Physical and Chemical Changes online worksheet for 8 - Free Printable

Problem Overview:

The task is to classify the given terms into four categories:
1. Physical Properties
2. Chemical Properties
3. Physical Changes
4. Chemical Changes

We will use the definitions provided in the review section to categorize each term correctly.

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Definitions Recap:

- Physical Property: Describes something about a substance that can be observed or measured without changing its identity (e.g., color, density, melting point).
- Chemical Property: Describes how a substance will react with other substances to form new substances (e.g., flammability, reactivity).
- Physical Change: A change in the physical state or form of a substance without altering its chemical identity (e.g., melting, freezing, cutting).
- Chemical Change: A change in which a new substance is formed through a chemical reaction (e.g., rusting, souring, decomposing).

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Solution:

#### Step 1: Classify Physical Properties
These are characteristics that describe the substance itself and can be observed or measured without changing it.

- 1. Flammable: Chemical Property (describes how the substance reacts with fire).
- 2. Mixing: Physical Change (no new substance is formed; just a combination of substances).
- 3. Tarnishing: Chemical Change (formation of a new substance on the surface due to oxidation).
- 4. Combustible: Chemical Property (describes how the substance reacts when burned).
- 5. 88 degrees: Physical Property (temperature is a measurable property).
- 6. Bread molding: Chemical Change (involves decomposition by microorganisms, forming new substances).
- 7. Molding clay: Physical Change (changing the shape of the clay without forming a new substance).
- 8. Melting: Physical Change (change in state from solid to liquid).
- 9. Density: Physical Property (a measurable characteristic of a substance).
- 10. Rotting: Chemical Change (decomposition process involving new substances).
- 11. Rusting: Chemical Change (formation of iron oxide, a new substance).
- 12. Freezing: Physical Change (change in state from liquid to solid).
- 13. Cutting: Physical Change (altering the shape or size of a substance without forming a new one).

#### Step 2: Classify Chemical Properties
These describe how a substance will react chemically with other substances.

- 1. Flammable: Chemical Property.
- 4. Combustible: Chemical Property.

#### Step 3: Classify Physical Changes
These involve changes in the physical state or form of a substance without altering its chemical identity.

- 2. Mixing: Physical Change.
- 7. Molding clay: Physical Change.
- 8. Melting: Physical Change.
- 12. Freezing: Physical Change.
- 13. Cutting: Physical Change.

#### Step 4: Classify Chemical Changes
These involve the formation of new substances through chemical reactions.

- 3. Tarnishing: Chemical Change.
- 6. Bread molding: Chemical Change.
- 10. Rotting: Chemical Change.
- 11. Rusting: Chemical Change.

#### Step 5: Classify Additional Terms
Now, we classify the remaining terms under the appropriate categories:

- 14. Sour tasting: Chemical Property (describes a reaction that produces an acidic taste).
- 15. Milk souring: Chemical Change (formation of lactic acid, a new substance).
- 16. Decomposing: Chemical Change (breakdown of a substance into simpler components).
- 17. Solid phase: Physical Property (state of matter is a physical characteristic).
- 18. Reacting: Chemical Property (describes the ability to undergo a chemical reaction).
- 19. 456 grams: Physical Property (mass is a measurable characteristic).
- 20. Fragile: Physical Property (describes the strength or durability of a substance).
- 21. Bitter: Chemical Property (describes a reaction that produces a bitter taste).
- 22. Purple: Physical Property (color is a measurable characteristic).
- 23. Bleaching: Chemical Change (removal of color through a chemical reaction).
- 24. Evaporating: Physical Change (change in state from liquid to gas).
- 25. 432 ml: Physical Property (volume is a measurable characteristic).

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Final Classification:

#### Physical Properties
- 5. 88 degrees
- 9. Density
- 17. Solid phase
- 19. 456 grams
- 20. Fragile
- 22. Purple
- 25. 432 ml

#### Chemical Properties
- 1. Flammable
- 4. Combustible
- 14. Sour tasting
- 18. Reacting
- 21. Bitter

#### Physical Changes
- 2. Mixing
- 7. Molding clay
- 8. Melting
- 12. Freezing
- 13. Cutting
- 24. Evaporating

#### Chemical Changes
- 3. Tarnishing
- 6. Bread molding
- 10. Rotting
- 11. Rusting
- 15. Milk souring
- 16. Decomposing
- 23. Bleaching

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Final Answer:

\[
\boxed{
\begin{array}{ll}
\textbf{Physical Properties:} & 5, 9, 17, 19, 20, 22, 25 \\
\textbf{Chemical Properties:} & 1, 4, 14, 18, 21 \\
\textbf{Physical Changes:} & 2, 7, 8, 12, 13, 24 \\
\textbf{Chemical Changes:} & 3, 6, 10, 11, 15, 16, 23 \\
\end{array}
}
\]