This standard states:
|I am able to categorize a sample of matter as one of the following:
To show the difference, I started out with some quick visual definitions:
An element is the purest form of matter. Anything that has it’s own spot on the periodic table of the elements is an element.
If two or more elements combine in a chemical reaction, they will form a new type of pure substance that has a distinct ratio of amounts one element to another.
Just because two elements are mixed together doesn’t mean that a compound has formed. There must be a chemical reaction that produces something completely new.
When two or more substances are placed together and don’t react chemically, the result is what we call a mixture. Sometimes, it’s obvious that what we have is a mixture, because we can see it by eye. Mixtures like this are called heterogeneous mixtures (“hetero-” = different):
Sometimes, the particles in the mixture are so small that we can’t really tell they are mixtures, unless we know for sure. These mixtures are called solutions or homogeneous mixtures (“homo-” = same). Homogeneous mixtures are easy to confuse with pure substances, just by looking at them:
Next, we looked at real life examples of these classes of matter.