Worksheet for students to learn and practice identifying chemical and physical properties of substances.

Problem Overview:

The task involves classifying properties as either physical or chemical. Physical properties are characteristics that can be observed or measured without changing the identity of the substance, while chemical properties describe how a substance reacts with other substances to form new substances.

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Solution:

#### Part A: Classify the Properties
We will classify each property as either a Physical Property or a Chemical Property by understanding its nature.

1. Boiling point
- Physical Property: The boiling point is a measurable characteristic of a substance that does not involve a chemical change.

2. Reacts with a base to form water
- Chemical Property: This describes a chemical reaction where a substance reacts with a base to produce water, indicating a chemical change.

3. Malleability
- Physical Property: Malleability refers to the ability of a substance to be hammered into thin sheets, which is a physical characteristic.

4. Can neutralize a base
- Chemical Property: Neutralization is a chemical reaction where an acid and a base react to form water and a salt, indicating a chemical change.

5. Length of an object
- Physical Property: The length of an object is a measurable physical dimension.

6. Conductivity
- Physical Property: Conductivity refers to the ability of a substance to conduct heat or electricity, which is a physical characteristic.

7. Gives off toxic gases
- Chemical Property: Emitting toxic gases involves a chemical reaction or decomposition, indicating a chemical property.

8. Coordination number
- Physical Property: Coordination number is a structural property related to the arrangement of atoms or ions around a central atom, which is a physical characteristic.

9. Ignites immediately
- Chemical Property: Ignition involves a chemical reaction (combustion), indicating a chemical property.

10. Smelly substance
- Physical Property: Smell is a sensory property that can be detected without altering the substance's identity, making it a physical property.

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#### Part B: State Whether Each Is a Physical or Chemical Property
We will analyze each statement to determine if it describes a physical or chemical property.

1. The sulfur is yellow
- Physical Property: Color is a physical characteristic that can be observed without changing the substance.

2. Iron reacts with sulfur to give heat and flame
- Chemical Property: This describes a chemical reaction (formation of iron sulfide) accompanied by heat and light, indicating a chemical property.

3. Baking soda with acid produces bubbles of gases
- Chemical Property: The production of gas bubbles indicates a chemical reaction between baking soda and acid.

4. Metal can be rolled into flat sheets
- Physical Property: Rolling metal into sheets is a physical deformation, not a chemical change.

5. Oxygen is colorless, odorless, and tasteless
- Physical Property: These are observable physical characteristics of oxygen.

6. Copper turns green when exposed to the environment
- Chemical Property: The green patina on copper is due to a chemical reaction with oxygen and moisture in the environment.

7. A piece of metal is magnetic
- Physical Property: Magnetism is a physical property of certain metals.

8. Sodium hydroxide dissolves in water
- Physical Property: Dissolving is a physical process where the solute disperses in the solvent without forming new substances.

9. A pellet of sodium is sliced into two
- Physical Property: Slicing is a physical change that does not alter the chemical identity of the substance.

10. Water is heated and changes into steam
- Physical Property: Heating water to form steam is a phase change (from liquid to gas), which is a physical process.

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Final Answer:

#### Part A: Classification
| Property | Physical Property | Chemical Property |
|--------------------------------|-------------------|--------------------|
| Boiling point | ✓ | |
| Reacts with a base to form water | | ✓ |
| Malleability | ✓ | |
| Can neutralize a base | | ✓ |
| Length of an object | ✓ | |
| Conductivity | ✓ | |
| Gives off toxic gases | | ✓ |
| Coordination number | ✓ | |
| Ignites immediately | | ✓ |
| Smelly substance | ✓ | |

#### Part B: Physical or Chemical Property
1. The sulfur is yellow: Physical Property
2. Iron reacts with sulfur to give heat and flame: Chemical Property
3. Baking soda with acid produces bubbles of gases: Chemical Property
4. Metal can be rolled into flat sheets: Physical Property
5. Oxygen is colorless, odorless, and tasteless: Physical Property
6. Copper turns green when exposed to the environment: Chemical Property
7. A piece of metal is magnetic: Physical Property
8. Sodium hydroxide dissolves in water: Physical Property
9. A pellet of sodium is sliced into two: Physical Property
10. Water is heated and changes into steam: Physical Property

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Final Answer Box:
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\text{See detailed explanations above.}
}