sugar is a kind of pure substance & water is a kind of substance & lemon juice is a kind of substance ->  water, lemon juice, sugar are three substances  water, lemon juice, sugar are three substances & lemonade is made of water, lemon juice, and sugar ->  lemonade is made of at least three substances  lemonade is made of at least three substances & an mixture is formed by two or more substances combined together physically -> lemonade is a kind of mixture