I've just recently started relearning chemistry. Forgive me for asking such a basic question, but my textbook doesn't use very practical examples with a detailed explanation. So a hetero and homo mixture can be classified as if there compositions (multiple substances) are blended or not. Let's say a trail mix is hetero mixture because all of the little chips and crackers do not blend (or form?) together. An example of a homo mixture is sugar and water (sugar dissolved in water) because they blended together. Another small side question: Is it always possible to tell whether specific matter is homo or hetero just by looking at it, or do you need to know the compositions of the matter?