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CHM131 Chpt 1

CHM131 Chpt 1 - Chapter One 1.1 Chemistry An Overview is...

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Chapter One: 1.1 Chemistry: An Overview 0. ____________ is the study of the composition, structure, properties, and reactions of matter. 0. It is the science that deals with every kind of matter, from the tiniest parts of atoms to the most complex materials of living plants and animals. 1. __________ is all the substances that make up our world. It is anything that has mass which mean that if you can weigh it, it is ________. Chemistry Directly Affects Our Lives 0. Chemistry happens all around you every day and has a big impact on everything you use and do. 1. Examples Diagrams for the following on pages 3 and 4 Atoms vs. Molecules Oxygen and Hydrogen Molecules A Chemical Reaction 1.2 The Scientific Method 2. A set of general principles that describes the thinking of a scientist. 0. ________________- observe, describe, and measure some event in nature (data). 0. May be quantitative (called a ________________, involves both a __________ and a ________) 1. May be qualitative (does not involve a __________) 2. ________________- states a possible interpretation of the observations that can be tested by experiments. (Guesses) 3. _________________- tests that determine the validity of the hypothesis. 4. _________________- represents the best explanations for various phenomena as of today, but are always tentative. The Various Parts of the Scientific Method Figure 1.4 Law vs. Theory 3. A ________________ summarizes what happens. It is a summary of observed (measurable) behavior. 0. Example: Law of conservation of mass = observation that the total mass of materials is not affected by a chemical change in those materials 4. A ________________ is an attempt to explain why it happens. It is an explanation of behavior. 1.3 Units of Measurement 2. Measurement - quantitative observation consisting of 2 parts 0. Part 1 –
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Part 2 – 3. Examples: 4. Metric system= system of standards for observations 5. SI system (international system) = used in science 0. Based on the _________ system and units derived from the metric system 1. ________ are used in the SI system to change the size of the unit. 2. Table 1.2 pg 9 Know the prefixes in Blue Learning Check Conveniently, a U.S. nickel has a mass of approximately 5 grams. If you had one dollar’s worth of nickels what would be the mass of the nickels in milligrams? 1. 100 milligrams 2. 50 milligrams 3. 1,000 milligrams 4. 100,000 milligrams Table 1.1 The Fundamental SI Units Physical Quantity Name of Unit Abbreviation Mass kilogram kg Length meter m Time second s Temperature kelvin K Electric current ampere A Amount of substance mole mol Luminous intensity candela cd Volume 6. Is the ____________________ by a substance 7. Is not fundamental _________, but derived from length 8. 1cm 3 = 1mL The mass of an object 2. Is the ______________ of the material it contains 3. SI unit ________________ 1.4 Uncertainty in Measurement 9. A digit that must be estimated is called uncertain. 10. A measurement always has some degree of uncertainty.
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CHM131 Chpt 1 - Chapter One 1.1 Chemistry An Overview is...

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