2.3: What are pure substances and how are they classified? Both devices use properties to separate mixtures of matter into
A.A dip net is a traditional Aboriginal tool designed to separate big fish from smaller fish or water. B.A device used to analyze & identify the types of matter in a sample from a crime scene. Both devices use properties to separate mixtures of matter into their parts! Pure substances are elements & compounds
Matter is usually classified by its physical & chemical properties. Early scientists grouped matter on how they could break it apart. Matter that could be seperated into parts using differences in physical properties was classified as a mixture. Matter that is not a mixture is a pure substance. Classifying Matter Pure Substances Pure Substance matter that contains only one type of particle, so it cannot be sepeated into parts physically. Examples:table sugar (sucrose), oxygen, pure water, copper, aluminum. Each part of a pure substance has the same properties however, the kinds of particles of one pure substance is different from the particles of other pure substances. Pure Substances Compounds & Elements There are two types of pure substances
Compounds a pure substance made up of two or more elements that are chemically combined.They can be broken down into elements again by chemical reactions. Element a pure substance made up of one type of particle that cannot be broken down into simpler parts by chemical means. Compounds can be broken down & Elements cant!
Energy can be used to un-combine the compound into the two individual elements again. The elements cannot be un-combined any further. The Classification of Matter Answers Elements include metals & non-metals
One way elements can be classified is to group them into two categories: Metals elements that are commonly solid at room temperature, shiny, malleable, ductile, & good conductors Non-Metals elements that can be solid, liquid, or gas at room temperature, dull, brittle, not ductile, & poor conductors Classifying metals & non-metals Examples of metals & non-metals Answers: