美国高中化学教材一
25页1、 1 C:ChemistryXIUnit-1Unit-1(3)-Lay-4(reprint).pmd 27.7.6 (reprint) 1SOME BASIC CONCEPTS OF CHEMISTRY UNIT 1 After studying this unit, you will be able to understand and appreciate the role of chemistry in different spheres of life; explain the characteristics of three states of matter; classify different substances into elements, compounds and mixtures; define SI base units and list some commonly used prefixes; use scientific notations and perform simple mathematical operations on numbers; diff
2、erentiate between precision and accuracy; determine significant figures; convert physical quantities from one system of units to another; explain various laws of chemical combination; appreciate significance of atomic mass, average atomic mass, molecular mass and formula mass; describe the terms mole and molar mass; calculate the mass per cent of different elements constituting a compound; determine empirical formula and molecular formula for a compound from the given experimental data; perform
3、the stoichiometric calculations. SOME BASIC CONCEPTS OF CHEMISTRY Chemistry is the science of molecules and their transformations. It is the science not so much of the one hundred elements but of the infinite variety of molecules that may be built from them . Roald Hoffmann Chemistry deals with the composition, structure and properties of matter. These aspects can be best described and understood in terms of basic constituents of matter: atoms and molecules. That is why chemistry is called the s
4、cience of atoms and molecules. Can we see, weigh and perceive these entities? Is it possible to count the number of atoms and molecules in a given mass of matter and have a quantitative relationship between the mass and number of these particles (atoms and molecules)? We will like to answer some of these questions in this Unit. We would further describe how physical properties of matter can be quantitatively described using numerical values with suitable units. 1.1IMPORTANCE OF CHEMISTRY Science
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