3. Exit Chapter Menu Introduction to Chemistry Topic 1.1Topic 1.1What is Chemistry? Topic 1.2Topic 1.2 Matter Topic 1.3Topic 1.3 Scientific Methods Section 1.4Section 1.4 Scientific Research Click a hyperlink or folder tab to view the corresponding slides. Exit

4. Section 1-1 Section 1.1 Matter and Chemistry Chemistry Matter Substance Macroscopic Microscopic Submicroscopic mass weight Model Define substance. Explain what Chemistry is. Compare and contrast mass and weight. Explain why chemists are interested in a submicroscopic description of matter. Chemistry is the study of everything around us.

5. Section 1-1 Why Study Chemistry? All the “stuff” in the universe is made from building blocks that have been here since the beginning of the universe. These building blocks and everything made from them are called matter. Those original pieces of matter are still here. Chemistry is the study of matter and the changes it undergoes.Chemistry Everything around you involves Chemistry

6. Section 1-1 What is a substance? A substance is another name for a chemicalsubstance It is matter that has a definite composition. We will usually talk about PURE substances. 2 types of Pure substances– elements compounds Mixtures are not pure substances

7. Section 1-1 Where do we find Chemical reactions? EVERYWHERE! Most changes around you are the result of chemical reactions. EVERYTHING that happens in your body is a chemical reaction or an energy change. Later we will learn how to tell if something is a chemical reaction

8. Section 1-2 Matter and its Characteristics Matter has many different forms. Mass is a measurement that reflects the amount of matter.Mass Depends on the number of particles Weight is a measure of mass and the force of gravity on an object.Weight Weight can change from place to place, but mass is constant.

9. Section 1-2 Matter and its Characteristics (cont.) Much of matter and its behavior is macroscopic, meaning that it can be observed without a microscope. Microscopic observations requires a light microscope – like looking at cells The structure, composition, and behavior of all matter can also be described on the submicroscopic (atomic) level. An understanding of the SUBmicroscopic level can help explain and predict behavior of matter

10. Section 1-2 Chemistry explains events on the atomic (submicroscopic) level that cause macroscopic observations. A model is a verbal, visual, or mathematical explanation of experimental data.model Models are used to explain things that cannot be observed directly Since we can’t see things on a sub- microscopic level, we need models. Models often change as our understanding changes. Matter and its Characteristics (cont.)

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