Elements, Compounds & Mixtures Chapter 22 Page 129

What is all matter made of? An atom is the smallest part of an element that still has the properties of that element

Elements An element is a substance which cannot be broken down into simpler substances by chemical means http://www.privatehand.com/flash/elements.html

It is made up of only one kind of atom Element It is made up of only one kind of atom

Compounds A compound is a formed when two or more elements combine together chemically

Hydrogen (H) + Oxygen (O) Examples of Compounds Compounds contain elements The elements combine + lose their original properties Compounds CAN be separated by chemical means The elements combine in fixed ratios A compound is a completely new substance with its own properties Sodium (Na) + Chlorine (Cl) NaCl Hydrogen (H) + Oxygen (O) H2O Carbon (C) + Oxygen (O) CO2

Mixtures A mixture consists of two or more different substances mingled together but not chemically combined

Examples of Mixtures Properties of Mixtures: chicken noodle soup salad pizza – yes, that would be Yoda… Properties of Mixtures: Each substance in a mixture keeps its identity You can physically separate them They also contain elements, compounds, or both And they can be formed using any ratio of components

Differences between Mixtures and Compounds Consist of a single substance The elements in a compound is always in a fixed proportion The properties are very different to those of the elements used Very difficult to separate Consist of two or more substances The proportion of each substance in the mixture does not matter The properties are the same as those of the substances used Usually easy to seperate

Identify the following with as many terms as apply Table salt Salad Mayonnaise Italian dressing Pepsi Oxygen Hydrogen Water Mixture Element Compound

Solutions Chapter 23 – Page 136