A sample contains two substances and has uniform properties. The sample is

Options

A. a compound
B. a heterogeneous mixture
C. an element
D. a homogeneous mixture.

Answer

To solve the question, "A sample contains two substances and has uniform properties. The sample is:", we need to analyze the characteristics of different types of matter: compounds, mixtures, and elements.

### Step-by-Step Solution:

1. **Identify the Types of Matter**:
- The main categories of matter include elements, compounds, heterogeneous mixtures, and homogeneous mixtures.

2. **Understanding Compounds**:
- A compound consists of two or more different types of atoms that are chemically bonded together. While it has uniform properties, it does not fit the description of containing "two substances" since it is a single substance.

3. **Understanding Heterogeneous Mixtures**:
- A heterogeneous mixture contains two or more substances that are not uniformly distributed. This means that the properties can vary from one part of the mixture to another. Therefore, this cannot be the correct answer since the sample is described as having uniform properties.

4. **Understanding Elements**:
- An element is a pure substance that cannot be broken down into simpler substances. It consists of only one type of atom. Since the question specifies "two substances," an element cannot be the answer.

5. **Understanding Homogeneous Mixtures**:
- A homogeneous mixture, also known as a solution, consists of two or more substances that are uniformly distributed throughout the mixture. This means that it has uniform properties and composition, which matches the description given in the question.

6. **Conclusion**:
- Since the sample contains two substances and has uniform properties, it must be classified as a homogeneous mixture.

### Final Answer:
The sample is a **homogeneous mixture**.

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