Chemistry homework worksheet on chemical and physical changes.

Problem Analysis:

The homework sheet involves identifying whether certain terms are related to chemical (C) or physical (P) changes, providing examples of physical and chemical changes for specific items, and determining whether statements relate to chemical or physical properties or changes. Below is a detailed solution with explanations.

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Part 1: Tell whether each term would be related to a chemical (C) or physical (P) change.

#### Definitions:
- Physical Change: A change in which the substance's form or appearance changes but its chemical composition remains the same.
- Chemical Change: A change in which the substance's chemical composition changes, forming new substances.

#### Solution:
1. Boil - P (Water changes from liquid to gas, no new substance is formed.)
2. Burn - C (Combustion produces new substances like carbon dioxide and water.)
3. Condense - P (Gas changes to liquid, no new substance is formed.)
4. Corrode - C (Metal reacts with oxygen or other substances to form rust or corrosion products.)
5. Crumple - P (Shape changes, no new substance is formed.)
6. Tarnish - C (Metal reacts with oxygen or sulfur to form tarnish, a new substance.)
7. Color - P (Change in color does not necessarily involve a chemical reaction.)
8. Ferment - C (Microorganisms break down sugars into alcohol or acids, forming new substances.)
9. Melt - P (Solid changes to liquid, no new substance is formed.)
10. Rust - C (Iron reacts with oxygen and water to form iron oxide, a new substance.)
11. Crush - P (Shape changes, no new substance is formed.)
12. Freeze - P (Liquid changes to solid, no new substance is formed.)
13. Frying - C (Heat causes chemical reactions, such as caramelization or Maillard reaction, forming new substances.)
14. Cook - C (Heat causes chemical reactions, breaking down or altering the molecular structure of food.)
15. Oxidize - C (Substance reacts with oxygen to form new compounds.)
16. Grind - P (Size changes, no new substance is formed.)
17. Rot - C (Decomposition involves microbial activity, forming new substances.)
18. Vaporize - P (Liquid changes to gas, no new substance is formed.)
19. Photosynthesis - C (Plants convert carbon dioxide and water into glucose and oxygen, forming new substances.)
20. Paint - P (Coating changes the surface appearance, no new substance is formed.)

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Part 2: Tell how to include each item to make a physical and chemical change.

#### Solution:
| Item | Physical Change | Chemical Change |
|------------|------------------------------------------|-------------------------------------------|
| Potato | Cut it into potato slices | Fry or bake them to make french fries |
| Newspaper | Tear it into pieces | Burn it to produce ash |
| Tree log | Chop it into smaller pieces | Burn it to produce charcoal |
| Vinegar | Pour it into a container | Mix it with baking soda to produce CO₂ |
| Hair | Cut it shorter | Dye it to change its color |
| Skin | Wash it with soap | Sunbathe to cause tanning (melanin production) |

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Part 3: Tell whether each fact is related to chemical (C) or physical (P) properties or changes.

#### Definitions:
- Physical Properties/Changes: Characteristics or changes that do not alter the chemical composition of a substance.
- Chemical Properties/Changes: Characteristics or changes that involve the formation of new substances.

#### Solution:
1. Indicates how a substance reacts to another - C (Chemical property describes reactivity.)
2. Observable using one of the five senses - P (Physical property can be observed directly.)
3. Involves a change in size, shape, or phase - P (Physical change involves changes in state or form.)
4. Molecules of the substance change - C (Chemical change involves rearrangement of molecules.)
5. No new substance is formed - P (Physical change does not produce new substances.)
6. A change in physical and chemical properties - Both (Describes both types of changes.)
7. Molecules of substance do not change - P (Physical change does not alter molecular structure.)
8. A new substance is formed - C (Chemical change produces new substances.)
9. Matter of the substance is not destroyed - P (Conservation of mass in physical changes.)
10. Has flammability and can rust - C (Flammability and rusting are chemical properties.)

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Final Answer:

1. Part 1:
- Boil: P
- Burn: C
- Condense: P
- Corrode: C
- Crumple: P
- Tarnish: C
- Color: P
- Ferment: C
- Melt: P
- Rust: C
- Crush: P
- Freeze: P
- Frying: C
- Cook: C
- Oxidize: C
- Grind: P
- Rot: C
- Vaporize: P
- Photosynthesis: C
- Paint: P

2. Part 2:
| Item | Physical Change | Chemical Change |
|------------|------------------------------------------|-------------------------------------------|
| Potato | Cut it into potato slices | Fry or bake them to make french fries |
| Newspaper | Tear it into pieces | Burn it to produce ash |
| Tree log | Chop it into smaller pieces | Burn it to produce charcoal |
| Vinegar | Pour it into a container | Mix it with baking soda to produce CO₂ |
| Hair | Cut it shorter | Dye it to change its color |
| Skin | Wash it with soap | Sunbathe to cause tanning (melanin production) |

3. Part 3:
- Indicates how a substance reacts to another: C
- Observable using one of the five senses: P
- Involves a change in size, shape, or phase: P
- Molecules of the substance change: C
- No new substance is formed: P
- A change in physical and chemical properties: Both
- Molecules of substance do not change: P
- A new substance is formed: C
- Matter of the substance is not destroyed: P
- Has flammability and can rust: C

Final Answer Boxed:
\boxed{
\text{See detailed solutions above.}
}