Chapter 1 - Chapter 1: Chemistry: Matter and Measurement...

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Chapter 1: Chemistry: Matter and Measurement 1 Observation and Experimentation If you have the results of many experiments it can explain them with hypothesis . The hypothesis can make more predictions until an overall explanation is reached. This is a theory . (tell story of scurvy and lemons aboard British ships to illustrate difference between hypothesis and theory) Some Terms: Matter – anything that has mass and occupies space Element – An element is a substance that can’t be broken down any further into another substance. They are the basic building blocks of all substances. These elements are listed in the periodic table . Atom – on the microscopic scale, smallest “indivisible” unit in a sample of matter Molecule – larger unit made up of 2 or more atoms Composition – the types of atoms or molecules and the ratios of these types in a sample (It’s what makes up the sample on the microscopic level.) Properties : Physical properties – a property of a sample that can be observed without a change in its composition. Chemical properties – properties of a sample that are observed and accompanied by a change in its composition. Changes : Physical change – a change in sample that does not change composition of sample Chemical change – a change in sample that does change composition of sample Classification of Matter Pure Substance – fixed composition, uniform throughout Mixture – no fixed composition Element – can’t be broken down further into another substance, on periodic table Compound – combination of 2 or more elements, can be broken down into other substances (elements) Homogeneous Mixture – mixture that is uniform throughout Heterogeneous Mixture – mixture that is not uniform throughout (Give examples of each.)
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Chapter 1: Chemistry: Matter and Measurement 2 Experimentation and Measurement Measurement need numbers; start off by looking at ways to express numbers
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Chapter 1 - Chapter 1: Chemistry: Matter and Measurement...

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