chemical changes):
- Toaster making toast
- Dissolving tablet fizzing
- Frying eggs
- Lighting a match
- Campfire
- Rocket launch
- Banana ripening
- Fireworks
- Flask with bubbling liquid
- Text: "a new substance is formed"
- Text: "can't be reversed"

This completes the task.