Free Printable Physical and Chemical Properties and Changes Worksheets - Free Printable

Problem Explanation:

The task involves understanding the differences between physical properties and chemical properties of substances and then classifying a list of properties as either physical (PP) or chemical (CP).

#### Step 1: Understanding Physical and Chemical Properties
- Physical Properties: These are characteristics of a substance that can be observed or measured without changing its chemical identity. Examples include color, density, melting point, boiling point, etc.
- Chemical Properties: These describe how a substance reacts or behaves chemically when it undergoes a chemical change. Examples include reactivity with other substances, flammability, and solubility.

#### Step 2: Classifying the Given Properties
We will analyze each property to determine whether it is a physical property (PP) or a chemical property (CP).

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Solution:

#### 1. Differences Between Physical and Chemical Properties:
- Physical Properties:
- Can be observed or measured without altering the substance's chemical composition.
- Examples: Color, density, melting point, boiling point, hardness, luster, odor, solubility.

- Chemical Properties:
- Describe how a substance reacts chemically with other substances.
- Examples: Reactivity with acids, bases, water, air; flammability; ability to support combustion.

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#### 2. Identifying Each Property as PP or CP:

- a. blue color: This is a physical property because it describes the appearance of the substance without changing its chemical identity.
- Answer: PP

- b. boiling point: This is a physical property because it describes the temperature at which a substance changes from liquid to gas without undergoing a chemical change.
- Answer: PP

- c. density: This is a physical property because it describes the mass per unit volume of a substance, which can be measured without altering its chemical composition.
- Answer: PP

- d. flammability (burns): This is a chemical property because it describes the ability of a substance to undergo combustion, which is a chemical reaction.
- Answer: CP

- e. hardness: This is a physical property because it describes the resistance of a substance to being scratched or deformed, which does not involve a chemical change.
- Answer: PP

- f. luster: This is a physical property because it describes the way a substance reflects light, which is an observable characteristic without chemical alteration.
- Answer: PP

- g. melting point: This is a physical property because it describes the temperature at which a substance changes from solid to liquid, which is a physical change.
- Answer: PP

- h. odor: This is a physical property because it describes the smell of a substance, which can be detected without altering its chemical identity.
- Answer: PP

- i. reacts with acid: This is a chemical property because it describes the ability of a substance to undergo a chemical reaction with an acid.
- Answer: CP

- j. reacts with air: This is a chemical property because it describes the ability of a substance to undergo a chemical reaction with components of air (e.g., oxygen).
- Answer: CP

- k. reacts with water: This is a chemical property because it describes the ability of a substance to undergo a chemical reaction with water.
- Answer: CP

- l. solubility (dissolves): This is a physical property because it describes the ability of a substance to dissolve in a solvent, which is a physical process (not a chemical reaction unless specified otherwise).
- Answer: PP

- m. sour taste: This is a physical property because it describes the sensory experience of taste, which does not involve a chemical change.
- Answer: PP

- n. supports combustion: This is a chemical property because it describes the ability of a substance to assist in the burning process, which involves chemical reactions.
- Answer: CP

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Final Answer:

```
a. blue color - PP
b. boiling point - PP
c. density - PP
d. flammability (burns)- CP
e. hardness - PP
f. luster - PP
g. melting point - PP
h. odor - PP
i. reacts with acid - CP
j. reacts with air - CP
k. reacts with water - CP
l. solubility (dissolves) - PP
m. sour taste - PP
n. supports combustion - CP
```

Boxed Final Answer:
\[
\boxed{
\begin{array}{ll}
\text{a. blue color} & \text{PP} \\
\text{b. boiling point} & \text{PP} \\
\text{c. density} & \text{PP} \\
\text{d. flammability (burns)} & \text{CP} \\
\text{e. hardness} & \text{PP} \\
\text{f. luster} & \text{PP} \\
\text{g. melting point} & \text{PP} \\
\text{h. odor} & \text{PP} \\
\text{i. reacts with acid} & \text{CP} \\
\text{j. reacts with air} & \text{CP} \\
\text{k. reacts with water} & \text{CP} \\
\text{l. solubility (dissolves)} & \text{PP} \\
\text{m. sour taste} & \text{PP} \\
\text{n. supports combustion} & \text{CP} \\
\end{array}
}
\]