Elements, Mixtures, and Compounds
- Pure Substance- a sample of matter, either a single element or a single compound, that has definite chemical and physical properties.
- Element- a substance that cannot be separated or broken down into simpler substances by chemical means
- Elements can be identified by its unique set of properties. Some properties that they can be identified by is melting point, density, color, hardness, and texture.
- Elements are also grouped into categories by the properties they share. There are three major categories metals, nonmetals, and metalloids. Metals are shiny, and they conduct heat energy and electric current. Nonmetals do not conduct heat or electric current, and are dull in appearance.
- Elements make up compounds because a compound is a group of elements that are chemically combined.
- Some properties of a compound are melting point, density, and color.
- Compounds can be broken down into their elements by chemical changes. For example, carbonic acid breaks down into carbon dioxide and water.
- Some common compounds are marble, bleach, baking soda and much more.
- A mixture can be broken down into different substances by separating the different substances in the mixture. For example if you don't like mushrooms on your pizza you can just pick them off your pizza.