Chapter 1 Matter, Measurements, & Calculations 1.1 What Is Matter? Copyright © 2005 by Pearson Education, Inc. Publishing as Benjamin Cummings

Matter Matter is the “stuff” that makes up all things and is too small to be seen with the human eye. Copyright © 2005 by Pearson Education, Inc. Publishing as Benjamin Cummings Anything that has mass and occupies space is matter.

Mass is a measurement of the amount of matter in an object. Ex. A bowling ball vs. a basket ball Weight is a measurement of the gravitational force acting on an object. Ex. Dropping a bowling ball vs. a feather Mass vs. Weight

Pile of unorganized Legos Credit: Courtesy of Julie Millard

Molecules, like these Legos, can be combined in different ways Credit: Courtesy of Julie Millard

Molecules, like these Legos, can be combined in different ways Credit: Courtesy of Julie Millard

Chemical compounds are pure substances made of atoms of different elements combined in a definite, fixed ratios. Ex. Water will have the same property no matter where it comes from. A molecule is the smallest chemical unit of a compound that retains the composition and properties of the compound and can exist independently. Ex. 2H’s and 1O