Final answer:
The statement is true, as a mixture consists of two or more substances that are not chemically combined and can be separated by physical methods. Examples include cereal in milk and air, with mixtures being heterogeneous or homogeneous based on whether the substances are visibly distinguishable.
Step-by-step explanation:
True, a mixture is indeed made of two or more elements, compounds, or both, that are together in the same place but are not chemically combined. This means that no chemical bonds or reactions occur between the substances within the mixture. In mixtures, the proportion of the individual substances can vary, and they can also retain their original properties. Mixtures can be either heterogeneous, where the different components can be visually distinguished, or homogeneous, where the composition is uniform throughout.
An example of a mixture is cereal in milk; the cereal does not chemically react with the milk, they can be easily separated by physical means, and the ratio of cereal to milk can differ. Another example is air, which is a homogeneous mixture of different gases, such as nitrogen, oxygen, and carbon dioxide, among others.
Furthermore, a key characteristic of mixtures is their ability to be separated into their individual components through physical methods. For instance, sand can be added to water in any proportion, and it will still remain a mixture, as no fixed ratio is required for its definition, and the sand can be separated from the water by simply filtering it.