Che 131 Notes Ch. 1

Che 131 Notes Ch. 1 - Sarah Song 105852335 Che 131 Notes...

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Sarah Song 105852335 Che 131 Notes Chapter 1: The Nature of Chemistry Lecture 2: Physical and Chemical Properties of Matter Reading 1.1-1.5 I. 1.1 Why Care about Chemistry? A. Chemistry : the science of matter and its transformations from one form to another. B. Matter : anything that has mass and occupies space. II. 1.3 How Science Is Done A. Hypothesis : an idea that is tentatively proposed as an explanation for some observation and provides a basis for experimentation B. Qualitative data: not involving numeric data C. Quantitative data: obtained from measurements that produce numeric data D. Scientific law : statement that summarizes and explains a wide range of experimental results and has not been contradicted by experiments 1. capable of predicting unknown results and of being disproved or falsified by new experiments E. Theory : unifying principle that explains a body of facts and the laws based on them F. Model : makes a theory more concrete III. 1.4 Identifying Matter: Physical Properties A. Substance : a type of matter that has the same properties and the same composition throughout a sample 1. each substance has characteristic properties that are different from the properties of any other substance 2. one sample of a substance has the same composition as every other sample of that substance B. Physical properties : properties that can be observed and measured without changing the composition of a substance C. Physical change : changes in the physical properties of a substance 1. the same substance is present before and after a physical change, but the substance’s physical state or the gross size and shape of its pieces may have changed a. i.e. temperature, pressure, shape changes IV. 1.5 Chemical Changes and Chemical Properties A. Chemical changes/ reactions : one or more reactants are transformed into one ore more different products B. Chemical properties : describe the kinds of chemical reactions a substance can undergo C. Energy : the capacity to do work
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Sarah Song 105852335 Che131 R18 HW Chapter 1.1 – 1.5 11. Make a list of at least four issues faced by our society that require scientific studies and scientific data before a democratic society can make informed, rational decisions. Pollution and alternative sources of energy, virus synthesis, cloning, effect of pesticides 18. Which temperature is higher? a) 20 ºC or 20 ºF 20 ºC b) 100 ºC or 180 ºF 100 ºC c) 60 ºC or 100 ºF 60 ºC d) -12 ºC or 20 ºF 20 ºF 20. The following temperatures are measured at various locations during the same day in the winter in North America: -10 ºC at Montreal, 28 ºF at Chicago, 20 ºC at Charlotte, and 40 ºF at Philadelphia. Which city is the warmest? Which city is the coldest? The warmest city is Charlotte and the coldest is Montreal.
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Che 131 Notes Ch. 1 - Sarah Song 105852335 Che 131 Notes...

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