Analyze and interpret data on the properties of substances before and after the substances interact to determine if a chemical reaction has occurred.

  1. Environment

    Trees can make summer ozone levels much worse

    The greenery can release chemicals into the air that react with combustion pollutants to make ozone. And trees release more of those chemicals where it gets really hot, a new study finds.

  2. Chemistry

    BPA-free plastic may host BPA-like chemical, teen finds

    Something has to replace the BPA in ‘BPA-free’ plastics. A teen has been probing what that is.

  3. Health & Medicine

    This mix turns pink when sunscreen wears thin

    Many people know to put on sunscreen. Remembering to put more on is harder. A teen invented an indicator that glows pink when it’s time to reapply.

  4. Physics

    After 30 years, this supernova is still sharing secrets

    It’s been 30 years since astronomers first witnessed the stellar explosion known as SN 1987A. Today, researchers are still learning from this cataclysmic phenomenon.

  5. Planets

    How Earth got its moon

    How did our moon form? Scientists are still debating the answer. It may be the result of some one big impact with Earth — or perhaps many small ones.

  6. Animals

    Cool Jobs: A world aglow

    Three scientists probe how the natural world makes light, in hopes of using this information to design new and better products.

  7. Physics

    Explainer: How batteries and capacitors differ

    Both batteries and capacitors can power electronic devices. Each, however, has different properties which may provide benefits — or limitations.

  8. Computing

    LEDs offer new way to kill germs in water

    Growing ultraviolet-light-emitting diodes on thin, flexible sheets of metal holds promise for water disinfection and other applications.

  9. Chemistry

    Scientists Say: Unsaturated fat

    These fats are found in foods like olive oil. It’s their special bonds that make them go with the flow.

  10. Teen prints a device to help keep wounds dry

    A Broadcom MASTERS finalist invented a sensor that goes off when a wound is too wet. This would alert a patient it’s time to change their bandage.

  11. Environment

    Vaping may put your smile at risk

    As e-cigarette use among teens rises, scientists find that vaping may cause cellular damage to the mouth, gums and teeth. Even the cells’ DNA was affected.

  12. Environment

    Something in plastics may be weakening kids’ teeth

    The body can confuse some pollutants for a natural hormone. Researchers in France now find such pollutant exposures in childhood may lead cells to make defective tooth enamel.