Determine whether the following statement is true or false. If a substance seems to be uniform throughout then it must be pure.

Analyzing the Statement

1. Understanding the Concepts:

   • A "pure substance" is a material that possesses a constant composition and consistent properties throughout. This could be a single element or a compound.
   • A "homogeneous mixture" appears uniform throughout but consists of two or more substances that retain their individual properties.

2. Evaluating the Statement:

   • The statement suggests that if a substance looks uniform (i.e., homogeneous), then it must be a pure substance. However, this ignores the possibility of mixtures.

3. Examples:

   • Consider a solution like saltwater: it appears uniform (homogeneous) but is actually a mixture of salt and water. Thus, it is not considered a pure substance.
   • Conversely, pure water is a homogeneous substance, but not all homogeneous substances are pure.

Conclusion

The statement is False. A substance can appear uniform throughout yet still be a mixture of two or more components. Therefore, visual uniformity does not guarantee purity.