C&EN Physical Chemistry

The chemistry of snow and ice

Why do snowflakes have six sides? Why does ice float on water? Is every snowflake unique? This month’s edition of Periodic Graphics in Chemical & Engineering News looks at the answers to these questions and more! Click here to view the full graphic.

Atmospheric Chemistry Chemistry History

Today in Chemistry History: Susan Solomon, ozone depletion, and CFCs

Susan Solomon’s work led to confirmation that chlorine-containing compounds can deplete ozone. In particular, she explained why this depletion was focused over the poles. This graphic looks at how ozone depletion happens. Below, we’ll look in more detail at Solomon’s contributions.