Educational worksheet for students to learn and differentiate between physical and chemical properties and changes.

Problem Overview:

The worksheet focuses on distinguishing between physical properties, chemical properties, physical changes, and chemical changes. The task involves defining terms, categorizing properties, and identifying the type of change (physical or chemical) in various scenarios.

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Solution:

#### Part One: Vocabulary Definitions
1. Physical Property: A characteristic of a substance that can be observed or measured without changing its identity.
2. Physical Change: A change in which the identity of the substance does NOT change (e.g., state changes like melting, boiling).
3. Chemical Property: A characteristic of a substance that describes its ability to undergo a chemical change or reaction.
4. Chemical Change: A change in which the identity of the substance DOES change, forming new substances with different properties.

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#### Part Two: Physical or Chemical Property?
We need to classify each term as either a chemical property or a physical property and define it.

##### Chemical Properties:
- Ability to rust: The tendency of a metal to react with oxygen and water to form rust (iron oxide).
- Definition: Reacts with oxygen and water to produce rust.
- Flammability: The ability of a substance to burn in the presence of oxygen.
- Definition: The ability to burn.
- Reactivity with vinegar: The tendency of a substance to react chemically with vinegar (acetic acid).
- Definition: Reacts with vinegar to produce a chemical change.

##### Physical Properties:
- Boiling point: The temperature at which a liquid turns into a gas.
- Definition: The temperature at which a liquid boils.
- Melting point: The temperature at which a solid turns into a liquid.
- Definition: The temperature at which a solid melts.
- Brittleness: The tendency of a material to break or shatter under stress rather than bending.
- Definition: The tendency to break or shatter easily.
- Elasticity: The ability of a material to return to its original shape after being stretched or compressed.
- Definition: The ability to stretch and return to its original shape.
- Density: The mass of a substance per unit volume.
- Definition: The mass of a substance divided by its volume.
- Transparency: The ability of a material to allow light to pass through it.
- Definition: The property of letting light pass through something.
- Ductility: The ability of a material to be stretched into a wire without breaking.
- Definition: The ability to be stretched into a wire.

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#### Part Three: Physical or Chemical Change?
We need to identify whether each scenario represents a physical change ("P") or a chemical change ("C").

1. Glass breaking: P (Physical change; no new substance is formed; only the shape changes.)
2. Hammering wood together: P (Physical change; the wood is reshaped but not chemically altered.)
3. A rusting bicycle: C (Chemical change; iron reacts with oxygen and water to form rust, a new substance.)
4. Melting butter: P (Physical change; the state changes from solid to liquid, but the substance remains butter.)
5. Separate sand from gravel: P (Physical change; no chemical reaction occurs; only separation based on size.)
6. Bleaching your hair: C (Chemical change; chemicals react with hair proteins to alter their color.)
7. Frying an egg: C (Chemical change; heat causes proteins in the egg to denature and form new structures.)
8. Squeeze oranges for juice: P (Physical change; the juice is extracted, but no new substance is formed.)
9. Melting ice: P (Physical change; ice changes from solid to liquid, but the substance remains water.)
10. Mixing salt and water: P (Physical change; salt dissolves in water, but no new substance is formed.)
11. Mixing oil and water: P (Physical change; oil and water do not react chemically; they remain separate phases.)
12. Water evaporating: P (Physical change; water changes from liquid to gas, but the substance remains water.)
13. Cutting grass: P (Physical change; the grass is cut into smaller pieces, but no chemical reaction occurs.)
14. Burning leaves: C (Chemical change; leaves react with oxygen to form carbon dioxide, water, and ash.)
15. Fireworks exploding: C (Chemical change; chemicals react explosively to produce light, heat, and new substances.)
16. Cutting your hair: P (Physical change; the hair is cut shorter, but no chemical reaction occurs.)
17. Crushing a can: P (Physical change; the can is deformed, but no new substance is formed.)
18. Boiling water: P (Physical change; water changes from liquid to gas, but the substance remains water.)

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Final Answer:

#### Vocabulary Definitions:
- Physical Property: A characteristic of a substance that can be observed or measured without changing its identity.
- Physical Change: A change in which the identity of the substance does NOT change.
- Chemical Property: A characteristic of a substance that describes its ability to undergo a chemical change or reaction.
- Chemical Change: A change in which the identity of the substance DOES change, forming new substances with different properties.

#### Chemical Properties:
1. Ability to rust: Reacts with oxygen and water to produce rust.
2. Flammability: The ability to burn.
3. Reactivity with vinegar: Reacts with vinegar to produce a chemical change.

#### Physical Properties:
1. Boiling point: The temperature at which a liquid boils.
2. Melting point: The temperature at which a solid melts.
3. Brittleness: The tendency to break or shatter easily.
4. Elasticity: The ability to stretch and return to its original shape.
5. Density: The mass of a substance divided by its volume.
6. Transparency: The property of letting light pass through something.
7. Ductility: The ability to be stretched into a wire.

#### Physical or Chemical Change?
1. Glass breaking: P
2. Hammering wood together: P
3. A rusting bicycle: C
4. Melting butter: P
5. Separate sand from gravel: P
6. Bleaching your hair: C
7. Frying an egg: C
8. Squeeze oranges for juice: P
9. Melting ice: P
10. Mixing salt and water: P
11. Mixing oil and water: P
12. Water evaporating: P
13. Cutting grass: P
14. Burning leaves: C
15. Fireworks exploding: C
16. Cutting your hair: P
17. Crushing a can: P
18. Boiling water: P

Final Answer Boxed:
\boxed{
\begin{array}{ll}
\text{Chemical Properties:} & \text{1. Ability to rust, 2. Flammability, 3. Reactivity with vinegar} \\
\text{Physical Properties:} & \text{1. Boiling point, 2. Melting point, 3. Brittleness, 4. Elasticity, 5. Density, 6. Transparency, 7. Ductility} \\
\text{Physical Changes:} & \text{1, 2, 4, 5, 8, 9, 10, 11, 12, 13, 16, 17, 18} \\
\text{Chemical Changes:} & \text{3, 6, 7, 14, 15}
\end{array}
}