WELCOME TO CHEMISTRY. With Dr. Wieser. Chapter 1 Section 1. Chemistry can be defined as the study of matter. Matter is anything that has mass and occupies space. So chemistry is the study of pretty much everything.
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With Dr. Wieser
A compound is a pure substance that is made of two or more elements that can be broken down into simpler substances.
Note that energy must be supplied to go from one state or phase to another:
In addition to phase changes matter can undergo other physical changes:
A physical property is one that describes a physical change. When considering phase changes, the melting point of a substance is a physical property. In the case of ice, this temperature is______oC.
The metric system is the one used in science. The units are called SI units-we will see that not all the units we will use are SI units.
Derived units: many measurements use more complicated units derived from the base units. For example volume (l x w x h) requires a cubic unit, if the measurements were in meters the unit would be m3.
The properties(chemical and physical) of compounds are unique and are totally different from the elements that make up the compound.