Chapter 1 Chemistry: An Introduction

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Presentation transcript:

Chapter 1 Chemistry: An Introduction

A. The Importance of Learning Chemistry Chemistry is important to everyone because chemistry occurs all around us in our daily lives. Chemistry “looks inside” ordinary objects to study how their components behave. Chemists develop new materials. Chemistry can produce new sources of energy. Chemistry can help to control diseases.

B. What Is Chemistry? * Chemistry is the science that deals with the materials of the universe and the changes that these materials undergo. The goal of chemistry is to connect the macroscopic world you live in to the microscopic world that makes it all work.

C. The Scientific Method * C. The Scientific Method The scientific method is a procedure for processing the information that flows from the world around us in which we: Make observations Formulate hypotheses Perform experiments

D. The Scientific Method

D. The Scientific Method * D. The Scientific Method Observations Are Not Theories An observation can be witnessed and recorded. A theory is an interpretation – a possible explanation of why something happens.

D. The Scientific Method * D. The Scientific Method Theories Do Not Become Laws A natural law is a summary of behavior. A theory is our attempt to explain why it happens.

* E. Observations Quantitative – Observation made by using numbers and/or measurements to describe. Qualitative – Observation made by using descriptive words.

F. Measurements * Precision – Reproducibility in measurement. (Coming up with the same results again & again) Accuracy – Closeness of measurement to the accepted value.

G. Strategies for Learning Chemistry Learn the vocabulary Try to understand the fundamental ideas Use trial and error to solve problems Practice, practice, practice!

G. Strategies for Learning Chemistry

H. Law of Conservation of Mass * H. Law of Conservation of Mass You cannot destroy or create substances in a chemical reaction. You simply change how they are arranged or appear.