The mole concept

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  • Science and engineering have dominated world events and world culture for at least 150 years. The blind and near blind have been made to see. The deaf and near deaf have been made to hear. The ill have been made well. The weak have been made strong. Radio, television and the internet have made the world seem smaller. And some of us have left the planet. Computers have played an essential role in all of these developments; they are now ubiquitous. These miraculous events happened by design— not by accident. Individuals and teams set out to accomplish goals.

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  • This approach does not ensure that students learn to solve problems and above all to think about the soluton process in a consistent manner. Topics such as atoms, molecules, and the mole concept are fundamental in chemistry and instructors may think that, for our students, should be easy to learn these concepts and to use them in solving problems, but it is not always so. If teachers do not put emphasis on the logical process during solving problems, students are at risk to become more profcient at applying the formulas rather than to reason.

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  • The International System of Units (SI) will be used throughout this book. Four basic quantities and their SI units are listed in Table 1-1. The other three basic quantities and corresponding SI units, not shown in the table, are temperature in degrees kelvin (K), amount of substance in moles (mol), and luminous intensity in candelas (cd).

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  • (bq) part 1 book "general, organic, and biological chemistry" has contents: basic concepts about matter, measurements in chemistry, atomic structure and the periodic table, chemical bonding the covalent bond model, chemical calculations - formula masses, moles, and chemical equations,...and other contents.

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  • (BQ) Part 1 of the document Evidence-Based dermatology presents the following contents: The concept of evidence-based dermatology, the critical appraisal toolbox, the evidence (common inflammatory skin diseases, skin cancer, moles, and actinic keratoses).

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