Worksheet titled "Physical and Chemical Properties Worksheet" designed for educational use, featuring sections to identify physical (P) or chemical (C) properties, classify descriptions as physical or chemical with property types, and determine if properties are intensive or extensive.

Here is the complete solution to the Physical and Chemical Properties Worksheet, with clear explanations for each part.

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## ✔ A. Identify the following as physical (P) or chemical (C) properties

| Property | Type |
|---------------------------|------|
| blue color | P |
| density | P |
| flammability (burns) | C |
| solubility (dissolves) | P |
| reacts with acid | C |
| supports combustion | C |
| sour taste | P |
| melting point | P |
| reacts with water | C |
| hardness | P |
| boiling point | P |
| shine | P |
| odor | P |
| reacts with air | C |
| sublimates | P |

🔍 Explanation:

- Physical properties (P) can be observed or measured without changing the substance’s chemical identity. Examples: color, density, melting point, odor, solubility, hardness, shine, sublimation.
- Chemical properties (C) describe how a substance reacts or changes into new substances. Examples: flammability, reactivity with acid/water/air, supporting combustion.

> 📝 *Note: “Sublimates” is a physical change — solid → gas without becoming liquid — so it’s physical.*

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## ✔ B. State whether each is physical or chemical property and the type of property

| Description | Physical/Chemical | Type of Property |
|-----------------------------------------------------------|-------------------|-------------------------------|
| 1. Copper nitrate is a blue crystal | Physical | Color / Appearance |
| 2. Two colorless solutions mix to give a yellow solid precipitate | Chemical | Reactivity / Formation of precipitate |
| 3. Copper can be stretched into a thin wire | Physical | Malleability / Ductility |
| 4. Copper metal reacts with nitric acid to make a brown gas | Chemical | Reactivity / Gas production |
| 5. Salt, sodium chloride, is a white crystal that melts at 801 °C | Physical | Color & Melting Point |

🔍 Explanation:

- #1: Describes appearance (color and state) → Physical → *Color*.
- #2: Mixing solutions forms a new solid (precipitate) → chemical reaction → Chemical → *Reactivity / Precipitation*.
- #3: Stretching metal without changing composition → Physical → *Ductility* (a mechanical property).
- #4: Reaction produces a new substance (brown gas = nitrogen dioxide) → Chemical → *Reactivity with acid*.
- #5: Describes color and melting point → both measurable without changing identity → Physical → *Appearance & Thermal property*.

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## ✔ C. Write whether the following physical properties are intensive or extensive

| Property | Intensive or Extensive? |
|--------------|--------------------------|
| Temperature | Intensive |
| Area | Extensive |
| Ductility | Intensive |
| Height | Extensive |
| Solubility | Intensive |

🔍 Explanation:

- Intensive properties do not depend on the amount of matter. They are inherent to the material.
- *Examples:* Temperature, color, density, ductility, solubility, melting point.
- Extensive properties do depend on the amount of matter.
- *Examples:* Mass, volume, area, height, weight, length.

> 📌 *Solubility* is intensive — e.g., salt dissolves in water at ~36 g/100 mL regardless of how much salt you have.
> 📌 *Area* and *height* are extensive — they increase with more material.

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## ✔ Final Answer Summary:

A:

```
blue color: P density: P flammability: C
solubility: P reacts with acid: C supports combustion: C
sour taste: P melting point: P reacts with water: C
hardness: P boiling point: P shine: P
odor: P reacts with air: C sublimates: P
```

B:

```
1. Physical — Color
2. Chemical — Precipitation / Reactivity
3. Physical — Ductility
4. Chemical — Reactivity / Gas formation
5. Physical — Color & Melting Point
```

C:

```
Temperature: Intensive
Area: Extensive
Ductility: Intensive
Height: Extensive
Solubility: Intensive
```

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✔ You’re all set! This worksheet covers key distinctions between physical/chemical properties and intensive/extensive properties — foundational concepts in chemistry. Let me know if you’d like flashcards or diagrams to reinforce this!