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Additional resources for Chemistry The Central Science
There could be more than one reasonable hypothesis. If a hypothesis is correct, then certain results and observations should follow from it. In this way hypotheses can stimulate the design of experiments to learn more about the system being studied. Scientific creativity comes into play in thinking of hypotheses that are fruitful in suggesting good experiments to do, ones that will shed new light on the nature of the system. As more information is gathered, the initial hypotheses get winnowed down.
The units used for scientific measurements are those of the metric system. The metric system, developed in France during the late eighteenth century, is used as the system of measurement in most countries. 15). A Closer Look The Scientific Method Where does scientific knowledge come from? How is it acquired? How do we know it is reliable? How do scientists add to it, or modify it? There is nothing mysterious about how scientists work. The first idea to keep in mind is that scientific knowledge is gained through observations of the natural world.
3 Properties of Matter We then consider different characteristics, or properties, used to characterize, identify, and separate substances, distinguishing between chemical and physical properties. 4 Units of Measurement We observe that many properties rely on quantitative measurements involving numbers and units. The units of measurement used throughout science are those of the metric system. 5 Uncertainty in Measurement We observe that the uncertainty inherent in all measured quantities is expressed by the number of significant figures used to report the quantity.