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

    Chemistry’s ever-useful periodic table celebrates a big birthday

    2019 is the International Year of the Periodic Table. But the traditional chart is just one of many shapes that chemists and other scientists have developed to organize the elements.

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  2. Chemistry

    Explainer: What are acids and bases?

    These chemistry terms tell us if a molecule is more likely to give up a proton or pick up a new one.

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  3. Climate

    Explainer: The making of a snowflake

    Have you ever wondered how a snowflake gets its shape?

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  4. Earth

    Explainer: Why sea levels aren’t rising at the same rate globally

    The ocean is rising all over the world. The rise seems speedier in some places. What gives? Many factors, it turns out, affect where — and why — the tide gets high.

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  5. Chemistry

    Explainer: CO2 and other greenhouse gases

    Carbon dioxide is just one of several chemicals that contribute to the greenhouse effect. Nitrous oxide, methane and CFCs are other big contributors.

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  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.

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  7. Chemistry

    Explainer: What is a catalyst?

    Catalysts are used in manufacturing and many technologies. They’re also found in living things. They help chemical reactions move along.

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  8. Tech

    How to spin synthetic spider silk

    A new method for spinning artificial spider silk combines parts of proteins from two species and mimics what happens in a spider’s silk-forming gland.

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  9. Computing

    How to build computer chips only 3 atoms thick

    Scientists have engineered an ultrathin material only three atoms thick. The material could be used to make extremely slender computer chips.

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  10. 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.

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  11. Tech

    Clear, stretchy sensor could lead to wearable electronics

    Researchers have combined plastics and metal to make a transparent, stretchable sensor. It could soon find use in touchscreens, wearable electronics and more.

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  12. Chemistry

    Scientists Say: Acidification

    When a solution becomes more acidic, it’s acidifying. And that’s not always a good thing.

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