Online labs include: Mixture Separation Living in a Thirsty World Matter and Change Why it Matters

Atoms as Building 
Blocks 
Both elements 
and compounds are made 
of atoms, as shown in these 
models of diamond and
table sugar.
Figure 2.1
Carbon atom
Oxygen atom
Hydrogen atom
Carbon atom
(b) Sucrose (table sugar)
(a) Diamond
> 
Virginia
standards
CH.2.h
The student will investigate and 
understand that the placement of elements on 
the periodic table is a function of their atomic 
structure. The periodic table is a tool used for 
the investigations of: chemical and physical 
properties.
CH.2.EKS-14
; 
CH.2.EKS-15
6
Chapter 1
SEcTIon 2

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A 
compound
 is a substance that can be broken down into simple stable 
substances. Each compound is made from the atoms of two or more elements 
that are chemically bonded.
Sucrose, in 
Figure 2.1b,
is an example of a 
compound. It is made of three elements: carbon, hydrogen, and oxygen. 
The atoms are chemically bonded to form a molecule. You will learn 
more about the particles that make up compounds when you study 
chemical bonding. For now, you can think of a 
molecule
as the smallest 
unit of an element or compound that retains all of the properties of that 
element or compound.
Main idea