Science worksheet for students to determine if given activities involve physical or chemical changes, featuring cartoon illustrations.
Worksheet titled "Physical or Chemical?" with illustrations of children performing various activities, asking students to identify whether each scenario involves a physical or chemical change.
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Step-by-step solution for: Introduction to Physical and Chemical Changes Worksheet | Chemical ...
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Show Answer Key & Explanations
Step-by-step solution for: Introduction to Physical and Chemical Changes Worksheet | Chemical ...
It looks like you've uploaded a worksheet titled "Physical or Chemical?" that asks students to determine whether each listed process is a physical change or a chemical change. Since I can't view images directly, I’ll help you solve the worksheet based on the text you’ve provided.
Here’s the list of processes from your worksheet:
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Determine if each process is a physical change or a chemical change. Write “physical” or “chemical” on the line.
1. Baking chocolate cupcakes
2. Rust forming on an iron nail
3. Breaking a glass bottle
4. Drying a article of clothing
5. Turning a cupcake into a magazine (likely a typo – maybe "into a cake"?)
6. Dissolving sugar in hot water
7. Combining vinegar and baking soda
8. Seeing a board in half
9. Toasting a piece of bread
10. Sharpening a pencil
11. Cooking hot dogs, steaks in the oven
12. Painting a wall blue
13. Frost forming on grass in the morning
14. Squeezing together fabric to make a shirt
15. Heating sugar until it forms into caramel
16. Boiling a pot of water on the stove
17. Digesting a sandwich
18. A door fork that is starting to turn black
19. Dry ice turning into carbon dioxide vapor
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Let’s go through each one with explanations:
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1. Baking chocolate cupcakes → Chemical change
*Explanation:* Baking involves heat causing chemical reactions (like proteins denaturing, starches gelatinizing) that create new substances.
2. Rust forming on an iron nail → Chemical change
*Explanation:* Rust is iron oxide, formed when iron reacts with oxygen and moisture — a new substance is created.
3. Breaking a glass bottle → Physical change
*Explanation:* The glass is still glass; only its shape changes. No new substance is formed.
4. Drying a article of clothing → Physical change
*Explanation:* Water evaporates, but the clothes and water remain chemically unchanged.
5. Turning a cupcake into a magazine → Likely a typo. Possibly meant: “Turning a cupcake into a cake”? But even then, this doesn’t make sense.
→ If it's “baking a cupcake,” it would be chemical change.
*Assuming it's a mistake*, we'll skip or interpret as chemical if referring to baking.
6. Dissolving sugar in hot water → Physical change
*Explanation:* Sugar molecules disperse in water, but no new substances are formed. It can be reversed by evaporation.
7. Combining vinegar and baking soda → Chemical change
*Explanation:* Produces carbon dioxide gas, water, and salt — a new substance is formed (effervescence).
8. Seeing a board in half → Likely a typo: probably “Sawing a board in half”
→ Physical change
*Explanation:* Cutting wood doesn’t change its chemical composition.
9. Toasting a piece of bread → Chemical change
*Explanation:* Maillard reaction occurs, changing color and flavor — new compounds form.
10. Sharpening a pencil → Physical change
*Explanation:* Wood and graphite are just shaped differently; no new substances.
11. Cooking hot dogs, steaks in the oven → Chemical change
*Explanation:* Proteins denature, browning occurs (Maillard reaction), creating new flavors and textures.
12. Painting a wall blue → Physical change
*Explanation:* Paint is applied; no chemical reaction occurs unless it cures (which may involve chemical change). But typically considered physical here.
13. Frost forming on grass in the morning → Physical change
*Explanation:* Water vapor condenses and freezes — phase change, not chemical.
14. Squeezing together fabric to make a shirt → Physical change
*Explanation:* Sewing or shaping fabric doesn’t alter the material chemically.
15. Heating sugar until it forms into caramel → Chemical change
*Explanation:* Caramelization breaks down sugar molecules, creating new compounds with different flavors and colors.
16. Boiling a pot of water on the stove → Physical change
*Explanation:* Water changes from liquid to gas (steam), but remains H₂O.
17. Digesting a sandwich → Chemical change
*Explanation:* Enzymes break down food into simpler molecules (e.g., carbohydrates → sugars), which is a chemical reaction.
18. A door fork that is starting to turn black → Likely means “door hinge” or “iron object” turning black due to oxidation
→ Chemical change
*Explanation:* Oxidation (rusting or tarnishing) creates new compounds.
19. Dry ice turning into carbon dioxide vapor → Physical change
*Explanation:* Sublimation — solid CO₂ turns directly into gas, no chemical change.
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1. Chemical
2. Chemical
3. Physical
4. Physical
5. Chemical *(assuming baking)*
6. Physical
7. Chemical
8. Physical *(assuming sawing)*
9. Chemical
10. Physical
11. Chemical
12. Physical
13. Physical
14. Physical
15. Chemical
16. Physical
17. Chemical
18. Chemical
19. Physical
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Let me know if you’d like this formatted for printing or need a version with corrections for typos!
Here’s the list of processes from your worksheet:
---
Instructions:
Determine if each process is a physical change or a chemical change. Write “physical” or “chemical” on the line.
1. Baking chocolate cupcakes
2. Rust forming on an iron nail
3. Breaking a glass bottle
4. Drying a article of clothing
5. Turning a cupcake into a magazine (likely a typo – maybe "into a cake"?)
6. Dissolving sugar in hot water
7. Combining vinegar and baking soda
8. Seeing a board in half
9. Toasting a piece of bread
10. Sharpening a pencil
11. Cooking hot dogs, steaks in the oven
12. Painting a wall blue
13. Frost forming on grass in the morning
14. Squeezing together fabric to make a shirt
15. Heating sugar until it forms into caramel
16. Boiling a pot of water on the stove
17. Digesting a sandwich
18. A door fork that is starting to turn black
19. Dry ice turning into carbon dioxide vapor
---
Let’s go through each one with explanations:
---
1. Baking chocolate cupcakes → Chemical change
*Explanation:* Baking involves heat causing chemical reactions (like proteins denaturing, starches gelatinizing) that create new substances.
2. Rust forming on an iron nail → Chemical change
*Explanation:* Rust is iron oxide, formed when iron reacts with oxygen and moisture — a new substance is created.
3. Breaking a glass bottle → Physical change
*Explanation:* The glass is still glass; only its shape changes. No new substance is formed.
4. Drying a article of clothing → Physical change
*Explanation:* Water evaporates, but the clothes and water remain chemically unchanged.
5. Turning a cupcake into a magazine → Likely a typo. Possibly meant: “Turning a cupcake into a cake”? But even then, this doesn’t make sense.
→ If it's “baking a cupcake,” it would be chemical change.
*Assuming it's a mistake*, we'll skip or interpret as chemical if referring to baking.
6. Dissolving sugar in hot water → Physical change
*Explanation:* Sugar molecules disperse in water, but no new substances are formed. It can be reversed by evaporation.
7. Combining vinegar and baking soda → Chemical change
*Explanation:* Produces carbon dioxide gas, water, and salt — a new substance is formed (effervescence).
8. Seeing a board in half → Likely a typo: probably “Sawing a board in half”
→ Physical change
*Explanation:* Cutting wood doesn’t change its chemical composition.
9. Toasting a piece of bread → Chemical change
*Explanation:* Maillard reaction occurs, changing color and flavor — new compounds form.
10. Sharpening a pencil → Physical change
*Explanation:* Wood and graphite are just shaped differently; no new substances.
11. Cooking hot dogs, steaks in the oven → Chemical change
*Explanation:* Proteins denature, browning occurs (Maillard reaction), creating new flavors and textures.
12. Painting a wall blue → Physical change
*Explanation:* Paint is applied; no chemical reaction occurs unless it cures (which may involve chemical change). But typically considered physical here.
13. Frost forming on grass in the morning → Physical change
*Explanation:* Water vapor condenses and freezes — phase change, not chemical.
14. Squeezing together fabric to make a shirt → Physical change
*Explanation:* Sewing or shaping fabric doesn’t alter the material chemically.
15. Heating sugar until it forms into caramel → Chemical change
*Explanation:* Caramelization breaks down sugar molecules, creating new compounds with different flavors and colors.
16. Boiling a pot of water on the stove → Physical change
*Explanation:* Water changes from liquid to gas (steam), but remains H₂O.
17. Digesting a sandwich → Chemical change
*Explanation:* Enzymes break down food into simpler molecules (e.g., carbohydrates → sugars), which is a chemical reaction.
18. A door fork that is starting to turn black → Likely means “door hinge” or “iron object” turning black due to oxidation
→ Chemical change
*Explanation:* Oxidation (rusting or tarnishing) creates new compounds.
19. Dry ice turning into carbon dioxide vapor → Physical change
*Explanation:* Sublimation — solid CO₂ turns directly into gas, no chemical change.
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Final Answers:
1. Chemical
2. Chemical
3. Physical
4. Physical
5. Chemical *(assuming baking)*
6. Physical
7. Chemical
8. Physical *(assuming sawing)*
9. Chemical
10. Physical
11. Chemical
12. Physical
13. Physical
14. Physical
15. Chemical
16. Physical
17. Chemical
18. Chemical
19. Physical
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Let me know if you’d like this formatted for printing or need a version with corrections for typos!
Parent Tip: Review the logic above to help your child master the concept of physical or chemical change worksheet.
