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

Chemical Properties and Chemical Changes
Physical properties can be observed without changing the identity of
the substance, but properties of the second type—chemical properties—
cannot. 
A 
chemical property
 relates to a substance’s ability to undergo 
changes that transform it into different substances.
Chemical properties
are easiest to see when substances react to form new substances. 
For example, the ability of charcoal (carbon) to burn in air is a chemical 
property. When charcoal burns, it combines with oxygen in air to become 
carbon dioxide gas. After the chemical change, the amounts of the 
original substances, carbon and oxygen, are not less than before. They 
simply have recombined to form different substances with different 
properties. 
Figure 2.4
shows how a chemical property of a substance 
known as Benedict’s solution is used to test for sugars in urine.