Chemistry — Introduction to Chemistry and States of Matter + 4 more topics

Chemistry is often called the "central science" because it connects so many other fields like biology, physics, and geology. At its heart, chemistry is about understanding matter and its changes.

Matter is anything that has mass and occupies space. This means pretty much everything you can touch, see, or even just detect (like air!).

We can classify matter in a couple of ways:

When substances are mixed but not chemically joined, they form a mixture. Think of salt dissolved in water – it's still salt and still water, just mixed. To separate them, we use various techniques that take advantage of differences in their physical properties.

Here are some common ways we separate mixtures: