Chapter 1 Chemistry Notes

Chapter 1 Chemistry Notes - Ch 1 1.1 Vocabulary...

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Ch. 1  1.1  Vocabulary  Observations  – Describe and measure some event in nature.  Data –Observations based on measurements.  Scientific Method  1. Observations  – Describe and measure some event in nature.  2. Hypothesis – States a possible interpretation of the observations. It must be stated in a  way that can be tested by experiments.  3. Experiments – Tests that determine the validity of the hypothesis.  4. Theory – When experiments can be repeated by many scientists with consistent results  that confirm the hypothesis, the hypothesis becomes this.  1.2 Vocabulary  Metric System – Used by scientists and health professionals throughout the world.  System of Units (SI)  – Adopted by scientists to provide uniformity for uniformity for units used in  sciences.  Meter  – Metric and SI unit of length.  Volume  – The amount of space a substance occupies.  Liter (L)  – Com monly used to measure volume.  Mass  – A measure of the quantity of material it contains.  Weight – The measure of the gravitational pull on an object.
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Measurement and Scientific Notation  The metric system is used by scientists and health professionals throughout the world.  The common measuring system in most countries.  International System of Units (SI) was adopted by scientists to provide uniformity for uniformity for units used in  sciences.  Length  The metric and SI unit for length is the meter (m).  The cm is more occasionally used.  Volume  Volume is the amount of space a substance occupies. A liter (L) is commonly used to measure volume. Milliliter (mL) is more convenient for measuring smaller volumes of fluids. Mass  The  mass of an object is a measure of the quantity of material it contains. Weight is the measure of the gravitational pull on an object.
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