Chemistry Chapter 1

a kind of matter that can be seperated by physical means into other kinds of matter.

• homogeneous: non-uniform throughout
• heterogeneous: uniform throughout.

A LAW IS A CONCISE STATEMENT OR MATHEMATICAL EQUATION DESCRIBING A FUNDAMENTAL RELATIONSHIP OR REGULARITY OF NATURE does not OFFER AN EXPLANATION, WHILE A THEORY IS A TESTED EXPLANATION, CANNOT BE PROVE, AND MAY BE MODIFIED.

The total mass remains constand during a chemical change (reaction) because mass cannot be created or destroyed.

the CLOSENESS to the set of calues obtained from repeated measurement of the same quantity. Not neccessarily accurate.

the closeness of a single measurement to its true value.

10^6

10^3

10^-1

10^-2

10^-2

10^-6

10^-9

10^-10

the measure of "hotness". It is related to how energetic the molecules are in a particular sample.

A quantity of energy transferred in a chemical reaction. Heat flows from an area of high temp. to an area od lower temp.

C + 273.15K = C

F = (C x 1.8) +32F

C= F - 32F / 1.8

C = (K-273.15K)

a notation that uses atomic symbols with numerical subscripts to convey the relative proportions of atoms of elements uin a substance.

a definite group of atoms that are chemically bonded together.

a formula giving the exact number of different atoms iof an atoms in a molecule.

electrically charged particle obtained from an atom or group of atoms by adding or removing one or more electrons.