1. What’s the “matter”?

2. What’s the matter? EVERYTHING! The stuff that makes up the world is called matter. The smallest unit of matter is the atom. There are currently 110 different types of atoms and an INFINITE amount of ways to combine these atoms. http://www.csmate.colostate.edu/cltw/cohortpages/viney/atomhistory.html

3. Classifying matter:

4. 1. Pure Substance: one kind of element or compound. 1. Element- one type of atom, there are 110 known elements. 2. Compound-two or more types of atoms, chemically combined. molecule: the smallest unit of an element or compound.

5. Classify me: Element- molecule of N 2 Compound- molecule of CO 2 Element- molecule of He AKA an atom of He Element- molecule of H 2 Compound-molecule of methane gas, CH 4 Elements- molecules of the atoms Ar, Ne, Kr, and Xe Element- molecule of O 2

6. 2. Mixtures: two or more pure substances mixed together. Homogeneous mixtures: the substances are mixed evenly. The different substances that make up the mixture cannot been seen separately without first using a separation technique. i.e. syrup, air, gasoline. Heterogeneous mixtures: the substances are not mixed evenly and can be seen as separate parts i.e. Italian dressing, concrete.

7. Quick lab: Take the paper, choose a marker, and make a nice, small, solid design about one half inch from the bottom of the paper. Place the paper into the beaker of water so that it is standing in the water with the color near closer to the water than to the top of the beaker. Let the paper sit in the water while we continue to take notes.

8. 2. Mixtures: two or more pure substances mixed together. Mixture 1. Reflects the properties of the substances it contains. 2. Elements are physically mixed together. 3. A mixtures can be made with different proportions of ingredients. Compound 1. Has properties unique to the compound, and often different than the properties of the elements that make up the compound. 2. Elements are chemical bonded together. 3. A compound is always made up of the same ratio of elements.

9. 2. Mixtures: two or more pure substances mixed together. A major task in chemistry is the separation of mixtures. Filtration Chromatography Magnetism Distillation Refining

10. Quick lab: Chromatography Look at your mark. The dye in the marker is actually a __________ mixture of different dyes. Why is this not a compound? The liquid carried the different dyes different distances on the paper, allowing us to separate the mixture-this is called chromatography. What color of dyes make up the mixture for that specific marker? What other questions could you test this way? Homogeneous

11. Any questions?

12. Homework: 1. What is the difference between an element and compound? How are they similar? 2. What is the difference between a compound and a mixture? How are they similar?