Chemistry - the science concerned with the composition of matter and with the changes that matter undergoes. - is the study of matter and the changes it can undergo. - the organization of experimental results into laws, the development of a molecular model and finally the coupling of these components so that our physical world can be further explored or mastered. - the science that deals with the composition, structure and properties of matter and the changes that matter undergoes.

Red blood cells

Hemoglobin ( a tetrameric protein)

The “heme” part of hemoglobin

Protein Data Bank - An Information Portal to Biological Macromolecular Structures (PDB:1C7D)

Problem 1.1 For each image in Fig. 1.1, identify what class of pure substance is depicted (element or compound) and identify the physical state(s).

Problem Solving Strategy  What general type of problem is it?  What are the chemical concepts involved?  Is it qualitative or quantitative? Is there an equation I can use? What units are involved?

Problem 1.4 How would you describe the change depicted in Fig. 1.4?

Problem 1.5 A space filling model of methanol is shown in Fig What is the chemical formula of methanol?

Problem 1.6 A ball-and-stick model of acetone is shown in Fig What is the chemical formula of acetone?

Problem 1.14 Gasohol is a fuel that contains ethanol dissolved in gasoline. Is gasohol a heterogeneous mixture or a homogeneous mixture?

Your Turn ……