1. Pure Substances and Mixtures – What Are They?

2. What is matter? Anything that takes up space and has mass Is your paper matter? YES!!

3. The Particle Theory In 400 B.C.E. Democritus stated that: ALL matter (solids, liquids and gases) is made up of tiny particles. THE FIRST PRINCIPLE!!

4. The Particle Theory of Matter 1.All matter is composed of very small particles 2.All the particles of matter are in constant motion 3. All particles of one substance are identical 4.Temperature affects the speed at which particles move 5.Particles attract each other

5. Vocabulary! Pure Substance – matter consisting of only one type of particle (e.g. distilled water, refined sugar) Mixture – matter consisting of more than one type of particle (e.g. air, tap water, granola). Mixtures can be divided into two categories: mechanical mixtures and solutions.

6. Mechanical Mixture – a mixture where individual particles can be identified (e.g. granola, concrete). Mechanical mixtures can be homogenous or heterogeneous. Homogeneous Mixture – a mixture where particles of each component substance are evenly dispersed Heterogeneous Mixture – a mixture where particles of each component substance are not evenly dispersed

7. Solution – a mixture where individual particles are interspersed homogeneously. Individual particles cannot be identified (e.g. air, tap water)

8. In your science binder, answer the following question: If I spray an air freshener on one side of the classroom, how do you think you are able to smell it on the other side of the classroom?