chem.

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sodium metal is insoluble in ether.
sodium metal dissolves in water to produce a gas.
The copper bottom on a frying pan turns black after several heatings.
Are these physical or chemical changes..

  • chem. -

    Sodium metal is insoluble in ether - No change but technically you can call the sodium in ether an insoluble mixture and therefore a physical change.

    Sodium metal dissolves in water to produce a gas - You get a chemical change happening here because the sodium reacts with the water.

    The copper bottom on a frying pan turns black after several heatings - That's a chemical reaction forming copper (II) oxide so it's a chemical change.

  • chem. -

    physical or chemical property
    sodium metal fohrmhs an oxide when heated with oxygen?

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