HS-PS1-2

Construct and revise an explanation for the outcome of a simple chemical reaction based on the outermost electron states of atoms, trends in the periodic table, and knowledge of the patterns of chemical properties.

  1. Chemistry

    Explainer: Ocean acidification

    Here’s why shellfish and other animals in the sea suffer when the ocean is forced to absorb too much carbon dioxide.

    By Stephen Ornes
  2. Oceans

    Sea changes

    Carbon dioxide is making the oceans more acidic.

    By Stephen Ornes