VOICEOVER: Pure and impure substances. The word pure in everyday life doesn't have the same meaning in science. For example, pure orange juice is a mixture of compounds and bottled water still has ...

Compounds are a second type of pure substance. Compounds always have the same ratio of elements. For example, Pyrite will always exist as one Fe atom for every two S atoms. Pure substances, which are ...

Let’s take chlorine as an example. It is positioned in group ... We also, confusingly, tend to refer to pure substances made of one kind of atom, like chlorine gas, as elements.

Originally limited to the study of compounds produced by living organisms, organic chemistry has been broadened to include human-made substances (e.g., plastics ... modify products for a specific use.

Pain starts with stress, and stress shows up at a cellular level. When humans and other lifeforms get stressed out, the ...

The differential behavior of the living and non-living membranes when the cell is placed in solutions of osmotically active substances ... The simplest illustration of Mendelianism is to be ...

Whereas scientists could only use natural uranium in a uranium machine, Heisenberg noted that they could use pure uranium 235 ... needed a moderator, a substance that would slow down the neutrons ...

It cannot, for example, use pure logic to discover the nature of dark matter, the mysterious substance that makes up 80 percent of matter in the universe. Instead it will have to rely on ...

Dairy milk delivered to your door in a glass bottle was a thing of the past for most. Then Bay Area-based Straus Family ...

“This is pure, 100% murder.” Houston was arrested on charges of manufacture or delivery of a controlled substance and ...

VOICEOVER: Pure and impure substances. The word pure in everyday life doesn't have the same meaning in science. For example, pure orange juice is a mixture of compounds and bottled water still has ...