Task Overview:
The task requires identifying and coloring examples of
physical changes in red and
chemical changes in blue. Physical changes involve alterations in the form or appearance of a substance without changing its chemical composition, while chemical changes result in the formation of new substances with different properties.
Solution Approach:
1.
Understand the Definitions:
-
Physical Change: No new substance is formed; only the state, shape, or form of the substance changes.
-
Chemical Change: A new substance is formed, often accompanied by energy changes (e.g., heat, light).
2.
Analyze Each Image:
- Carefully examine each image to determine whether it represents a physical change or a chemical change based on the definitions above.
3.
Coloring Guide:
-
Red: Physical changes.
-
Blue: Chemical changes.
Step-by-Step Analysis of Each Image:
####
Row 1: "No new substance is formed"
1. Scissors cutting paper:
Physical change (shape change, no new substance).
2. Boiling water:
Physical change (change in state from liquid to gas, no new substance).
3. Bubbles in a glass:
Physical change (gas bubbles forming, no new substance).
4. Painting a shirt:
Physical change (color change, no new substance).
####
Row 2: "Only a shape change"
1. Bent hose:
Physical change (shape change, no new substance).
2. Ice cubes in water:
Physical change (state change, no new substance).
3. Magnifying glass:
Physical change (no chemical reaction, no new substance).
4. Burning match:
Chemical change (new substances like carbon dioxide and ash are formed).
####
Row 3: "Can be reversed"
1. Mixing ingredients in a bowl:
Physical change (can be separated, no new substance).
2. Fire burning:
Chemical change (cannot be reversed, new substances formed).
3. Slicing bread:
Physical change (shape change, can be reassembled).
4. Crumpled paper:
Physical change (shape change, can be flattened).
####
Row 4: "A solid is formed"
1. Kettle boiling:
Physical change (water vapor forms, but no new substance).
2. Ice cube melting:
Physical change (state change, no new substance).
3. Rocket launching:
Chemical change (fuel burns, new substances like gases are formed).
4. Broken glass:
Physical change (shape change, no new substance).
####
Row 5: "A new substance is formed"
1. Sugar dissolving in water:
Physical change (sugar disperses, no new substance).
2. Butterfly emerging:
Chemical change (metamorphosis involves complex biochemical processes).
3. Fireworks exploding:
Chemical change (explosion produces new substances and light).
4. Sand timer:
Physical change (sand falls, no new substance).
Final Coloring Guide:
-
Red (Physical Changes):
- Row 1: All images.
- Row 2: First three images.
- Row 3: First, third, and fourth images.
- Row 4: First two images.
- Row 5: First image.
-
Blue (Chemical Changes):
- Row 2: Fourth image.
- Row 3: Second image.
- Row 4: Third image.
- Row 5: Second and third images.
Final Answer:
\[
\boxed{
\text{Red: All images except Row 2 (4th), Row 3 (2nd), Row 4 (3rd), Row 5 (2nd and 3rd).}
}
\]
\[
\boxed{
\text{Blue: Row 2 (4th), Row 3 (2nd), Row 4 (3rd), Row 5 (2nd and 3rd).}
}
\]
Parent Tip: Review the logic above to help your child master the concept of chemical and physical changes worksheet with answers.
