This document discusses the classification of matter. It explains that scientists classify matter based on its composition and whether it is uniform throughout. There are three main types of matter: mixtures, elements, and compounds. Mixtures are two or more substances that are not chemically combined and can be separated physically. Elements are the simplest pure substances that cannot be broken down further. Compounds are pure substances made of two or more elements that can be broken down chemically into simpler substances.

1. A Matter of Fact Mixtures, Elements and Compounds

10. Granite is a heterogeneous mixture .

15. Examples of homogeneous mixtures Milk, toothpaste, and mayonnaise are homogeneous mixtures. They are also colloids.

21. Ocean water is a solution

22. The universal solvent: Water

24. Types of solutions Solute Solvent Example Metals dissolved in metals are called alloys. Gas Gas Air (oxygen in nitrogen) Gas Liquid Soda water (carbon dioxide in water) Solid Liquid Ocean water (salt in water) Solid Solid Gold jewelry (copper in gold)

25. Air is a solution of oxygen and other gases dissolved in nitrogen

26. Alloys Brass is an alloy of copper and zinc. Stainless steel is a mixture of iron and chromium.

32. Common Elements Aluminum Al Bromine Br Calcium Ca Carbon C Gold Au Helium He Hydrogen H Nitrogen N