What distinguishes a substance from a mixture? Mixtures can be separated physically, while compounds cannot. Samples of the same substance can have different intensive properties. Substances are compounds, and mixtures are not. Mixtures are groupings of elements, and compounds are not.

Answer Mixtures are physically combined structures that can be separated into their original components. A chemical substance is composed of one type of atom or molecule. A mixture is composed of different types of atoms or molecules that are not chemically bonded.

the major pests we deal with are insects, weeds and fungal diseases. a pesticide is a product, whether organic or chemical, used to kill the target pest. there are other techniques gardeners should use that can prevent the severe infestations that make the use of pesticides necessary