There are lots of different substances but only just over a hundred elements. An element is a substance that is made up of only one kind of atom. The atoms in a particular element are the same as each ...

Chemists use symbols and formulae to represent elements, ions and compounds. Chemical equations model the changes that happen in chemical reactions. The mole and Avogadro's constant - OCR Gateway What ...

Note: This video is designed to help the teacher better understand the lesson and is NOT intended to be shown to students. It includes observations and conclusions that students are meant to make on ...

Discover the fascinating chemistry that makes our world and everything in it—including us. Just about every solid, liquid, or gas in the world as we know it begins with reactions between individual ...

Note: This video is designed to help the teacher better understand the lesson and is NOT intended to be shown to students. It includes observations and conclusions that students are meant to make on ...

As any viewer of NOVA’s "Beyond the Elements" series can tell, host David Pogue had a blast exploring the wonderful world of chemistry and bringing it to millions of PBS viewers. But why should David ...