August 25, August 27, August 21, July 6, November 7, Related Articles. Share your views. Leave a Reply Cancel reply You must be logged in to post a comment. Close Search for. In what region of the electromagnetic spectrum do these wavelengths lie? After 82 minutes, the pressure in the container is 0.
Find the half-life of the nuclide. Hydrogen and methanol have both been proposed as alternatives to hydrocarbon fuels. Write balanced reactions for the complete combustion of hydrogen and methanol and use standard enthalpies of formation to calculate the amount of heat released per kilogram of the fuel. Which fuel contains the most energy in the least mass?
How does the energy of these fuels compare to that of octane C 8 H 18? Tro is a good book for students taking general chemistry courses. A molecular approach to learning chemistry is the study of the behavior of matter, as determined by the properties of molecules and atoms and their molecular arrangement.
The material in this book is well laid out and organized with key terms given at the end of each chapter to help students easily locate the different terms in the lesson. Key Concepts give a summary of important concepts in the chapters. Formula and relationships are given in Key Equation and Relationships. The media package helps students learn concepts with the help of the activities given.
Concepts and theories are well explained with relevant pictorial data. For example, chemical bonding is supported with relevant pictures and tables in chapters 9 and Zooming in on a portion of a figure, as given on page 10, is a very useful feature of this book that helps improve readability and understanding. It makes it easier for students to visualize chemical bonding in constituent particles of matter. The first is intrinsic: through an understanding of chemistry, you gain a powerful appreciation for just how rich and extraordinary the world really is.
The second reason is extrinsic: understanding chemistry makes you a more informed citizen—it allows you to engage with many of the issues of our day. In other words, understanding chemistry makes you a deeper and richer person and makes your country and the world a better place to live. These reasons have been the foundation of education from the very beginnings of civilization. How does chemistry help prepare you for a rich life and conscientious citizenship?
Let me explain with two examples. My first one comes from the very first page of Chapter 1 of this book. There, I ask the following question: What is the most important idea in all of scientific knowledge?
My answer to that question is this: the behavior of matter is determined by the properties of molecules and atoms. That simple statement is the reason I love chemistry. We humans have been able to study the substances that compose the world around us and explain their behavior by reference to particles so small that they can hardly be imagined. If you have never realized the remarkable dependence of the world we can see on the world we cannot, you have missed out on a fundamental truth about our universe.
To have never encountered this truth is like never having read a play by Shakespeare or seen a sculpture by Michelangelo—or, for that matter, like never having discovered that the world is round. It robs you of an amazing and unforgettable experience of the world and the human ability to understand it.
My second example demonstrates how science literacy helps you to be a better citizen. Although I am largely sympathetic to the environmental movement, a lack of science literacy within some sectors of that movement and the resulting anti-environmental backlash create confusion that impedes real progress and opens the door to what could be misinformed policies.
For example, I have heard conservative pundits say that volcanoes emit more carbon dioxide—the most significant greenhouse gas—than does petroleum combustion. I have also heard a liberal environmentalist say that we have to stop using hair spray because it is causing holes in the ozone layer that will lead to global warming. Well, the claim about volcanoes emitting more carbon dioxide than petroleum combustion can be refuted by the basic tools you will learn to use in Chapter 4 of this book.
As for hair spray depleting the ozone layer and thereby leading to global warming, the chlorofluorocarbons that deplete ozone have been banned from hair spray since , and ozone depletion has nothing to do with global warming anyway. People with special interests or axes to grind can conveniently distort the truth before an ill-informed public, which is why we all need to be knowledgeable.
So this is why I think you should take this course. Not just to satisfy the requirement for your major and not just to get a good job some day, but to help you to lead a fuller life and to make the world a little better for everyone. I wish you the best as you embark on the journey to understanding the world around you at the molecular level. The rewards are well worth the effort.
To the Professor First and foremost, thanks to all of you who adopted this book in its previous editions. You helped to make this book one of the most popular general chemistry textbooks in the world.
I am grateful beyond words. Second, I have listened carefully to your feedback on the previous edition. The changes you see in this edition are the direct result of your input, as well as my own experience using the book in my general chemistry courses. If you have reviewed content or have contacted me directly, you will likely see your suggestions reflected in the changes I have made. Thank you. Higher education in science is changing.
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