Humber Admissions Practice Test

What is a mixture?

1. A homogeneous structure of one single type

2. A combination of two or more substances that are not chemically combined

3. A mixture that cannot be separated

4. A pure substance with fixed properties

The correct answer is: A combination of two or more substances that are not chemically combined

A mixture is defined as a combination of two or more substances that are not chemically combined, which means that each substance retains its own characteristics and properties within the mix. This distinction is crucial because mixtures can vary in the ratio of their components and can often be separated through physical means, such as filtration or evaporation. In contrast, the other options presented do not accurately reflect the definition of a mixture. The idea of a homogeneous structure of one single type describes a pure substance or solution rather than a mixture. The statement about a mixture that cannot be separated is misleading, as it implies a chemical compound rather than a mixture where components are typically separable. Lastly, a pure substance with fixed properties refers to elements or compounds that consist of one type of particle, contrasting with the diverse nature of mixtures that can include varying amounts and combinations of different substances.